Merge branch '30117-update-looks-job-log' into 'master'

Update looks job log

Closes #30117

See merge request !11663

10 files changed, 480 insertions, 483 deletions

diff --git a/app/assets/javascripts/build.js b/app/assets/javascripts/build.js
index 97f279e4be4..1a602cbd8a7 100644
--- a/app/assets/javascripts/build.js
+++ b/app/assets/javascripts/build.js
@@ -2,15 +2,11 @@
 consistent-return, prefer-rest-params */
 /* global Breakpoints */
 
+import _ from 'underscore';
 import { bytesToKiB } from './lib/utils/number_utils';
 
-const bind = function (fn, me) { return function () { return fn.apply(me, arguments); }; };
-const AUTO_SCROLL_OFFSET = 75;
-const DOWN_BUILD_TRACE = '#down-build-trace';
-
 window.Build = (function () {
   Build.timeout = null;
-
   Build.state = null;
 
   function Build(options) {
@@ -23,21 +19,22 @@ window.Build = (function () {
     this.buildStage = this.options.buildStage;
     this.$document = $(document);
     this.logBytes = 0;
+    this.scrollOffsetPadding = 30;
 
-    this.updateDropdown = bind(this.updateDropdown, this);
+    this.updateDropdown = this.updateDropdown.bind(this);
+    this.getBuildTrace = this.getBuildTrace.bind(this);
+    this.scrollToBottom = this.scrollToBottom.bind(this);
 
     this.$body = $('body');
     this.$buildTrace = $('#build-trace');
-    this.$autoScrollContainer = $('.autoscroll-container');
-    this.$autoScrollStatus = $('#autoscroll-status');
-    this.$autoScrollStatusText = this.$autoScrollStatus.find('.status-text');
-    this.$upBuildTrace = $('#up-build-trace');
-    this.$downBuildTrace = $(DOWN_BUILD_TRACE);
-    this.$scrollTopBtn = $('#scroll-top');
-    this.$scrollBottomBtn = $('#scroll-bottom');
     this.$buildRefreshAnimation = $('.js-build-refresh');
-    this.$buildScroll = $('#js-build-scroll');
     this.$truncatedInfo = $('.js-truncated-info');
+    this.$buildTraceOutput = $('.js-build-output');
+    this.$scrollContainer = $('.js-scroll-container');
+
+    // Scroll controllers
+    this.$scrollTopBtn = $('.js-scroll-up');
+    this.$scrollBottomBtn = $('.js-scroll-down');
 
     clearTimeout(Build.timeout);
     // Init breakpoint checker
@@ -56,54 +53,149 @@ window.Build = (function () {
       .off('click', '.stage-item')
       .on('click', '.stage-item', this.updateDropdown);
 
-    this.$document.on('scroll', this.initScrollMonitor.bind(this));
+    // add event listeners to the scroll buttons
+    this.$scrollTopBtn
+      .off('click')
+      .on('click', this.scrollToTop.bind(this));
+
+    this.$scrollBottomBtn
+      .off('click')
+      .on('click', this.scrollToBottom.bind(this));
 
     $(window)
       .off('resize.build')
       .on('resize.build', this.sidebarOnResize.bind(this));
 
-    $('a', this.$buildScroll)
-      .off('click.stepTrace')
-      .on('click.stepTrace', this.stepTrace);
-
     this.updateArtifactRemoveDate();
-    this.initScrollButtonAffix();
-    this.invokeBuildTrace();
+
+    // eslint-disable-next-line
+    this.getBuildTrace()
+      .then(() => this.makeTraceScrollable())
+      .then(() => this.scrollToBottom());
+
+    this.verifyTopPosition();
   }
 
+  Build.prototype.makeTraceScrollable = function () {
+    this.$scrollContainer.niceScroll({
+      cursorcolor: '#fff',
+      cursoropacitymin: 1,
+      cursorwidth: '3px',
+      railpadding: { top: 5, bottom: 5, right: 5 },
+    });
+
+    this.$scrollContainer.on('scroll', _.throttle(this.toggleScroll.bind(this), 100));
+
+    this.toggleScroll();
+  };
+
+  Build.prototype.canScroll = function () {
+    return (this.$scrollContainer.prop('scrollHeight') - this.scrollOffsetPadding) > this.$scrollContainer.height();
+  };
+
+  /**
+   * |                          | Up       | Down     |
+   * |--------------------------|----------|----------|
+   * | on scroll bottom         | active   | disabled |
+   * | on scroll top            | disabled | active   |
+   * | no scroll                | disabled | disabled |
+   * | on.('scroll') is on top  | disabled | active   |
+   * | on('scroll) is on bottom | active   | disabled |
+   *
+   */
+  Build.prototype.toggleScroll = function () {
+    const bottomScroll = this.$scrollContainer.scrollTop() +
+      this.scrollOffsetPadding +
+      this.$scrollContainer.height();
+
+    if (this.canScroll()) {
+      if (this.$scrollContainer.scrollTop() === 0) {
+        this.toggleDisableButton(this.$scrollTopBtn, true);
+        this.toggleDisableButton(this.$scrollBottomBtn, false);
+      } else if (bottomScroll === this.$scrollContainer.prop('scrollHeight')) {
+        this.toggleDisableButton(this.$scrollTopBtn, false);
+        this.toggleDisableButton(this.$scrollBottomBtn, true);
+      } else {
+        this.toggleDisableButton(this.$scrollTopBtn, false);
+        this.toggleDisableButton(this.$scrollBottomBtn, false);
+      }
+    }
+  };
+
+  Build.prototype.scrollToTop = function () {
+    this.$scrollContainer.getNiceScroll(0).doScrollTop(0);
+    this.toggleScroll();
+  };
+
+  Build.prototype.scrollToBottom = function () {
+    this.$scrollContainer.getNiceScroll(0).doScrollTo(this.$scrollContainer.prop('scrollHeight'));
+    this.toggleScroll();
+  };
+
+  Build.prototype.toggleDisableButton = function ($button, disable) {
+    if (disable && $button.prop('disabled')) return;
+    $button.prop('disabled', disable);
+  };
+
+  Build.prototype.toggleScrollAnimation = function (toggle) {
+    this.$scrollBottomBtn.toggleClass('animate', toggle);
+  };
+
+  /**
+   * Build trace top position depends on the space ocupied by the elments rendered before
+   */
+  Build.prototype.verifyTopPosition = function () {
+    const $buildPage = $('.build-page');
+
+    const $header = $('.build-header', $buildPage);
+    const $runnersStuck = $('.js-build-stuck', $buildPage);
+    const $startsEnvironment = $('.js-environment-container', $buildPage);
+    const $erased = $('.js-build-erased', $buildPage);
+
+    let topPostion = 168;
+
+    if ($header) {
+      topPostion += $header.outerHeight();
+    }
+
+    if ($runnersStuck) {
+      topPostion += $runnersStuck.outerHeight();
+    }
+
+    if ($startsEnvironment) {
+      topPostion += $startsEnvironment.outerHeight();
+    }
+
+    if ($erased) {
+      topPostion += $erased.outerHeight() + 10;
+    }
+
+    this.$buildTrace.css({
+      top: topPostion,
+    });
+  };
+
   Build.prototype.initSidebar = function () {
     this.$sidebar = $('.js-build-sidebar');
     this.$sidebar.niceScroll();
-    this.$document
-      .off('click', '.js-sidebar-build-toggle')
-      .on('click', '.js-sidebar-build-toggle', this.toggleSidebar);
-  };
-
-  Build.prototype.invokeBuildTrace = function () {
-    return this.getBuildTrace();
   };
 
