Add tests for ComposableObservableStore

2 files changed, 46 insertions, 11 deletions

diff --git a/app/scripts/lib/ComposableObservableStore.js b/app/scripts/lib/ComposableObservableStore.js
index 688594b6d..d5ee708a1 100644
--- a/app/scripts/lib/ComposableObservableStore.js
+++ b/app/scripts/lib/ComposableObservableStore.js
@@ -11,24 +11,24 @@ class ComposableObservableStore extends ObservableStore {
    * @param {Object} [initState] - The initial store state
    * @param {Object} [config] - Map of internal state keys to child stores
    */
-	constructor (initState, config) {
-		super()
-		this.updateStructure(config)
-	}
+  constructor (initState, config) {
+    super(initState)
+    this.updateStructure(config)
+  }
 
   /**
    * Composes a new internal store subscription structure
    *
    * @param {Object} [config] - Map of internal state keys to child stores
    */
-	updateStructure (config) {
+  updateStructure (config) {
     this.config = config
-		this.removeAllListeners()
-		for (const key in config) {
-			config[key].subscribe((state) => {
-				this.updateState({ [key]: state })
-			})
-		}
+    this.removeAllListeners()
+    for (const key in config) {
+      config[key].subscribe((state) => {
+        this.updateState({ [key]: state })
+      })
+    }
   }
 
   /**
diff --git a/test/unit/ComposableObservableStore.js b/test/unit/ComposableObservableStore.js
new file mode 100644
index 000000000..3fba200c1
--- /dev/null
+++ b/test/unit/ComposableObservableStore.js
@@ -0,0 +1,35 @@
+const assert = require('assert')
+const ComposableObservableStore = require('../../app/scripts/lib/ComposableObservableStore')
+const ObservableStore = require('obs-store')
+
+describe('ComposableObservableStore', () => {
+  it('should register initial state', () => {
+    const store = new ComposableObservableStore('state')
+    assert.strictEqual(store.getState(), 'state')
+  })
+
+  it('should register initial structure', () => {
+    const testStore = new ObservableStore()
+    const store = new ComposableObservableStore(null, { TestStore: testStore })
+    testStore.putState('state')
+    assert.deepEqual(store.getState(), { TestStore: 'state' })
+  })
+
+  it('should update structure', () => {
+    const testStore = new ObservableStore()
+    const store = new ComposableObservableStore()
+    store.updateStructure({ TestStore: testStore })
+    testStore.putState('state')
+    assert.deepEqual(store.getState(), { TestStore: 'state' })
+  })
+
+  it('should return flattened state', () => {
+    const fooStore = new ObservableStore({ foo: 'foo' })
+    const barStore = new ObservableStore({ bar: 'bar' })
+    const store = new ComposableObservableStore(null, {
+      FooStore: fooStore,
+      BarStore: barStore,
+    })
+    assert.deepEqual(store.getFlatState(), { foo: 'foo', bar: 'bar' })
+  })
+})