Add Prometheus memory sparkline to MR widget

2 files changed, 212 insertions, 0 deletions

diff --git a/spec/javascripts/vue_shared/components/memory_graph_spec.js b/spec/javascripts/vue_shared/components/memory_graph_spec.js
new file mode 100644
index 00000000000..d46a3f2328e
--- /dev/null
+++ b/spec/javascripts/vue_shared/components/memory_graph_spec.js
@@ -0,0 +1,143 @@
+import Vue from 'vue';
+import memoryGraphComponent from '~/vue_shared/components/memory_graph';
+import { mockMetrics, mockMedian, mockMedianIndex } from './mock_data';
+
+const defaultHeight = '25';
+const defaultWidth = '100';
+
+const createComponent = () => {
+  const Component = Vue.extend(memoryGraphComponent);
+
+  return new Component({
+    el: document.createElement('div'),
+    propsData: {
+      metrics: [],
+      deploymentTime: 0,
+      width: '',
+      height: '',
+      pathD: '',
+      pathViewBox: '',
+      dotX: '',
+      dotY: '',
+    },
+  });
+};
+
+describe('MemoryGraph', () => {
+  let vm;
+  let el;
+
+  beforeEach(() => {
+    vm = createComponent();
+    el = vm.$el;
+  });
+
+  describe('props', () => {
+    it('should have props with defaults', (done) => {
+      const { metrics, deploymentTime, width, height } = memoryGraphComponent.props;
+
+      Vue.nextTick(() => {
+        const typeClassMatcher = (propItem, expectedType) => {
+          const PropItemTypeClass = propItem.type;
+          expect(new PropItemTypeClass() instanceof expectedType).toBeTruthy();
+          expect(propItem.required).toBeTruthy();
+        };
+
+        typeClassMatcher(metrics, Array);
+        typeClassMatcher(deploymentTime, Number);
+        typeClassMatcher(width, String);
+        typeClassMatcher(height, String);
+        done();
+      });
+    });
+  });
+
+  describe('data', () => {
+    it('should have default data', () => {
+      const data = memoryGraphComponent.data();
+      const dataValidator = (dataItem, expectedType, defaultVal) => {
+        expect(typeof dataItem).toBe(expectedType);
+        expect(dataItem).toBe(defaultVal);
+      };
+
+      dataValidator(data.pathD, 'string', '');
+      dataValidator(data.pathViewBox, 'string', '');
+      dataValidator(data.dotX, 'string', '');
+      dataValidator(data.dotY, 'string', '');
+    });
+  });
+
+  describe('computed', () => {
+    describe('getFormattedMedian', () => {
+      it('should show human readable median value based on provided median timestamp', () => {
+        vm.deploymentTime = mockMedian;
+        const formattedMedian = vm.getFormattedMedian;
+        expect(formattedMedian.indexOf('Deployed') > -1).toBeTruthy();
+        expect(formattedMedian.indexOf('ago') > -1).toBeTruthy();
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('getMedianMetricIndex', () => {
+      it('should return index of closest metric timestamp to that of median', () => {
+        const matchingIndex = vm.getMedianMetricIndex(mockMedian, mockMetrics);
+        expect(matchingIndex).toBe(mockMedianIndex);
+      });
+    });
+
+    describe('getGraphPlotValues', () => {
+      it('should return Object containing values to plot graph', () => {
+        const plotValues = vm.getGraphPlotValues(mockMedian, mockMetrics);
+        expect(plotValues.pathD).toBeDefined();
+        expect(Array.isArray(plotValues.pathD)).toBeTruthy();
+
+        expect(plotValues.pathViewBox).toBeDefined();
+        expect(typeof plotValues.pathViewBox).toBe('object');
+
+        expect(plotValues.dotX).toBeDefined();
+        expect(typeof plotValues.dotX).toBe('number');
+
+        expect(plotValues.dotY).toBeDefined();
+        expect(typeof plotValues.dotY).toBe('number');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('should render template elements correctly', () => {