   Build.prototype.getBuildTrace = function () {
     return $.ajax({
       url: `${this.pageUrl}/trace.json`,
-      dataType: 'json',
-      data: {
-        state: this.state,
-      },
-      success: ((log) => {
-        const $buildContainer = $('.js-build-output');
-
+      data: this.state,
+    })
+      .done((log) => {
         gl.utils.setCiStatusFavicon(`${this.pageUrl}/status.json`);
-
         if (log.state) {
           this.state = log.state;
         }
 
         if (log.append) {
-          $buildContainer.append(log.html);
+          this.$buildTraceOutput.append(log.html);
           this.logBytes += log.size;
         } else {
-          $buildContainer.html(log.html);
+          this.$buildTraceOutput.html(log.html);
           this.logBytes = log.size;
         }
 
@@ -114,141 +206,30 @@ window.Build = (function () {
           const size = bytesToKiB(this.logBytes);
           $('.js-truncated-info-size').html(`${size}`);
           this.$truncatedInfo.removeClass('hidden');
-          this.initAffixTruncatedInfo();
         } else {
           this.$truncatedInfo.addClass('hidden');
         }
 
-        this.checkAutoscroll();
-
         if (!log.complete) {
+          this.toggleScrollAnimation(true);
+
           Build.timeout = setTimeout(() => {
-            this.invokeBuildTrace();
+            //eslint-disable-next-line
+            this.getBuildTrace()
+              .then(() => this.scrollToBottom());
           }, 4000);
         } else {
           this.$buildRefreshAnimation.remove();
+          this.toggleScrollAnimation(false);
         }
 
         if (log.status !== this.buildStatus) {
-          let pageUrl = this.pageUrl;
-
-          if (this.$autoScrollStatus.data('state') === 'enabled') {
-            pageUrl += DOWN_BUILD_TRACE;
-          }
-
-          gl.utils.visitUrl(pageUrl);
+          gl.utils.visitUrl(this.pageUrl);
         }
-      }),
-      error: () => {
+      })
+      .fail(() => {
         this.$buildRefreshAnimation.remove();
-        return this.initScrollMonitor();
-      },
-    });
-  };
-
-  Build.prototype.checkAutoscroll = function () {
-    if (this.$autoScrollStatus.data('state') === 'enabled') {
-      return $('html,body').scrollTop(this.$buildTrace.height());
-    }
-
-    // Handle a situation where user started new build
-    // but never scrolled a page
-    if (!this.$scrollTopBtn.is(':visible') &&
-        !this.$scrollBottomBtn.is(':visible') &&
-        !gl.utils.isInViewport(this.$downBuildTrace.get(0))) {
-      this.$scrollBottomBtn.show();
-    }
-  };
-
-  Build.prototype.initScrollButtonAffix = function () {
-    // Hide everything initially
-    this.$scrollTopBtn.hide();
-    this.$scrollBottomBtn.hide();
-    this.$autoScrollContainer.hide();
-  };
-
-  // Page scroll listener to detect if user has scrolling page
-  // and handle following cases
-  // 1) User is at Top of Build Log;
-  //      - Hide Top Arrow button
-  //      - Show Bottom Arrow button
-  //      - Disable Autoscroll and hide indicator (when build is running)
-  // 2) User is at Bottom of Build Log;
-  //      - Show Top Arrow button
-  //      - Hide Bottom Arrow button
-  //      - Enable Autoscroll and show indicator (when build is running)
-  // 3) User is somewhere in middle of Build Log;
-  //      - Show Top Arrow button
-  //      - Show Bottom Arrow button
-  //      - Disable Autoscroll and hide indicator (when build is running)
-  Build.prototype.initScrollMonitor = function () {
-    if (!gl.utils.isInViewport(this.$upBuildTrace.get(0)) &&
-      !gl.utils.isInViewport(this.$downBuildTrace.get(0))) {
-      // User is somewhere in middle of Build Log
-
-      this.$scrollTopBtn.show();
-
-      if (this.buildStatus === 'success' || this.buildStatus === 'failed') { // Check if Build is completed
-        this.$scrollBottomBtn.show();
-      } else if (this.$buildRefreshAnimation.is(':visible') &&
-        !gl.utils.isInViewport(this.$buildRefreshAnimation.get(0))) {
-        this.$scrollBottomBtn.show();
-      } else {
-        this.$scrollBottomBtn.hide();
-      }
-
-      // Hide Autoscroll Status Indicator
-      if (this.$scrollBottomBtn.is(':visible')) {
-        this.$autoScrollContainer.hide();
-        this.$autoScrollStatusText.removeClass('animate');
-      } else {
-        this.$autoScrollContainer.css({
-          top: this.$body.outerHeight() - AUTO_SCROLL_OFFSET,
-        }).show();
-        this.$autoScrollStatusText.addClass('animate');
-      }
-    } else if (gl.utils.isInViewport(this.$upBuildTrace.get(0)) &&
-      !gl.utils.isInViewport(this.$downBuildTrace.get(0))) {
-      // User is at Top of Build Log
-
-      this.$scrollTopBtn.hide();
-      this.$scrollBottomBtn.show();
-
-      this.$autoScrollContainer.hide();
-      this.$autoScrollStatusText.removeClass('animate');
-    } else if ((!gl.utils.isInViewport(this.$upBuildTrace.get(0)) &&
-      gl.utils.isInViewport(this.$downBuildTrace.get(0))) ||
-      (this.$buildRefreshAnimation.is(':visible') &&
-      gl.utils.isInViewport(this.$buildRefreshAnimation.get(0)))) {
-      // User is at Bottom of Build Log
-
-      this.$scrollTopBtn.show();
-      this.$scrollBottomBtn.hide();
-
-      // Show and Reposition Autoscroll Status Indicator
-      this.$autoScrollContainer.css({
-        top: this.$body.outerHeight() - AUTO_SCROLL_OFFSET,
-      }).show();
-      this.$autoScrollStatusText.addClass('animate');
-    } else if (gl.utils.isInViewport(this.$upBuildTrace.get(0)) &&
-      gl.utils.isInViewport(this.$downBuildTrace.get(0))) {
-      // Build Log height is small
-
-      this.$scrollTopBtn.hide();
-      this.$scrollBottomBtn.hide();
-
-      // Hide Autoscroll Status Indicator
-      this.$autoScrollContainer.hide();
-      this.$autoScrollStatusText.removeClass('animate');
-    }
-
-    if (this.buildStatus === 'running' || this.buildStatus === 'pending') {
-      // Check if Refresh Animation is in Viewport and enable Autoscroll, disable otherwise.
-      this.$autoScrollStatus.data(
-        'state',
-        gl.utils.isInViewport(this.$buildRefreshAnimation.get(0)) ? 'enabled' : 'disabled',
-      );
-    }
+      });
   };
 
