test: escaped in selector

test/__snapshots__/modules-option.test.js.snap

@@ -6355,6 +6355,33 @@ exports.locals = {
 
 exports[`modules issue #861: warnings 1`] = `Array []`;
 
+exports[`modules issue #966: errors 1`] = `Array []`;
+
+exports[`modules issue #966: module (evaluated) 1`] = `
+Array [
+  Array [
+    1,
+    ".button.hey {
+  color: red;
+}
+",
+    "",
+  ],
+]
+`;
+
+exports[`modules issue #966: module 1`] = `
+"exports = module.exports = require(\\"../../../../src/runtime/api.js\\")(false);
+// Module
+exports.push([module.id, \\".button.hey {\\\\n  color: red;\\\\n}\\\\n\\", \\"\\"]);
+// Exports
+exports.locals = {
+	\\"button\\": \\"button.hey\\"
+};"
+`;
+
+exports[`modules issue #966: warnings 1`] = `Array []`;
+
 exports[`modules issue #967: errors 1`] = `Array []`;
 
 exports[`modules issue #967: module (evaluated) 1`] = `

test/fixtures/modules/issue-966/button.css

@@ -0,0 +1,3 @@
+.button {
+  color: red;
+}

test/fixtures/modules/issue-966/toolbar.css

@@ -0,0 +1,5 @@
+@value btn from './button.css';
+
+.toolbar > btn {
+  color: red
+}

test/modules-option.test.js

@@ -485,4 +485,28 @@ describe('modules', () => {
     expect(stats.compilation.warnings).toMatchSnapshot('warnings');
     expect(stats.compilation.errors).toMatchSnapshot('errors');
   });
+
+  it('issue #966', async () => {
+    const config = {
+      loader: {
+        options: {
+          modules: {
+            getLocalIdent: (ctx, localIdentName, localName) =>
+              `${localName}.hey`,
+          },
+        },
+      },
+    };
+    const testId = './modules/issue-966/button.css';
+    const stats = await webpack(testId, config);
+    const { modules } = stats.toJson();
+    const module = modules.find((m) => m.id === testId);
+
+    expect(module.source).toMatchSnapshot('module');
+    expect(evaluated(module.source, modules)).toMatchSnapshot(
+      'module (evaluated)'
+    );
+    expect(stats.compilation.warnings).toMatchSnapshot('warnings');
+    expect(stats.compilation.errors).toMatchSnapshot('errors');
+  });
 });