+      expect(el.classList.contains('memory-graph-container')).toBeTruthy();
+      expect(el.querySelector('svg')).toBeDefined();
+    });
+
+    it('should render graph when renderGraph is called internally', (done) => {
+      const { pathD, pathViewBox, dotX, dotY } = vm.getGraphPlotValues(mockMedian, mockMetrics);
+      vm.height = defaultHeight;
+      vm.width = defaultWidth;
+      vm.pathD = `M ${pathD}`;
+      vm.pathViewBox = `0 0 ${pathViewBox.lineWidth} ${pathViewBox.diff}`;
+      vm.dotX = dotX;
+      vm.dotY = dotY;
+
+      Vue.nextTick(() => {
+        const svgEl = el.querySelector('svg');
+        expect(svgEl).toBeDefined();
+        expect(svgEl.getAttribute('height')).toBe(defaultHeight);
+        expect(svgEl.getAttribute('width')).toBe(defaultWidth);
+
+        const pathEl = el.querySelector('path');
+        expect(pathEl).toBeDefined();
+        expect(pathEl.getAttribute('d')).toBe(`M ${pathD}`);
+        expect(pathEl.getAttribute('viewBox')).toBe(`0 0 ${pathViewBox.lineWidth} ${pathViewBox.diff}`);
+
+        const circleEl = el.querySelector('circle');
+        expect(circleEl).toBeDefined();
+        expect(circleEl.getAttribute('r')).toBe('1.5');
+        expect(circleEl.getAttribute('tranform')).toBe('translate(0 -1)');
+        expect(circleEl.getAttribute('cx')).toBe(`${dotX}`);
+        expect(circleEl.getAttribute('cy')).toBe(`${dotY}`);
+        done();
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/vue_shared/components/mock_data.js b/spec/javascripts/vue_shared/components/mock_data.js
new file mode 100644
index 00000000000..0d781bdca74
--- /dev/null
+++ b/spec/javascripts/vue_shared/components/mock_data.js
@@ -0,0 +1,69 @@
+/* eslint-disable */
+
+export const mockMetrics = [
+  [1493716685, '4.30859375'],
+  [1493716745, '4.30859375'],
+  [1493716805, '4.30859375'],
+  [1493716865, '4.30859375'],
+  [1493716925, '4.30859375'],
+  [1493716985, '4.30859375'],
+  [1493717045, '4.30859375'],
+  [1493717105, '4.30859375'],
+  [1493717165, '4.30859375'],
+  [1493717225, '4.30859375'],
+  [1493717285, '4.30859375'],
+  [1493717345, '4.30859375'],
+  [1493717405, '4.30859375'],
+  [1493717465, '4.30859375'],
+  [1493717525, '4.30859375'],
+  [1493717585, '4.30859375'],
+  [1493717645, '4.30859375'],
+  [1493717705, '4.30859375'],
+  [1493717765, '4.30859375'],
+  [1493717825, '4.30859375'],
+  [1493717885, '4.30859375'],
+  [1493717945, '4.30859375'],
+  [1493718005, '4.30859375'],
+  [1493718065, '4.30859375'],
+  [1493718125, '4.30859375'],
+  [1493718185, '4.30859375'],
+  [1493718245, '4.30859375'],
+  [1493718305, '4.234375'],
+  [1493718365, '4.234375'],
+  [1493718425, '4.234375'],
+  [1493718485, '4.234375'],
+  [1493718545, '4.243489583333333'],
+  [1493718605, '4.2109375'],
+  [1493718665, '4.2109375'],
+  [1493718725, '4.2109375'],
+  [1493718785, '4.26171875'],
+  [1493718845, '4.26171875'],
+  [1493718905, '4.26171875'],
+  [1493718965, '4.26171875'],
+  [1493719025, '4.26171875'],
+  [1493719085, '4.26171875'],
+  [1493719145, '4.26171875'],
+  [1493719205, '4.26171875'],
+  [1493719265, '4.26171875'],
+  [1493719325, '4.26171875'],
+  [1493719385, '4.26171875'],
+  [1493719445, '4.26171875'],
+  [1493719505, '4.26171875'],
+  [1493719565, '4.26171875'],
+  [1493719625, '4.26171875'],
+  [1493719685, '4.26171875'],
+  [1493719745, '4.26171875'],
+  [1493719805, '4.26171875'],
+  [1493719865, '4.26171875'],
+  [1493719925, '4.26171875'],
+  [1493719985, '4.26171875'],
+  [1493720045, '4.26171875'],
+  [1493720105, '4.26171875'],
+  [1493720165, '4.26171875'],
+  [1493720225, '4.26171875'],
+  [1493720285, '4.26171875'],
+];
+
+export const mockMedian = 1493718485;
+
+export const mockMedianIndex = 30;