   Build.prototype.shouldHideSidebarForViewport = function () {
@@ -257,18 +238,23 @@ window.Build = (function () {
   };
 
   Build.prototype.toggleSidebar = function (shouldHide) {
-    const shouldShow = typeof shouldHide === 'boolean' ? !shouldHide : undefined;
+    const shouldShow = !shouldHide;
 
-    this.$buildScroll.toggleClass('sidebar-expanded', shouldShow)
+    this.$buildTrace
+      .toggleClass('sidebar-expanded', shouldShow)
       .toggleClass('sidebar-collapsed', shouldHide);
-    this.$truncatedInfo.toggleClass('sidebar-expanded', shouldShow)
-      .toggleClass('sidebar-collapsed', shouldHide);
-    this.$sidebar.toggleClass('right-sidebar-expanded', shouldShow)
+    this.$sidebar
+      .toggleClass('right-sidebar-expanded', shouldShow)
       .toggleClass('right-sidebar-collapsed', shouldHide);
   };
 
   Build.prototype.sidebarOnResize = function () {
     this.toggleSidebar(this.shouldHideSidebarForViewport());
+    this.verifyTopPosition();
+
+    if (this.$scrollContainer.getNiceScroll(0)) {
+      this.toggleScroll();
+    }
   };
 
   Build.prototype.sidebarOnClick = function () {
@@ -301,24 +287,5 @@ window.Build = (function () {
     this.populateJobs(stage);
   };
 
-  Build.prototype.stepTrace = function (e) {
-    e.preventDefault();
-
-    const $currentTarget = $(e.currentTarget);
-    $.scrollTo($currentTarget.attr('href'), {
-      offset: 0,
-    });
-  };
-
-  Build.prototype.initAffixTruncatedInfo = function () {
-    const offsetTop = this.$buildTrace.offset().top;
-
-    this.$truncatedInfo.affix({
-      offset: {
-        top: offsetTop,
-      },
-    });
-  };
-
   return Build;
 })();
diff --git a/app/assets/stylesheets/pages/builds.scss b/app/assets/stylesheets/pages/builds.scss
index 14a62b6cbf0..fefb53df648 100644
--- a/app/assets/stylesheets/pages/builds.scss
+++ b/app/assets/stylesheets/pages/builds.scss
@@ -29,129 +29,140 @@
   }
 }
 
-.build-page {
-  pre.trace {
-    background: $builds-trace-bg;
-    color: $white-light;
-    font-family: $monospace_font;
-    white-space: pre-wrap;
-    overflow: auto;
-    overflow-y: hidden;
-    font-size: 12px;
-
-    .fa-spinner {
-      font-size: 24px;
-      margin-left: 20px;
-    }
-  }
-
-  .environment-information {
-    background-color: $gray-light;
-    border: 1px solid $border-color;
-    padding: 12px $gl-padding;
-    border-radius: $border-radius-default;
+@keyframes blinking-scroll-button {
+  0% { opacity: 0.2; }
+  25% { opacity: 0.5; }
+  50% { opacity: 0.7; }
+  100% { opacity: 1; }
+}
 
-    svg {
-      position: relative;
-      top: 1px;
-      margin-right: 5px;
-    }
+.build-page {
+  .sticky {
+    position: absolute;
+    left: 0;
+    right: 0;
   }
 
-  .truncated-info {
-    text-align: center;
-    border-bottom: 1px solid;
-    background-color: $black;
-    height: 45px;
-    padding: 15px;
+  .build-trace-container {
+    position: absolute;
+    top: 225px;
+    left: 15px;
+    bottom: 10px;
+    background: $black;
+    color: $gray-darkest;
+    font-family: $monospace_font;
+    font-size: 12px;
 
-    &.affix {
-      top: 0;
+    &.sidebar-expanded {
+      right: 305px;
     }
 
-    // with sidebar
-    &.affix.sidebar-expanded {
-      right: 312px;
-      left: 22px;
+    &.sidebar-collapsed {
+      right: 16px;
     }
 
-    // without sidebar
-    &.affix.sidebar-collapsed {
-      right: 20px;
-      left: 20px;
+    code {
+      background: $black;
+      color: $gray-darkest;
     }
 
