feat(schematics): run tests for affected apps

Add support for affected:test that works similar to the e2e
target except it runs test instead.  Theoretically useful
for a CI process to run the unit tests based on the apps
affected by the change.

This is WIP towards Issue nrwl#416

e2e/schematics/command-line.test.ts

@@ -160,6 +160,11 @@ describe('Command line', () => {
         'npm run affected:e2e -- --files="libs/mylib/index.ts"'
       );
       expect(e2e).toContain('should display welcome message');
+
+      const test = runCommand(
+        'npm run affected:test -- --files="libs/mylib/index.ts"'
+      );
+      expect(test).toContain('should display welcome message');
     },
     1000000
   );

packages/bazel/src/collection/application/files/__directory__/package.json

@@ -12,6 +12,7 @@
     "affected:apps": "./node_modules/.bin/nx affected apps",
     "affected:build": "./node_modules/.bin/nx affected build",
     "affected:e2e": "./node_modules/.bin/nx affected e2e",
+    "affected:test": "./node_modules/.bin/nx affected test",
     "affected:dep-graph": "./node_modules/.bin/nx affected dep-graph",
     "format": "./node_modules/.bin/nx format write",
     "format:write": "./node_modules/.bin/nx format write",

packages/schematics/migrations/20180410-adding-affected-test.ts

@@ -0,0 +1,13 @@
+import { updateJsonFile } from '../src/utils/fileutils';
+
+export default {
+  description: 'Update npm scripts to use the nx command',
+  run: () => {
+    updateJsonFile('package.json', json => {
+      json.scripts = {
+        ...json.scripts,
+        'affected:test': './node_modules/.bin/nx affected test'
+      };
+    });
+  }
+};

packages/schematics/src/collection/application/files/__directory__/package.json

@@ -12,6 +12,7 @@
     "affected:apps": "./node_modules/.bin/nx affected apps",
     "affected:build": "./node_modules/.bin/nx affected build",
     "affected:e2e": "./node_modules/.bin/nx affected e2e",
+    "affected:test": "./node_modules/.bin/nx affected test",
     "affected:dep-graph": "./node_modules/.bin/nx affected dep-graph",
     "format": "./node_modules/.bin/nx format write",
     "format:write": "./node_modules/.bin/nx format write",

packages/schematics/src/collection/workspace/index.ts

@@ -84,6 +84,8 @@ function updatePackageJson() {
     packageJson.scripts['affected:build'] =
       './node_modules/.bin/nx affected build';
     packageJson.scripts['affected:e2e'] = './node_modules/.bin/nx affected e2e';
+    packageJson.scripts['affected:test'] =
+      './node_modules/.bin/nx affected test';
 
     packageJson.scripts['affected:dep-graph'] =
       './node_modules/.bin/nx affected dep-graph';

packages/schematics/src/command-line/affected.ts

@@ -29,7 +29,10 @@ export function affected(args: string[]): void {
       build(apps, rest);
       break;
     case 'e2e':
-      e2e(apps, rest);
+      runTests('e2e', apps, rest);
+      break;
+    case 'test':
+      runTests('test', apps, rest);
       break;
     case 'dep-graph':
       generateGraph(yargsParser(rest), projects);
@@ -77,11 +80,11 @@ function build(apps: string[], rest: string[]) {
   }
 }
 
-function e2e(apps: string[], rest: string[]) {
+function runTests(type: string, apps: string[], rest: string[]) {
   if (apps.length > 0) {
     console.log(`Testing ${apps.join(', ')}`);
     apps.forEach(app => {
-      execSync(`node ${ngPath()} e2e ${rest.join(' ')} -a=${app}`, {
+      execSync(`node ${ngPath()} ${type} ${rest.join(' ')} -a=${app}`, {
         stdio: [0, 1, 2]
       });
     });