tests: Add test coverage for composeReducer() function. Refs #40

src/test/SmartComponents/redux/reducers.test.js

@@ -0,0 +1,34 @@
+import { composeReducer } from '../../../SmartComponents/redux/reducers';
+import types from '../../../SmartComponents/redux/types';
+
+const compose = {
+    'xxxx-xxxx-xxxx-xxxx': {
+        state: 'uploading',
+        distribution: 'fedora-31',
+        architecture: 'x86_64',
+        image_type: 'qcow2'
+    }
+};
+
+describe('composeReducer', () => {
+    test('returns state for unknown actions', () => {
+        const result = composeReducer({}, {
+            type: 'THIS-IS-UNKNOWN',
+        });
+
+        expect(result).toEqual({});
+    });
+
+    test('returns updates state for types.UPDATE_COMPOSE', () => {
+        const state = {
+            testAttr: 'test-me'
+        };
+        const result = composeReducer(state, {
+            type: types.UPDATE_COMPOSE,
+            compose
+        });
+
+        expect(result.testAttr).toBe('test-me');
+        expect(result['xxxx-xxxx-xxxx-xxxx']).toEqual(compose['xxxx-xxxx-xxxx-xxxx']);
+    });
+});