Ensure instructions edits set updated timestamp

Author: greenberga

src/actions/projects.js

@@ -21,6 +21,7 @@ export const updateProjectSource = createAction(
 export const updateProjectInstructions = createAction(
   'UPDATE_PROJECT_INSTRUCTIONS',
   (projectKey, newValue) => ({projectKey, newValue}),
+  (_projectKey, _newValue, timestamp = Date.now()) => ({timestamp}),
 );
 
 export const toggleLibrary = createAction(

src/reducers/projects.js

@@ -119,6 +119,9 @@ export default function reduceProjects(stateIn, action) {
       return state.setIn(
         [action.payload.projectKey, 'instructions'],
         action.payload.newValue,
+      ).setIn(
+        [action.payload.projectKey, 'updatedAt'],
+        action.meta.timestamp,
       );
 
     case 'PROJECT_CREATED':

test/unit/reducers/projects.js

@@ -66,16 +66,16 @@ test('updateProjectSource', reducerTest(
     ),
 ));
 
-tap(initProjects({1: false}), projects =>
-  test('updateProjectInstructions', reducerTest(
-    reducer,
-    projects,
-    partial(updateProjectInstructions, '1', '# Instructions\n\nHello.'),
-    projects.update('1', projectIn =>
-      projectIn.set('instructions', '# Instructions\n\nHello.'),
+test('updateProjectInstructions', reducerTest(
+  reducer,
+  initProjects({[projectKey]: false}),
+  partial(updateProjectInstructions, projectKey, '# Instructions', now),
+  initProjects({[projectKey]: true}).
+    update(
+      projectKey,
+      editedProject => editedProject.set('instructions', '# Instructions'),
     ),
-  )),
-);
+));
 
 test('changeCurrentProject', (t) => {
   t.test('from modified to pristine', reducerTest(