development/#81 add unit tests for filtersReducer (#105)

resolved #81

src/app/worklogs/reducers/filters.reducer.spec.ts

@@ -0,0 +1,67 @@
+import * as filtersActions from '../actions/filters.actions';
+import { filtersReducer } from './filters.reducer';
+
+describe('filtersReducer', () => {
+
+  describe('when reducer doesnt get any params', () => {
+
+    it('shoud return default state', () => {
+
+      const emptyAction = { type: '' } as any;
+      expect(filtersReducer(undefined, emptyAction)).toEqual({ model: {} })
+
+    });
+
+  });
+
+  describe('when reducer get UPDATE action with out state', () => {
+
+    it('should return value with new element from payload', () => {
+
+      const state = { model: {} };
+      const actionPayload = { keywords: 'test keywords' };
+      const action = new filtersActions.Update(actionPayload);
+      const result = filtersReducer(state, action);
+      const expected = { model: actionPayload };
+
+      expect(result).toEqual(expected);
+
+    });
+
+  });
+
+  describe('when reducer get UPDATE action', () => {
+
+    it('should return value with new element from payload', () => {
+
+      const state = { model: {} };
+      const actionPayload = { keywords: 'test keywords' };
+      const action = new filtersActions.Update(actionPayload);
+      const result = filtersReducer(state, action);
+      const expected = { model: actionPayload };
+
+      expect(result).toEqual(expected);
+
+    });
+
+  });
+
+  describe('when reducer get UPDATE action', () => {
+
+    it('should return value with updated element from payload', () => {
+
+      const state = { model: { keywords: 'old value' } };
+      const actionPayload = { keywords: 'new value' };
+      const action = new filtersActions.Update(actionPayload);
+      const result = filtersReducer(state, action);
+      const expected = { model: actionPayload };
+
+      expect(result).toEqual(expected);
+
+    });
+
+  });
+
+});
+
+