Merge branch 'release-boba' into masterupstream/fabian-merge-v4.0.0

# Conflicts:
#	circle.yml
#	include/mbgl/style/expression/let.hpp
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLngBounds.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapGestureDetector.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapKeyListener.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapboxMap.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/Projection.java
#	platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/Transform.java
#	platform/android/MapboxGLAndroidSDK/src/test/java/com/mapbox/mapboxsdk/geometry/LatLngBoundsTest.java
#	platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml
#	platform/android/gradle/dependencies.gradle
#	platform/android/src/example_custom_layer.cpp
#	platform/android/src/geojson/point.cpp
#	platform/darwin/src/NSPredicate+MGLAdditions.mm
#	platform/darwin/test/MGLExpressionTests.mm
#	platform/ios/Mapbox-iOS-SDK-nightly-dynamic.podspec
#	platform/ios/Mapbox-iOS-SDK-symbols.podspec
#	platform/ios/Mapbox-iOS-SDK.podspec
#	platform/ios/app/MBXViewController.m
#	src/mbgl/renderer/layers/render_custom_layer.cpp
#	src/mbgl/style/conversion/filter.cpp
#	src/mbgl/style/expression/interpolate.cpp
#	src/mbgl/style/expression/value.cpp
#	test/style/filter.test.cpp

1 files changed, 150 insertions, 687 deletions

diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/FillLayerTest.java b/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/FillLayerTest.java
index 939bcb6892..bdbd8958d2 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/FillLayerTest.java
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/FillLayerTest.java
@@ -3,31 +3,18 @@
 package com.mapbox.mapboxsdk.testapp.style;
 
 import android.graphics.Color;
-import android.support.test.espresso.UiController;
 import android.support.test.runner.AndroidJUnit4;
 
 import timber.log.Timber;
 
-import com.mapbox.mapboxsdk.maps.MapboxMap;
-import com.mapbox.mapboxsdk.style.functions.CompositeFunction;
-import com.mapbox.mapboxsdk.style.functions.CameraFunction;
-import com.mapbox.mapboxsdk.style.functions.SourceFunction;
-import com.mapbox.mapboxsdk.style.functions.stops.CategoricalStops;
-import com.mapbox.mapboxsdk.style.functions.stops.ExponentialStops;
-import com.mapbox.mapboxsdk.style.functions.stops.IdentityStops;
-import com.mapbox.mapboxsdk.style.functions.stops.IntervalStops;
-import com.mapbox.mapboxsdk.style.functions.stops.Stop;
-import com.mapbox.mapboxsdk.style.functions.stops.Stops;
+import com.mapbox.mapboxsdk.style.expressions.Expression;
 import com.mapbox.mapboxsdk.style.layers.FillLayer;
-import com.mapbox.mapboxsdk.testapp.action.MapboxMapAction;
 import com.mapbox.mapboxsdk.testapp.activity.BaseActivityTest;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static com.mapbox.mapboxsdk.style.functions.Function.*;
-import static com.mapbox.mapboxsdk.style.functions.stops.Stop.stop;
-import static com.mapbox.mapboxsdk.style.functions.stops.Stops.*;
+import static com.mapbox.mapboxsdk.style.expressions.Expression.*;
 import static com.mapbox.mapboxsdk.testapp.action.MapboxMapAction.invoke;
 import static org.junit.Assert.*;
 import static com.mapbox.mapboxsdk.style.layers.Property.*;
@@ -51,17 +38,14 @@ public class FillLayerTest extends BaseActivityTest {
 
   private void setupLayer() {
     Timber.i("Retrieving layer");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        if ((layer = mapboxMap.getLayerAs("my-layer")) == null) {
-          Timber.i("Adding layer");
-          layer = new FillLayer("my-layer", "composite");
-          layer.setSourceLayer("composite");
-          mapboxMap.addLayer(layer);
-          // Layer reference is now stale, get new reference
-          layer = mapboxMap.getLayerAs("my-layer");
-        }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      if ((layer = mapboxMap.getLayerAs("my-layer")) == null) {
+        Timber.i("Adding layer");
+        layer = new FillLayer("my-layer", "composite");
+        layer.setSourceLayer("composite");
+        mapboxMap.addLayer(layer);
+        // Layer reference is now stale, get new reference
+        layer = mapboxMap.getLayerAs("my-layer");
       }
     });
   }
@@ -71,18 +55,15 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("Visibility");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-        // Get initial
-        assertEquals(layer.getVisibility().getValue(), VISIBLE);
+      // Get initial
+      assertEquals(layer.getVisibility().getValue(), VISIBLE);
 
