Integration test added

packages/core/integration-tests/test/integration/postcss-modules-config/.postcssrc

@@ -0,0 +1,6 @@
+{
+    "modules": true,
+    "plugins": {
+        "postcss-modules": {}
+    }
+}

packages/core/integration-tests/test/integration/postcss-modules-config/foo.css

@@ -0,0 +1,3 @@
+.foo {
+  color: #fff;
+}

packages/core/integration-tests/test/integration/postcss-modules-config/foo.js

@@ -0,0 +1,5 @@
+const map = require('./foo.css');
+
+module.exports = {
+  foo: map.foo,
+};

packages/core/integration-tests/test/integration/postcss-modules-config/index.css

@@ -0,0 +1,3 @@
+body {
+  background: blue;
+}

packages/core/integration-tests/test/integration/postcss-modules-config/index.js

@@ -0,0 +1,6 @@
+require('./index.css');
+var foo = require('./foo');
+
+module.exports = function () {
+  return foo.foo;
+};

packages/core/integration-tests/test/postcss.js

@@ -45,6 +45,34 @@ describe('postcss', () => {
     assert(css.includes(`.${cssClass}`));
   });
 
+  it('should build successfully with only postcss-modules config', async () => {
+    let b = await bundle(
+      path.join(__dirname, '/integration/postcss-modules-config/index.js'),
+    );
+
+    assertBundles(b, [
+      {
+        name: 'index.js',
+        assets: ['foo.css', 'foo.js', 'index.css', 'index.js'],
+      },
+      {
+        name: 'index.css',
+        assets: ['foo.css', 'index.css'],
+      },
+    ]);
+
+    let output = await run(b);
+    assert.equal(typeof output, 'function');
+
+    let value = output();
+    assert(/_foo_[0-9a-z]/.test(value));
+
+    let cssClass = value.match(/(_foo_[0-9a-z])/)[1];
+
+    let css = await outputFS.readFile(path.join(distDir, 'index.css'), 'utf8');
+    assert(css.includes(`.${cssClass}`));
+  });
+
   it('should support transforming css modules with postcss (import default)', async () => {
     let b = await bundle(
       path.join(