Move droplab hook_spec tests to jest

- jest test
- remove karma test

spec/frontend/droplab/hook_spec.js

+import Hook from '~/droplab/hook';
+import DropDown from '~/droplab/drop_down';
+
+jest.mock('~/droplab/drop_down', () => jest.fn());
+
+describe('Hook', () => {
+  let testContext;
+
+  beforeEach(() => {
+    testContext = {};
+  });
+
+  describe('class constructor', () => {
+    beforeEach(() => {
+      testContext.trigger = { id: 'id' };
+      testContext.list = {};
+      testContext.plugins = {};
+      testContext.config = {};
+
+      testContext.hook = new Hook(
+        testContext.trigger,
+        testContext.list,
+        testContext.plugins,
+        testContext.config,
+      );
+    });
+
+    it('should set .trigger', () => {
+      expect(testContext.hook.trigger).toBe(testContext.trigger);
+    });
+
+    it('should set .list', () => {
+      expect(testContext.hook.list).toEqual({});
+    });
+
+    it('should call DropDown constructor', () => {
+      expect(DropDown).toHaveBeenCalledWith(testContext.list, testContext.config);
+    });
+
+    it('should set .type', () => {
+      expect(testContext.hook.type).toBe('Hook');
+    });
+
+    it('should set .event', () => {
+      expect(testContext.hook.event).toBe('click');
+    });
+
+    it('should set .plugins', () => {
+      expect(testContext.hook.plugins).toBe(testContext.plugins);
+    });
+
+    it('should set .config', () => {
+      expect(testContext.hook.config).toBe(testContext.config);
+    });
+
+    it('should set .id', () => {
+      expect(testContext.hook.id).toBe(testContext.trigger.id);
+    });
+
+    describe('if config argument is undefined', () => {
+      beforeEach(() => {
+        testContext.config = undefined;
+
+        testContext.hook = new Hook(
+          testContext.trigger,
+          testContext.list,
+          testContext.plugins,
+          testContext.config,
+        );
+      });
+
+      it('should set .config to an empty object', () => {
+        expect(testContext.hook.config).toEqual({});
+      });
+    });
+
+    describe('if plugins argument is undefined', () => {
+      beforeEach(() => {
+        testContext.plugins = undefined;
+
+        testContext.hook = new Hook(
+          testContext.trigger,
+          testContext.list,
+          testContext.plugins,
+          testContext.config,
+        );
+      });
+
+      it('should set .plugins to an empty array', () => {
+        expect(testContext.hook.plugins).toEqual([]);
+      });
+    });
+  });
+});

spec/javascripts/droplab/hook_spec.js

-import Hook from '~/droplab/hook';
-
-describe('Hook', function() {
-  describe('class constructor', function() {
-    beforeEach(function() {
-      this.trigger = { id: 'id' };
-      this.list = {};
-      this.plugins = {};
-      this.config = {};
-      this.dropdown = {};
-
-      this.dropdownConstructor = spyOnDependency(Hook, 'DropDown').and.returnValue(this.dropdown);
-
-      this.hook = new Hook(this.trigger, this.list, this.plugins, this.config);
-    });
-
-    it('should set .trigger', function() {
-      expect(this.hook.trigger).toBe(this.trigger);
-    });
-
-    it('should set .list', function() {
-      expect(this.hook.list).toBe(this.dropdown);
-    });
-
-    it('should call DropDown constructor', function() {
-      expect(this.dropdownConstructor).toHaveBeenCalledWith(this.list, this.config);
-    });
-
-    it('should set .type', function() {
-      expect(this.hook.type).toBe('Hook');
-    });
-
-    it('should set .event', function() {
-      expect(this.hook.event).toBe('click');
-    });
-
-    it('should set .plugins', function() {
-      expect(this.hook.plugins).toBe(this.plugins);
-    });
-
-    it('should set .config', function() {
-      expect(this.hook.config).toBe(this.config);
-    });
-
-    it('should set .id', function() {
-      expect(this.hook.id).toBe(this.trigger.id);
-    });
-
-    describe('if config argument is undefined', function() {
-      beforeEach(function() {
-        this.config = undefined;
-
-        this.hook = new Hook(this.trigger, this.list, this.plugins, this.config);
-      });
-
-      it('should set .config to an empty object', function() {
-        expect(this.hook.config).toEqual({});
-      });
-    });
-
-    describe('if plugins argument is undefined', function() {
-      beforeEach(function() {
-        this.plugins = undefined;
-
-        this.hook = new Hook(this.trigger, this.list, this.plugins, this.config);
-      });
-
-      it('should set .plugins to an empty array', function() {
-        expect(this.hook.plugins).toEqual([]);
-      });
-    });
-  });
-});