-        // Set
-        layer.setProperties(visibility(NONE));
-        assertEquals(layer.getVisibility().getValue(), NONE);
-      }
+      // Set
+      layer.setProperties(visibility(NONE));
+      assertEquals(layer.getVisibility().getValue(), NONE);
     });
   }
 
@@ -91,67 +72,50 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("SourceLayer");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Get initial
-        assertEquals(layer.getSourceLayer(), "composite");
-
-        // Set
-        final String sourceLayer = "test";
-        layer.setSourceLayer(sourceLayer);
-        assertEquals(layer.getSourceLayer(), sourceLayer);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Get initial
+      assertEquals(layer.getSourceLayer(), "composite");
+
+      // Set
+      final String sourceLayer = "test";
+      layer.setSourceLayer(sourceLayer);
+      assertEquals(layer.getSourceLayer(), sourceLayer);
     });
   }
 
   @Test
-  public void testFillAntialiasAsConstant() {
+  public void testFilter() {
     validateTestSetup();
     setupLayer();
-    Timber.i("fill-antialias");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillAntialias(true));
-        assertEquals((Boolean) layer.getFillAntialias().getValue(), (Boolean) true);
-      }
+    Timber.i("Filter");
+    invoke(mapboxMap, (uiController, mapboxMap1) -> {
+      assertNotNull(layer);
+
+      // Get initial
+      assertEquals(layer.getFilter(), null);
+
+      // Set
+      Expression filter = eq(get("undefined"), literal(1.0));
+      layer.setFilter(filter);
+      assertEquals(layer.getFilter().toString(), filter.toString());
     });
   }
 
+
+
   @Test
-  public void testFillAntialiasAsCameraFunction() {
+  public void testFillAntialiasAsConstant() {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-antialias");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillAntialias(
-            zoom(
-              interval(
-                stop(2, fillAntialias(true))
-              )
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillAntialias());
-        assertNotNull(layer.getFillAntialias().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillAntialias().getFunction().getClass());
-        assertEquals(IntervalStops.class, layer.getFillAntialias().getFunction().getStops().getClass());
-        assertEquals(1, ((IntervalStops) layer.getFillAntialias().getFunction().getStops()).size());
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      layer.setProperties(fillAntialias(true));
+      assertEquals((Boolean) layer.getFillAntialias().getValue(), (Boolean) true);
     });
   }
 
@@ -160,216 +124,58 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-opacityTransitionOptions");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        TransitionOptions options = new TransitionOptions(300, 100);
-        layer.setFillOpacityTransition(options);
-        assertEquals(layer.getFillOpacityTransition(), options);
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillOpacityAsConstant() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillOpacity(0.3f));
-        assertEquals((Float) layer.getFillOpacity().getValue(), (Float) 0.3f);
-      }
+      // Set and Get
+      TransitionOptions options = new TransitionOptions(300, 100);
+      layer.setFillOpacityTransition(options);
+      assertEquals(layer.getFillOpacityTransition(), options);
     });
   }
 
   @Test
-  public void testFillOpacityAsCameraFunction() {
+  public void testFillOpacityAsConstant() {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOpacity(
-            zoom(
-              exponential(
-                stop(2, fillOpacity(0.3f))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOpacity());
-        assertNotNull(layer.getFillOpacity().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillOpacity().getFunction().getClass());
-        assertEquals(ExponentialStops.class, layer.getFillOpacity().getFunction().getStops().getClass());
-        assertEquals(0.5f, ((ExponentialStops) layer.getFillOpacity().getFunction().getStops()).getBase(), 0.001);
-        assertEquals(1, ((ExponentialStops) layer.getFillOpacity().getFunction().getStops()).size());
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillOpacityAsIdentitySourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOpacity(property("FeaturePropertyA", Stops.<Float>identity()))
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOpacity());
-        assertNotNull(layer.getFillOpacity().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOpacity().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOpacity().getFunction()).getProperty());
-        assertEquals(IdentityStops.class, layer.getFillOpacity().getFunction().getStops().getClass());
-      }
+      // Set and Get
+      layer.setProperties(fillOpacity(0.3f));
+      assertEquals((Float) layer.getFillOpacity().getValue(), (Float) 0.3f);
     });
   }
 
