Add tests for interaction event handlers

test/spec/ol/interaction/pointer.test.js

@@ -44,4 +44,95 @@ describe('ol.interaction.Pointer', function() {
 
   });
 
+  describe('event handlers', function() {
+    let handleDownCalled, handleDragCalled, handleMoveCalled, handleUpCalled;
+
+    const flagHandleDown = function() {
+      handleDownCalled = true;
+    };
+
+    const flagHandleDrag = function() {
+      handleDragCalled = true;
+    };
+
+    const flagHandleMove = function() {
+      handleMoveCalled = true;
+    };
+
+    const flagHandleUp = function() {
+      handleUpCalled = true;
+    };
+
+    class MockPointerInteraction extends PointerInteraction {
+      constructor() {
+        super(...arguments);
+      }
+      handleDownEvent(mapBrowserEvent) {
+        flagHandleDown();
+        return super.handleDownEvent(mapBrowserEvent);
+      }
+      handleDragEvent(mapBrowserEvent) {
+        flagHandleDrag();
+      }
+      handleMoveEvent(mapBrowserEvent) {
+        flagHandleMove();
+      }
+      handleUpEvent(mapBrowserEvent) {
+        flagHandleUp();
+        return super.handleUpEvent(mapBrowserEvent);
+      }
+    }
+
+    beforeEach(function() {
+      handleDownCalled = false;
+      handleDragCalled = false;
+      handleMoveCalled = false;
+      handleUpCalled = false;
+    });
+
+    it('has default event handlers', function() {
+      const interaction = new PointerInteraction({});
+      expect(interaction.handleDownEvent()).to.be(false);
+      expect(interaction.handleUpEvent()).to.be(false);
+    });
+
+    it('allows event handler overrides via options', function() {
+      const interaction = new PointerInteraction({
+        handleDownEvent: flagHandleDown,
+        handleDragEvent: flagHandleDrag,
+        handleMoveEvent: flagHandleMove,
+        handleUpEvent: flagHandleUp
+      });
+
+      interaction.handleDownEvent();
+      expect(handleDownCalled).to.be(true);
+
+      interaction.handleDragEvent();
+      expect(handleDragCalled).to.be(true);
+
+      interaction.handleMoveEvent();
+      expect(handleMoveCalled).to.be(true);
+
+      interaction.handleUpEvent();
+      expect(handleUpCalled).to.be(true);
+    });
+
+    it('allows event handler overrides via class extension', function() {
+      const interaction = new MockPointerInteraction({});
+
+      interaction.handleDownEvent();
+      expect(handleDownCalled).to.be(true);
+
+      interaction.handleDragEvent();
+      expect(handleDragCalled).to.be(true);
+
+      interaction.handleMoveEvent();
+      expect(handleMoveCalled).to.be(true);
+
+      interaction.handleUpEvent();
+      expect(handleUpCalled).to.be(true);
+    });
+
+  });
+
 });