-    &.affix-top {
-      position: absolute;
+    .top-bar {
       top: 0;
-      margin: 0 auto;
-      right: 5px;
-      left: 5px;
-    }
+      height: 35px;
+      display: flex;
+      justify-content: flex-end;
+      border-bottom: 1px outset $white-light;
 
-    .truncated-info-size {
-      margin: 0 5px;
-    }
+      .truncated-info {
+        margin: 0 auto;
+        align-self: center;
 
-    .raw-link {
-      color: inherit;
-      margin-left: 5px;
-      text-decoration: underline;
+        .truncated-info-size {
+          margin: 0 5px;
+        }
+
+        .raw-link {
+          color: inherit;
+          margin-left: 5px;
+          text-decoration: underline;
+        }
+      }
     }
-  }
-}
 
-.scroll-controls {
-  height: 100%;
+    .controllers {
+      display: flex;
+      align-self: center;
+      font-size: 15px;
 
-  .scroll-step {
-    width: 31px;
-    margin: 0 0 0 auto;
-  }
+      svg {
+        height: 15px;
+        display: block;
+        fill: $white-light;
+      }
 
-  .scroll-link,
-  .autoscroll-container {
-    right: 25px;
-    z-index: 1;
-  }
+      a,
+      .btn-scroll {
+        margin: 0 8px;
+        color: $white-light;
+      }
 
-  .scroll-link {
-    position: fixed;
-    display: block;
-    margin-bottom: 10px;
+      .btn-scroll.animate {
+        .first-triangle {
+          animation: blinking-scroll-button 1s ease infinite;
+          animation-delay: .3s;
+        }
 
-    &.scroll-top .gitlab-icon-scroll-up-hover,
-    &.scroll-top:hover .gitlab-icon-scroll-up,
-    &.scroll-bottom .gitlab-icon-scroll-down-hover,
-    &.scroll-bottom:hover .gitlab-icon-scroll-down {
-      display: none;
-    }
+        .second-triangle {
+          animation: blinking-scroll-button 1s ease infinite;
+          animation-delay: .2s;
+        }
 
-    &.scroll-top:hover .gitlab-icon-scroll-up-hover,
-    &.scroll-bottom:hover .gitlab-icon-scroll-down-hover {
-      display: inline-block;
-    }
+        .third-triangle {
+          animation: blinking-scroll-button 1s ease infinite;
+        }
 
-    &.scroll-top {
-      top: 10px;
-    }
+        &:disabled {
+          opacity: 1;
+        }
+      }
 
-    &.scroll-bottom {
-      bottom: -2px;
+      .btn-scroll:disabled {
+        opacity: 0.35;
+        cursor: not-allowed;
+      }
     }
   }
 
-  .autoscroll-container {
-    position: absolute;
+  .bash {
+    top: 35px;
+    left: 10px;
+    bottom: 0;
+    overflow-y: hidden;
+    padding-bottom: 20px;
+    padding-right: 20px;
   }
 
-  &.sidebar-expanded {
+  .environment-information {
+    background-color: $gray-light;
+    border: 1px solid $border-color;
+    padding: 12px $gl-padding;
+    border-radius: $border-radius-default;
 
-    .scroll-link,
-    .autoscroll-container {
-      right: ($gutter_width + ($gl-padding * 2));
+    svg {
+      position: relative;
+      top: 1px;
+      margin-right: 5px;
     }
   }
+
+  .build-loader-animation {
+    position: relative;
+    width: 6px;
+    height: 6px;
+    margin: auto auto 12px 2px;
+    border-radius: 50%;
+    animation: blinking-dots 1s linear infinite;
+  }
 }
 
 .status-message {
@@ -223,32 +234,6 @@
   }
 }
 
-.build-trace {
-  background: $black;
-  color: $gray-darkest;
-  white-space: pre;
-  overflow-x: auto;
-  font-size: 12px;
-  position: relative;
-
-  .fa-spinner {
-    font-size: 24px;
-  }
-
-  .bash {
-    display: block;
-  }
-
-  .build-loader-animation {
-    position: relative;
-    width: 6px;
-    height: 6px;
-    margin: auto auto 12px 2px;
-    border-radius: 50%;
-    animation: blinking-dots 1s linear infinite;
-  }
-}
-
 .right-sidebar.build-sidebar {
   padding: $gl-padding 0;
 
diff --git a/app/views/projects/builds/_sidebar.html.haml b/app/views/projects/builds/_sidebar.html.haml
index 8032d81cd91..b3abc0e3da1 100644
--- a/app/views/projects/builds/_sidebar.html.haml
+++ b/app/views/projects/builds/_sidebar.html.haml
@@ -68,15 +68,8 @@
         - elsif @build.runner
           \##{@build.runner.id}
       .btn-group.btn-group-justified{ role: :group }
-        - if @build.has_trace?
-          = link_to 'Raw', raw_namespace_project_build_path(@project.namespace, @project, @build), class: 'btn btn-sm btn-default'
         - if @build.active?
           = link_to "Cancel", cancel_namespace_project_build_path(@project.namespace, @project, @build), class: 'btn btn-sm btn-default', method: :post
-        - if can?(current_user, :update_build, @project) && @build.erasable?
-          = link_to erase_namespace_project_build_path(@project.namespace, @project, @build),
-                    class: "btn btn-sm btn-default", method: :post,
-                    data: { confirm: "Are you sure you want to erase this build?" } do
-            Erase
 
     - if @build.trigger_request
       .build-widget
diff --git a/app/views/projects/builds/show.html.haml b/app/views/projects/builds/show.html.haml
index 7cb2ec83cc7..a5a9a6435e3 100644
--- a/app/views/projects/builds/show.html.haml
+++ b/app/views/projects/builds/show.html.haml
@@ -8,7 +8,7 @@
 
     - if @build.stuck?
       - unless @build.any_runners_online?
-        .bs-callout.bs-callout-warning
+        .bs-callout.bs-callout-warning.js-build-stuck
           %p
             - if no_runners_for_project?(@build.project)
               This job is stuck, because the project doesn't have any runners online assigned to it.
@@ -26,7 +26,7 @@
               Runners page
 
     - if @build.starts_environment?
-      .prepend-top-default
+      .prepend-top-default.js-environment-container
         .environment-information
           - if @build.outdated_deployment?
             = ci_icon_for_status('success_with_warnings')
@@ -47,39 +47,51 @@
             - if environment.try(:last_deployment)
               and will overwrite the #{deployment_link(environment.last_deployment, text: 'latest deployment')}
 