   @Test
-  public void testFillOpacityAsExponentialSourceFunction() {
+  public void testFillOpacityAsExpression() {
     validateTestSetup();
     setupLayer();
-    Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOpacity(
-            property(
-              "FeaturePropertyA",
-              exponential(
-                stop(0.3f, fillOpacity(0.3f))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOpacity());
-        assertNotNull(layer.getFillOpacity().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOpacity().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOpacity().getFunction()).getProperty());
-        assertEquals(ExponentialStops.class, layer.getFillOpacity().getFunction().getStops().getClass());
-      }
-    });
-  }
+    Timber.i("fill-opacity-expression");
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillOpacityAsCategoricalSourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOpacity(
-            property(
-              "FeaturePropertyA",
-              categorical(
-                stop(1.0f, fillOpacity(0.3f))
-              )
-            ).withDefaultValue(fillOpacity(0.3f))
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOpacity());
-        assertNotNull(layer.getFillOpacity().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOpacity().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOpacity().getFunction()).getProperty());
-        assertEquals(CategoricalStops.class, layer.getFillOpacity().getFunction().getStops().getClass());
-        assertNotNull(((SourceFunction) layer.getFillOpacity().getFunction()).getDefaultValue());
-        assertNotNull(((SourceFunction) layer.getFillOpacity().getFunction()).getDefaultValue().getValue());
-        assertEquals(0.3f, ((SourceFunction) layer.getFillOpacity().getFunction()).getDefaultValue().getValue());
-      }
+      // Set and Get
+      Expression expression = number(Expression.get("undefined"));
+      layer.setProperties(fillOpacity(expression));
+      assertEquals(layer.getFillOpacity().getExpression(), expression);
     });
-
   }
 
-  @Test
-  public void testFillOpacityAsCompositeFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-opacity");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOpacity(
-            composite(
-              "FeaturePropertyA",
-              exponential(
-                stop(0, 0.3f, fillOpacity(0.9f))
-              ).withBase(0.5f)
-            ).withDefaultValue(fillOpacity(0.3f))
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOpacity());
-        assertNotNull(layer.getFillOpacity().getFunction());
-        assertEquals(CompositeFunction.class, layer.getFillOpacity().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((CompositeFunction) layer.getFillOpacity().getFunction()).getProperty());
-        assertEquals(ExponentialStops.class, layer.getFillOpacity().getFunction().getStops().getClass());
-        assertEquals(1, ((ExponentialStops) layer.getFillOpacity().getFunction().getStops()).size());
-
-        ExponentialStops<Stop.CompositeValue<Float, Float>, Float> stops =
-          (ExponentialStops<Stop.CompositeValue<Float, Float>, Float>) layer.getFillOpacity().getFunction().getStops();
-        Stop<Stop.CompositeValue<Float, Float>, Float> stop = stops.iterator().next();
-        assertEquals(0f, stop.in.zoom, 0.001);
-        assertEquals(0.3f, stop.in.value, 0.001f);
-        assertEquals(0.9f, stop.out, 0.001f);
-      }
-    });
-  }
 
   @Test
   public void testFillColorTransition() {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-colorTransitionOptions");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        TransitionOptions options = new TransitionOptions(300, 100);
-        layer.setFillColorTransition(options);
-        assertEquals(layer.getFillColorTransition(), options);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      TransitionOptions options = new TransitionOptions(300, 100);
+      layer.setFillColorTransition(options);
+      assertEquals(layer.getFillColorTransition(), options);
     });
   }
 
