Add basic tests for the test command.

Author: Robert Jackson

tests/cli-test.js

@@ -1,3 +1,4 @@
+const fs = require('fs-extra');
 const path = require('path');
 /*eslint-disable node/no-unpublished-require */
 const createTempDir = require('broccoli-test-helper').createTempDir;
@@ -6,7 +7,8 @@ const execa = require('execa');
 const walkSync = require('walk-sync');
 /*eslint-enable*/
 
-const EXECUTABLE_PATH = path.join(__dirname, '..', 'bin', 'cli.js');
+const PROJECT_ROOT = path.join(__dirname, '..');
+const EXECUTABLE_PATH = path.join(PROJECT_ROOT, 'bin', 'cli.js');
 const ROOT = process.cwd();
 
 QUnit.module('codemod-cli', function(hooks) {
@@ -64,6 +66,11 @@ QUnit.module('codemod-cli', function(hooks) {
 
     hooks.beforeEach(function() {
       input.copy(project.path('test-project'));
+
+      // setup required dependencies in the project
+      fs.ensureDirSync(`${input.path()}/node_modules`);
+      fs.symlinkSync(`${ROOT}/node_modules/jest`, `${input.path()}/node_modules/jest`);
+      fs.symlinkSync(PROJECT_ROOT, `${input.path()}/node_modules/codemod-cli`);
     });
 
     QUnit.module('codemod', function() {
@@ -110,5 +117,43 @@ QUnit.module('codemod-cli', function(hooks) {
         })
       );
     });
+
+    QUnit.module('test', function() {
+      QUnit.test(
+        'should pass for a basic project with an empty codemod',
+        wrap(function*(assert) {
+          yield execa(EXECUTABLE_PATH, ['generate', 'codemod', 'main']);
+          yield execa(EXECUTABLE_PATH, ['generate', 'fixture', 'main', 'this-dot-owner']);
+
+          let result = yield execa(EXECUTABLE_PATH, ['test']);
+          assert.equal(result.code, 0, 'exited with zero');
+        })
+      );
+
+      QUnit.test(
+        'should fail when input and output do not match',
+        wrap(function*(assert) {
+          yield execa(EXECUTABLE_PATH, ['generate', 'codemod', 'main']);
+          yield execa(EXECUTABLE_PATH, ['generate', 'fixture', 'main', 'this-dot-owner']);
+
+          input.write({
+            transforms: {
+              main: {
+                __testfixtures__: {
+                  'basic.input.js': '"starting content";',
+                  'basic.output.js': '"different content";',
+                },
+              },
+            },
+          });
+
+          try {
+            yield execa(EXECUTABLE_PATH, ['test']);
+          } catch (result) {
+            assert.notEqual(result.code, 0, 'exited with non-zero');
+          }
+        })
+      );
+    });
   });
 });