-    .prepend-top-default
+    .prepend-top-default.js-build-erased
       - if @build.erased?
         .erased.alert.alert-warning
           - if @build.erased_by_user?
             Job has been erased by #{link_to(@build.erased_by_name, user_path(@build.erased_by))} #{time_ago_with_tooltip(@build.erased_at)}
           - else
             Job has been erased #{time_ago_with_tooltip(@build.erased_at)}
-      - else
-        #js-build-scroll.scroll-controls
-          .scroll-step
-            %a.scroll-link.scroll-top{ href: '#up-build-trace', id: 'scroll-top', title: 'Scroll to top' }
-              = custom_icon('scroll_up')
-              = custom_icon('scroll_up_hover_active')
-            %a.scroll-link.scroll-bottom{ href: '#down-build-trace', id: 'scroll-bottom', title: 'Scroll to bottom' }
-              = custom_icon('scroll_down')
-              = custom_icon('scroll_down_hover_active')
-          - if @build.active?
-            .autoscroll-container
-              %span.status-message#autoscroll-status{ data: { state: 'disabled' } }
-                %span.status-text Autoscroll active
-                %i.status-icon
-                  = custom_icon('scroll_down_hover_active')
-        #up-build-trace
-        %pre.build-trace#build-trace
+
+    .prepend-top-default
+      .build-trace-container#build-trace
+        .top-bar.sticky
           .js-truncated-info.truncated-info.hidden<
             Showing last
             %span.js-truncated-info-size.truncated-info-size><
             KiB of log -
-            %a.js-raw-link.raw-link{ :href => raw_namespace_project_build_path(@project.namespace, @project, @build) }>< Complete Raw
-          %code.bash.js-build-output
-          .build-loader-animation.js-build-refresh
+            %a.js-raw-link.raw-link{ href: raw_namespace_project_build_path(@project.namespace, @project, @build) }>< Complete Raw
+          .controllers
+            - if @build.has_trace?
+              = link_to raw_namespace_project_build_path(@project.namespace, @project, @build),
+                      title: 'Open raw trace',
+                      data: { placement: 'top', container: 'body' },
+                      class: 'js-raw-link-controller has-tooltip' do
+                = icon('download')
+
+            - if can?(current_user, :update_build, @project) && @build.erasable?
+              = link_to erase_namespace_project_build_path(@project.namespace, @project, @build),
+                        method: :post,
+                        data: { confirm: 'Are you sure you want to erase this build?', placement: 'top', container: 'body' },
+                        title: 'Erase Build',
+                        class: 'has-tooltip js-erase-link' do
+                = icon('trash')
 
-        #down-build-trace
+            %button.js-scroll-up.btn-scroll.btn-transparent.btn-blank.has-tooltip{ type: 'button',
+                    disabled: true,
+                    title: 'Scroll Up',
+                    data: { placement: 'top', container: 'body'} }
+              = custom_icon('scroll_up')
+            %button.js-scroll-down.btn-scroll.btn-transparent.btn-blank.has-tooltip{ type: 'button',
+                    disabled: true,
+                    title: 'Scroll Down',
+                    data: { placement: 'top', container: 'body'} }
+              = custom_icon('scroll_down')
+        .bash.sticky.js-scroll-container
+          %code.js-build-output
+          .build-loader-animation.js-build-refresh
 
   = render "sidebar"
 