@@ -378,157 +184,42 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillColor("rgba(0, 0, 0, 1)"));
-        assertEquals((String) layer.getFillColor().getValue(), (String) "rgba(0, 0, 0, 1)");
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillColorAsCameraFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillColor(
-            zoom(
-              exponential(
-                stop(2, fillColor("rgba(0, 0, 0, 1)"))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillColor());
-        assertNotNull(layer.getFillColor().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillColor().getFunction().getClass());
-        assertEquals(ExponentialStops.class, layer.getFillColor().getFunction().getStops().getClass());
-        assertEquals(0.5f, ((ExponentialStops) layer.getFillColor().getFunction().getStops()).getBase(), 0.001);
-        assertEquals(1, ((ExponentialStops) layer.getFillColor().getFunction().getStops()).size());
-      }
+      // Set and Get
+      layer.setProperties(fillColor("rgba(0, 0, 0, 1)"));
+      assertEquals((String) layer.getFillColor().getValue(), (String) "rgba(0, 0, 0, 1)");
     });
   }
 
   @Test
-  public void testFillColorAsIdentitySourceFunction() {
+  public void testFillColorAsExpression() {
     validateTestSetup();
     setupLayer();
-    Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillColor(property("FeaturePropertyA", Stops.<String>identity()))
-        );
-
-        // Verify
-        assertNotNull(layer.getFillColor());
-        assertNotNull(layer.getFillColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillColor().getFunction()).getProperty());
-        assertEquals(IdentityStops.class, layer.getFillColor().getFunction().getStops().getClass());
-      }
-    });
-  }
+    Timber.i("fill-color-expression");
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillColorAsExponentialSourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillColor(
-            property(
-              "FeaturePropertyA",
-              exponential(
-                stop(Color.RED, fillColor(Color.RED))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillColor());
-        assertNotNull(layer.getFillColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillColor().getFunction()).getProperty());
-        assertEquals(ExponentialStops.class, layer.getFillColor().getFunction().getStops().getClass());
-      }
+      // Set and Get
+      Expression expression = toColor(Expression.get("undefined"));
+      layer.setProperties(fillColor(expression));
+      assertEquals(layer.getFillColor().getExpression(), expression);
     });
   }
 
-  @Test
-  public void testFillColorAsCategoricalSourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillColor(
-            property(
-              "FeaturePropertyA",
-              categorical(
-                stop("valueA", fillColor(Color.RED))
-              )
-            ).withDefaultValue(fillColor(Color.GREEN))
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillColor());
-        assertNotNull(layer.getFillColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillColor().getFunction()).getProperty());
-        assertEquals(CategoricalStops.class, layer.getFillColor().getFunction().getStops().getClass());
-        assertNotNull(((SourceFunction) layer.getFillColor().getFunction()).getDefaultValue());
-        assertNotNull(((SourceFunction) layer.getFillColor().getFunction()).getDefaultValue().getValue());
-        assertEquals(Color.GREEN, (int) ((SourceFunction) layer.getFillColor().getFunction()).getDefaultValue().getColorInt());
-      }
-    });
-
-  }
 
   @Test
   public void testFillColorAsIntConstant() {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillColor(Color.RED));
-        assertEquals(layer.getFillColorAsInt(), Color.RED);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      layer.setProperties(fillColor(Color.RED));
+      assertEquals(layer.getFillColorAsInt(), Color.RED);
     });
   }
 
@@ -537,16 +228,13 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-outline-colorTransitionOptions");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        TransitionOptions options = new TransitionOptions(300, 100);
-        layer.setFillOutlineColorTransition(options);
-        assertEquals(layer.getFillOutlineColorTransition(), options);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      TransitionOptions options = new TransitionOptions(300, 100);
+      layer.setFillOutlineColorTransition(options);
+      assertEquals(layer.getFillOutlineColorTransition(), options);
     });
   }
 
@@ -555,157 +243,42 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillOutlineColor("rgba(0, 0, 0, 1)"));
-        assertEquals((String) layer.getFillOutlineColor().getValue(), (String) "rgba(0, 0, 0, 1)");
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillOutlineColorAsCameraFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOutlineColor(
-            zoom(
-              exponential(
-                stop(2, fillOutlineColor("rgba(0, 0, 0, 1)"))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOutlineColor());
-        assertNotNull(layer.getFillOutlineColor().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillOutlineColor().getFunction().getClass());
-        assertEquals(ExponentialStops.class, layer.getFillOutlineColor().getFunction().getStops().getClass());
-        assertEquals(0.5f, ((ExponentialStops) layer.getFillOutlineColor().getFunction().getStops()).getBase(), 0.001);
-        assertEquals(1, ((ExponentialStops) layer.getFillOutlineColor().getFunction().getStops()).size());
-      }
+      // Set and Get
+      layer.setProperties(fillOutlineColor("rgba(0, 0, 0, 1)"));
+      assertEquals((String) layer.getFillOutlineColor().getValue(), (String) "rgba(0, 0, 0, 1)");
     });
   }
 