diff --git a/app/views/shared/icons/_scroll_down.svg b/app/views/shared/icons/_scroll_down.svg
index acf22ac9314..1d22870ec09 100644
--- a/app/views/shared/icons/_scroll_down.svg
+++ b/app/views/shared/icons/_scroll_down.svg
@@ -1,3 +1,5 @@
-<svg width="16" height="33" class="gitlab-icon-scroll-down" viewBox="0 0 16 33" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#ffffff" d="M1.385 5.534v12.47a4.145 4.145 0 0 0 4.144 4.15h4.942a4.151 4.151 0 0 0 4.144-4.15V5.535a4.145 4.145 0 0 0-4.144-4.15H5.53a4.151 4.151 0 0 0-4.144 4.15zM8.88 30.27v-4.351a.688.688 0 0 0-.69-.688.687.687 0 0 0-.69.688v4.334l-1.345-1.346a.69.69 0 0 0-.976.976l2.526 2.526a.685.685 0 0 0 .494.2.685.685 0 0 0 .493-.2l2.526-2.526a.69.69 0 1 0-.976-.976L8.88 30.27zM0 5.534A5.536 5.536 0 0 1 5.529 0h4.942A5.53 5.53 0 0 1 16 5.534v12.47a5.536 5.536 0 0 1-5.529 5.534H5.53A5.53 5.53 0 0 1 0 18.005V5.534zm7 1.01a1 1 0 1 1 2 0v2.143a1 1 0 1 1-2 0V6.544z" fill-rule="evenodd"/>
+<svg width="12" height="16" viewBox="0 0 12 16" xmlns="http://www.w3.org/2000/svg">
+  <path class="first-triangle" d="M1.048 14.155a.508.508 0 0 0-.32.105c-.091.07-.136.154-.136.25v.71c0 .095.045.178.135.249.09.07.197.105.321.105h10.043c.124 0 .23-.035.321-.105.09-.07.136-.154.136-.25v-.71c0-.095-.045-.178-.136-.249a.508.508 0 0 0-.32-.105"/>
+  <path class="second-triangle" d="M.687 8.027c-.09-.087-.122-.16-.093-.22.028-.06.104-.09.228-.09h10.5c.123 0 .2.03.228.09.029.06-.002.133-.093.22L6.393 12.91a.458.458 0 0 1-.136.089h-.37a.626.626 0 0 1-.136-.09"/>
+  <path class="third-triangle" d="M.687 1.027C.597.94.565.867.594.807c.028-.06.104-.09.228-.09h10.5c.123 0 .2.03.228.09.029.06-.002.133-.093.22L6.393 5.91A.458.458 0 0 1 6.257 6h-.37a.626.626 0 0 1-.136-.09"/>
 </svg>
diff --git a/app/views/shared/icons/_scroll_down_hover_active.svg b/app/views/shared/icons/_scroll_down_hover_active.svg
deleted file mode 100644
index 262576acf54..00000000000
--- a/app/views/shared/icons/_scroll_down_hover_active.svg
+++ /dev/null
@@ -1,3 +0,0 @@
-<svg width="16" height="33" class="gitlab-icon-scroll-down-hover" viewBox="0 0 16 33" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#ffffff" d="M8.88 30.27v-4.351a.688.688 0 0 0-.69-.688.687.687 0 0 0-.69.688v4.334l-1.345-1.346a.69.69 0 0 0-.976.976l2.526 2.526a.685.685 0 0 0 .494.2.685.685 0 0 0 .493-.2l2.526-2.526a.69.69 0 1 0-.976-.976L8.88 30.27zM0 5.534A5.536 5.536 0 0 1 5.529 0h4.942A5.53 5.53 0 0 1 16 5.534v12.47a5.536 5.536 0 0 1-5.529 5.534H5.53A5.53 5.53 0 0 1 0 18.005V5.534zm7 1.01a1 1 0 1 1 2 0v2.143a1 1 0 1 1-2 0V6.544z" fill-rule="evenodd"/>
-</svg>
diff --git a/app/views/shared/icons/_scroll_up.svg b/app/views/shared/icons/_scroll_up.svg
index f11288fd59c..70b1e4d9c91 100644
--- a/app/views/shared/icons/_scroll_up.svg
+++ b/app/views/shared/icons/_scroll_up.svg
@@ -1,3 +1 @@
-<svg width="16" height="33" class="gitlab-icon-scroll-up" viewBox="0 0 16 33" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#ffffff" d="M1.385 14.534v12.47a4.145 4.145 0 0 0 4.144 4.15h4.942a4.151 4.151 0 0 0 4.144-4.15v-12.47a4.145 4.145 0 0 0-4.144-4.15H5.53a4.151 4.151 0 0 0-4.144 4.15zM8.88 2.609V6.96a.688.688 0 0 1-.69.688.687.687 0 0 1-.69-.688V2.627L6.155 3.972a.69.69 0 0 1-.976-.976L7.705.47a.685.685 0 0 1 .494-.2.685.685 0 0 1 .493.2l2.526 2.526a.69.69 0 1 1-.976.976L8.88 2.609zM0 14.534A5.536 5.536 0 0 1 5.529 9h4.942A5.53 5.53 0 0 1 16 14.534v12.47a5.536 5.536 0 0 1-5.529 5.534H5.53A5.53 5.53 0 0 1 0 27.005V14.534zm7 1.01a1 1 0 1 1 2 0v2.143a1 1 0 1 1-2 0v-2.143z" fill-rule="evenodd"/>
-</svg>
+<svg width="12" height="16" viewBox="0 0 12 16" xmlns="http://www.w3.org/2000/svg"><path d="M1.048 1.845a.508.508 0 0 1-.32-.105c-.091-.07-.136-.154-.136-.25V.78c0-.095.045-.178.135-.249a.508.508 0 0 1 .321-.105h10.043c.124 0 .23.035.321.105.09.07.136.154.136.25v.71c0 .095-.045.178-.136.249a.508.508 0 0 1-.32.105"/><path d="M.687 7.973c-.09.087-.122.16-.093.22.028.06.104.09.228.09h10.5c.123 0 .2-.03.228-.09.029-.06-.002-.133-.093-.22L6.393 3.09A.458.458 0 0 0 6.257 3h-.37a.626.626 0 0 0-.136.09"/><path d="M.687 14.973c-.09.087-.122.16-.093.22.028.06.104.09.228.09h10.5c.123 0 .2-.03.228-.09.029-.06-.002-.133-.093-.22L6.393 10.09A.458.458 0 0 0 6.257 10h-.37a.626.626 0 0 0-.136.09"/></svg>
diff --git a/app/views/shared/icons/_scroll_up_hover_active.svg b/app/views/shared/icons/_scroll_up_hover_active.svg
deleted file mode 100644
index 4658dbb1bb7..00000000000
--- a/app/views/shared/icons/_scroll_up_hover_active.svg
+++ /dev/null
@@ -1,3 +0,0 @@
-<svg width="16" height="33" class="gitlab-icon-scroll-up-hover" viewBox="0 0 16 33" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#ffffff" d="M8.88 2.646l1.362 1.362a.69.69 0 0 0 .976-.976L8.692.507A.685.685 0 0 0 8.2.306a.685.685 0 0 0-.494.2L5.179 3.033a.69.69 0 1 0 .976.976L7.5 2.663v4.179c0 .38.306.688.69.688.381 0 .69-.306.69-.688V2.646zM0 14.534A5.536 5.536 0 0 1 5.529 9h4.942A5.53 5.53 0 0 1 16 14.534v12.47a5.536 5.536 0 0 1-5.529 5.534H5.53A5.53 5.53 0 0 1 0 27.005V14.534zm7 1.01a1 1 0 1 1 2 0v2.143a1 1 0 1 1-2 0v-2.143z" fill-rule="evenodd"/>
-</svg>
diff --git a/spec/features/projects/builds_spec.rb b/spec/features/projects/builds_spec.rb
index ab10434e10c..8f4dfa7c48b 100644
--- a/spec/features/projects/builds_spec.rb
+++ b/spec/features/projects/builds_spec.rb
@@ -190,7 +190,7 @@ feature 'Builds', :feature do
       end
 
       it do
-        expect(page).to have_link 'Raw'
+        expect(page).to have_css('.js-raw-link')
       end
     end
 
@@ -369,14 +369,14 @@ feature 'Builds', :feature do
     end
   end
 
-  describe 'GET /:project/builds/:id/raw' do
+  describe 'GET /:project/builds/:id/raw', :js do
     context 'access source' do
       context 'build from project' do
         before do
-          Capybara.current_session.driver.header('X-Sendfile-Type', 'X-Sendfile')
+          Capybara.current_session.driver.headers = { 'X-Sendfile-Type' => 'X-Sendfile' }
           build.run!
           visit namespace_project_build_path(project.namespace, project, build)
-          page.within('.js-build-sidebar') { click_link 'Raw' }
+          find('.js-raw-link-controller').click()
         end
 
         it 'sends the right headers' do
@@ -388,7 +388,7 @@ feature 'Builds', :feature do
 
       context 'build from other project' do
         before do
-          Capybara.current_session.driver.header('X-Sendfile-Type', 'X-Sendfile')
+          Capybara.current_session.driver.headers = { 'X-Sendfile-Type' => 'X-Sendfile' }
           build2.run!
           visit raw_namespace_project_build_path(project.namespace, project, build2)
         end
@@ -403,7 +403,7 @@ feature 'Builds', :feature do
       let(:existing_file) { Tempfile.new('existing-trace-file').path }
 
       before do
-        Capybara.current_session.driver.header('X-Sendfile-Type', 'X-Sendfile')
+        Capybara.current_session.driver.headers = { 'X-Sendfile-Type' => 'X-Sendfile' }
 
         build.run!
 
@@ -413,13 +413,13 @@ feature 'Builds', :feature do
         visit namespace_project_build_path(project.namespace, project, build)
       end
 
-      context 'when build has trace in file' do
+      context 'when build has trace in file', :js do
         let(:paths) do
           [existing_file]
         end
 
         before do
-          page.within('.js-build-sidebar') { click_link 'Raw' }
+          find('.js-raw-link-controller').click()
         end
 
         it 'sends the right headers' do
@@ -433,7 +433,7 @@ feature 'Builds', :feature do
         let(:paths) { [] }
 
         it 'sends the right headers' do
-          expect(page.status_code).not_to have_link('Raw')
+          expect(page.status_code).not_to have_selector('.js-raw-link-controller')
         end
       end
     end
diff --git a/spec/javascripts/build_spec.js b/spec/javascripts/build_spec.js
index 8ec96bdb583..278bd1f9179 100644
--- a/spec/javascripts/build_spec.js
+++ b/spec/javascripts/build_spec.js
@@ -14,7 +14,6 @@ describe('Build', () => {
 
   beforeEach(() => {
     loadFixtures('builds/build-with-artifacts.html.raw');
-    spyOn($, 'ajax');
   });
 
   describe('class constructor', () => {
@@ -33,7 +32,6 @@ describe('Build', () => {
 
       it('copies build options', function () {
         expect(this.build.pageUrl).toBe(BUILD_URL);
-        expect(this.build.buildUrl).toBe(`${BUILD_URL}.json`);
         expect(this.build.buildStatus).toBe('success');
         expect(this.build.buildStage).toBe('test');
         expect(this.build.state).toBe('');
@@ -65,27 +63,14 @@ describe('Build', () => {
     });
 
     describe('running build', () => {
-      beforeEach(function () {
-        this.build = new Build();
-      });
-
       it('updates the build trace on an interval', function () {
+        const deferred1 = $.Deferred();
+        const deferred2 = $.Deferred();
+        const deferred3 = $.Deferred();
+        spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise(), deferred3.promise());
         spyOn(gl.utils, 'visitUrl');
 
-        jasmine.clock().tick(4001);
-
-        expect($.ajax.calls.count()).toBe(1);
-
-        // We have to do it this way to prevent Webpack to fail to compile
-        // when destructuring assignments and reusing
-        // the same variables names inside the same scope
-        let args = $.ajax.calls.argsFor(0)[0];
-
-        expect(args.url).toBe(`${BUILD_URL}/trace.json`);
-        expect(args.dataType).toBe('json');
-        expect(args.success).toEqual(jasmine.any(Function));
-
-        args.success.call($, {
+        deferred1.resolve({
           html: '<span>Update<span>',
           status: 'running',
           state: 'newstate',
@@ -93,20 +78,9 @@ describe('Build', () => {
           complete: false,
         });
 
-        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
-        expect(this.build.state).toBe('newstate');
-
-        jasmine.clock().tick(4001);
-
-        expect($.ajax.calls.count()).toBe(3);
-
-        args = $.ajax.calls.argsFor(2)[0];
-        expect(args.url).toBe(`${BUILD_URL}/trace.json`);
-        expect(args.dataType).toBe('json');
-        expect(args.data.state).toBe('newstate');
-        expect(args.success).toEqual(jasmine.any(Function));
+        deferred2.resolve();
 
-        args.success.call($, {
+        deferred3.resolve({
           html: '<span>More</span>',
           status: 'running',
           state: 'finalstate',
@@ -114,150 +88,222 @@ describe('Build', () => {
           complete: true,
         });
 
+        this.build = new Build();
+
+        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
+        expect(this.build.state).toBe('newstate');
+
+        jasmine.clock().tick(4001);
+
         expect($('#build-trace .js-build-output').text()).toMatch(/UpdateMore/);
         expect(this.build.state).toBe('finalstate');
       });
 
       it('replaces the entire build trace', () => {
+        const deferred1 = $.Deferred();
+        const deferred2 = $.Deferred();
+        const deferred3 = $.Deferred();
+
+        spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise(), deferred3.promise());
+
         spyOn(gl.utils, 'visitUrl');
 
-        jasmine.clock().tick(4001);
-        let args = $.ajax.calls.argsFor(0)[0];
-        args.success.call($, {
-          html: '<span>Update</span>',
+        deferred1.resolve({
+          html: '<span>Update<span>',
           status: 'running',
           append: false,
           complete: false,
         });
 
-        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
+        deferred2.resolve();
 
-        jasmine.clock().tick(4001);
-        args = $.ajax.calls.argsFor(2)[0];
-        args.success.call($, {
+        deferred3.resolve({
           html: '<span>Different</span>',
           status: 'running',
           append: false,
         });
 
+        this.build = new Build();
+
+        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
+
+        jasmine.clock().tick(4001);
+
         expect($('#build-trace .js-build-output').text()).not.toMatch(/Update/);
         expect($('#build-trace .js-build-output').text()).toMatch(/Different/);
       });
 
       it('reloads the page when the build is done', () => {
         spyOn(gl.utils, 'visitUrl');
+        const deferred = $.Deferred();
 
-        jasmine.clock().tick(4001);
-        const [{ success }] = $.ajax.calls.argsFor(0);
-        success.call($, {
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        deferred.resolve({
           html: '<span>Final</span>',
           status: 'passed',
           append: true,
           complete: true,
         });
 