   @Test
-  public void testFillOutlineColorAsIdentitySourceFunction() {
+  public void testFillOutlineColorAsExpression() {
     validateTestSetup();
     setupLayer();
-    Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOutlineColor(property("FeaturePropertyA", Stops.<String>identity()))
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOutlineColor());
-        assertNotNull(layer.getFillOutlineColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOutlineColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOutlineColor().getFunction()).getProperty());
-        assertEquals(IdentityStops.class, layer.getFillOutlineColor().getFunction().getStops().getClass());
-      }
-    });
-  }
+    Timber.i("fill-outline-color-expression");
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillOutlineColorAsExponentialSourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOutlineColor(
-            property(
-              "FeaturePropertyA",
-              exponential(
-                stop(Color.RED, fillOutlineColor(Color.RED))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOutlineColor());
-        assertNotNull(layer.getFillOutlineColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOutlineColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOutlineColor().getFunction()).getProperty());
-        assertEquals(ExponentialStops.class, layer.getFillOutlineColor().getFunction().getStops().getClass());
-      }
+      // Set and Get
+      Expression expression = toColor(Expression.get("undefined"));
+      layer.setProperties(fillOutlineColor(expression));
+      assertEquals(layer.getFillOutlineColor().getExpression(), expression);
     });
   }
 
-  @Test
-  public void testFillOutlineColorAsCategoricalSourceFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillOutlineColor(
-            property(
-              "FeaturePropertyA",
-              categorical(
-                stop("valueA", fillOutlineColor(Color.RED))
-              )
-            ).withDefaultValue(fillOutlineColor(Color.GREEN))
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillOutlineColor());
-        assertNotNull(layer.getFillOutlineColor().getFunction());
-        assertEquals(SourceFunction.class, layer.getFillOutlineColor().getFunction().getClass());
-        assertEquals("FeaturePropertyA", ((SourceFunction) layer.getFillOutlineColor().getFunction()).getProperty());
-        assertEquals(CategoricalStops.class, layer.getFillOutlineColor().getFunction().getStops().getClass());
-        assertNotNull(((SourceFunction) layer.getFillOutlineColor().getFunction()).getDefaultValue());
-        assertNotNull(((SourceFunction) layer.getFillOutlineColor().getFunction()).getDefaultValue().getValue());
-        assertEquals(Color.GREEN, (int) ((SourceFunction) layer.getFillOutlineColor().getFunction()).getDefaultValue().getColorInt());
-      }
-    });
-
-  }
 
   @Test
   public void testFillOutlineColorAsIntConstant() {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-outline-color");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillOutlineColor(Color.RED));
-        assertEquals(layer.getFillOutlineColorAsInt(), Color.RED);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      layer.setProperties(fillOutlineColor(Color.RED));
+      assertEquals(layer.getFillOutlineColorAsInt(), Color.RED);
     });
   }
 
@@ -714,16 +287,13 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-translateTransitionOptions");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        TransitionOptions options = new TransitionOptions(300, 100);
-        layer.setFillTranslateTransition(options);
-        assertEquals(layer.getFillTranslateTransition(), options);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      TransitionOptions options = new TransitionOptions(300, 100);
+      layer.setFillTranslateTransition(options);
+      assertEquals(layer.getFillTranslateTransition(), options);
     });
   }
 
@@ -732,47 +302,12 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-translate");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillTranslate(new Float[] {0f, 0f}));
-        assertEquals((Float[]) layer.getFillTranslate().getValue(), (Float[]) new Float[] {0f, 0f});
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillTranslateAsCameraFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-translate");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillTranslate(
-            zoom(
-              exponential(
-                stop(2, fillTranslate(new Float[] {0f, 0f}))
-              ).withBase(0.5f)
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillTranslate());
-        assertNotNull(layer.getFillTranslate().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillTranslate().getFunction().getClass());
-        assertEquals(ExponentialStops.class, layer.getFillTranslate().getFunction().getStops().getClass());
-        assertEquals(0.5f, ((ExponentialStops) layer.getFillTranslate().getFunction().getStops()).getBase(), 0.001);
-        assertEquals(1, ((ExponentialStops) layer.getFillTranslate().getFunction().getStops()).size());
-      }
+      // Set and Get
+      layer.setProperties(fillTranslate(new Float[] {0f, 0f}));
+      assertEquals((Float[]) layer.getFillTranslate().getValue(), (Float[]) new Float[] {0f, 0f});
     });
   }
 
@@ -781,46 +316,12 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-translate-anchor");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillTranslateAnchor(FILL_TRANSLATE_ANCHOR_MAP));
-        assertEquals((String) layer.getFillTranslateAnchor().getValue(), (String) FILL_TRANSLATE_ANCHOR_MAP);
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillTranslateAnchorAsCameraFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-translate-anchor");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillTranslateAnchor(
-            zoom(
-              interval(
-                stop(2, fillTranslateAnchor(FILL_TRANSLATE_ANCHOR_MAP))
-              )
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillTranslateAnchor());
-        assertNotNull(layer.getFillTranslateAnchor().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillTranslateAnchor().getFunction().getClass());
-        assertEquals(IntervalStops.class, layer.getFillTranslateAnchor().getFunction().getStops().getClass());
-        assertEquals(1, ((IntervalStops) layer.getFillTranslateAnchor().getFunction().getStops()).size());
-      }
+      // Set and Get
+      layer.setProperties(fillTranslateAnchor(FILL_TRANSLATE_ANCHOR_MAP));
+      assertEquals((String) layer.getFillTranslateAnchor().getValue(), (String) FILL_TRANSLATE_ANCHOR_MAP);
     });
   }
 
@@ -829,16 +330,13 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-patternTransitionOptions");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        TransitionOptions options = new TransitionOptions(300, 100);
-        layer.setFillPatternTransition(options);
-        assertEquals(layer.getFillPatternTransition(), options);
-      }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
+
+      // Set and Get
+      TransitionOptions options = new TransitionOptions(300, 100);
+      layer.setFillPatternTransition(options);
+      assertEquals(layer.getFillPatternTransition(), options);
     });
   }
 
@@ -847,47 +345,12 @@ public class FillLayerTest extends BaseActivityTest {
     validateTestSetup();
     setupLayer();
     Timber.i("fill-pattern");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set and Get
-        layer.setProperties(fillPattern("pedestrian-polygon"));
-        assertEquals((String) layer.getFillPattern().getValue(), (String) "pedestrian-polygon");
-      }
-    });
-  }
+    invoke(mapboxMap, (uiController, mapboxMap) -> {
+      assertNotNull(layer);
 
-  @Test
-  public void testFillPatternAsCameraFunction() {
-    validateTestSetup();
-    setupLayer();
-    Timber.i("fill-pattern");
-    invoke(mapboxMap, new MapboxMapAction.OnInvokeActionListener() {
-      @Override
-      public void onInvokeAction(UiController uiController, MapboxMap mapboxMap) {
-        assertNotNull(layer);
-
-        // Set
-        layer.setProperties(
-          fillPattern(
-            zoom(
-              interval(
-                stop(2, fillPattern("pedestrian-polygon"))
-              )
-            )
-          )
-        );
-
-        // Verify
-        assertNotNull(layer.getFillPattern());
-        assertNotNull(layer.getFillPattern().getFunction());
-        assertEquals(CameraFunction.class, layer.getFillPattern().getFunction().getClass());
-        assertEquals(IntervalStops.class, layer.getFillPattern().getFunction().getStops().getClass());
-        assertEquals(1, ((IntervalStops) layer.getFillPattern().getFunction().getStops()).size());
-      }
+      // Set and Get
+      layer.setProperties(fillPattern("pedestrian-polygon"));
+      assertEquals((String) layer.getFillPattern().getValue(), (String) "pedestrian-polygon");
     });
   }
-
-}
+}
\ No newline at end of file