+        this.build = new Build();
+
         expect(gl.utils.visitUrl).toHaveBeenCalledWith(BUILD_URL);
       });
+    });
 
-      describe('truncated information', () => {
-        describe('when size is less than total', () => {
-          it('shows information about truncated log', () => {
-            jasmine.clock().tick(4001);
-            const [{ success }] = $.ajax.calls.argsFor(0);
-
-            success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: false,
-              size: 50,
-              total: 100,
-            });
-
-            expect(document.querySelector('.js-truncated-info').classList).not.toContain('hidden');
+    describe('truncated information', () => {
+      describe('when size is less than total', () => {
+        it('shows information about truncated log', () => {
+          spyOn(gl.utils, 'visitUrl');
+          const deferred = $.Deferred();
+          spyOn($, 'ajax').and.returnValue(deferred.promise());
+
+          deferred.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: false,
+            size: 50,
+            total: 100,
           });
 
-          it('shows the size in KiB', () => {
-            jasmine.clock().tick(4001);
-            const [{ success }] = $.ajax.calls.argsFor(0);
-            const size = 50;
-
-            success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: false,
-              size,
-              total: 100,
-            });
-
-            expect(
-              document.querySelector('.js-truncated-info-size').textContent.trim(),
-            ).toEqual(`${bytesToKiB(size)}`);
+          this.build = new Build();
+
+          expect(document.querySelector('.js-truncated-info').classList).not.toContain('hidden');
+        });
+
+        it('shows the size in KiB', () => {
+          const size = 50;
+          spyOn(gl.utils, 'visitUrl');
+          const deferred = $.Deferred();
+
+          spyOn($, 'ajax').and.returnValue(deferred.promise());
+          deferred.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: false,
+            size,
+            total: 100,
           });
 
-          it('shows incremented size', () => {
-            jasmine.clock().tick(4001);
-            let args = $.ajax.calls.argsFor(0)[0];
-            args.success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: false,
-              size: 50,
-              total: 100,
-            });
-
-            expect(
-              document.querySelector('.js-truncated-info-size').textContent.trim(),
-            ).toEqual(`${bytesToKiB(50)}`);
-
-            jasmine.clock().tick(4001);
-            args = $.ajax.calls.argsFor(2)[0];
-            args.success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: true,
-              size: 10,
-              total: 100,
-            });
-
-            expect(
-              document.querySelector('.js-truncated-info-size').textContent.trim(),
-            ).toEqual(`${bytesToKiB(60)}`);
+          this.build = new Build();
+
+          expect(
+            document.querySelector('.js-truncated-info-size').textContent.trim(),
+          ).toEqual(`${bytesToKiB(size)}`);
+        });
+
+        it('shows incremented size', () => {
+          const deferred1 = $.Deferred();
+          const deferred2 = $.Deferred();
+          const deferred3 = $.Deferred();
+
+          spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise(), deferred3.promise());
+
+          spyOn(gl.utils, 'visitUrl');
+
+          deferred1.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: false,
+            size: 50,
+            total: 100,
           });
 
-          it('renders the raw link', () => {
-            jasmine.clock().tick(4001);
-            const [{ success }] = $.ajax.calls.argsFor(0);
-
-            success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: false,
-              size: 50,
-              total: 100,
-            });
-
-            expect(
-              document.querySelector('.js-raw-link').textContent.trim(),
-            ).toContain('Complete Raw');
+          deferred2.resolve();
+
+          this.build = new Build();
+
+          expect(
+            document.querySelector('.js-truncated-info-size').textContent.trim(),
+          ).toEqual(`${bytesToKiB(50)}`);
+
+          jasmine.clock().tick(4001);
+
+          deferred3.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: true,
+            size: 10,
+            total: 100,
           });
+
+          expect(
+            document.querySelector('.js-truncated-info-size').textContent.trim(),
+          ).toEqual(`${bytesToKiB(60)}`);
         });
 
-        describe('when size is equal than total', () => {
-          it('does not show the trunctated information', () => {
-            jasmine.clock().tick(4001);
-            const [{ success }] = $.ajax.calls.argsFor(0);
+        it('renders the raw link', () => {
+          const deferred = $.Deferred();
+          spyOn(gl.utils, 'visitUrl');
+
+          spyOn($, 'ajax').and.returnValue(deferred.promise());
+          deferred.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: false,
+            size: 50,
+            total: 100,
+          });
 
-            success.call($, {
-              html: '<span>Update</span>',
-              status: 'success',
-              append: false,
-              size: 100,
-              total: 100,
-            });
+          this.build = new Build();
 
-            expect(document.querySelector('.js-truncated-info').classList).toContain('hidden');
+          expect(
+            document.querySelector('.js-raw-link').textContent.trim(),
+          ).toContain('Complete Raw');
+        });
+      });
+
+      describe('when size is equal than total', () => {
+        it('does not show the trunctated information', () => {
+          const deferred = $.Deferred();
+          spyOn(gl.utils, 'visitUrl');
+
+          spyOn($, 'ajax').and.returnValue(deferred.promise());
+          deferred.resolve({
+            html: '<span>Update</span>',
+            status: 'success',
+            append: false,
+            size: 100,
+            total: 100,
           });
+
+          this.build = new Build();
+
+          expect(document.querySelector('.js-truncated-info').classList).toContain('hidden');
+        });
+      });
+    });
+
+    describe('output trace', () => {
+      beforeEach(() => {
+        const deferred = $.Deferred();
+        spyOn(gl.utils, 'visitUrl');
+
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        deferred.resolve({
+          html: '<span>Update</span>',
+          status: 'success',
+          append: false,
+          size: 50,
+          total: 100,
         });
+
+        this.build = new Build();
+      });
+
+      it('should render trace controls', () => {
+        const controllers = document.querySelector('.controllers');
+
+        expect(controllers.querySelector('.js-raw-link-controller')).toBeDefined();
+        expect(controllers.querySelector('.js-erase-link')).toBeDefined();
+        expect(controllers.querySelector('.js-scroll-up')).toBeDefined();
+        expect(controllers.querySelector('.js-scroll-down')).toBeDefined();
+      });
+
+      it('should render received output', () => {
+        expect(
+          document.querySelector('.js-build-output').innerHTML,
+        ).toEqual('<span>Update</span>');
       });
     });
   });