tests: add tests to ensure progress plugin is applied only once (#1777)

webpack · Aug 28, 2020 · fa1449c · fa1449c
1 parent e8f2f20
commit fa1449c
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Showing 4 changed files with 16 additions and 1 deletion.
diff --git a/test/progress/index.js b/test/progress/index.js
@@ -0,0 +1 @@
+console.log("Jotaro Kujo")
diff --git a/test/progress/progress-flag.test.js b/test/progress/progress-flag.test.js
@@ -9,4 +9,13 @@ describe('progress flag', () => {
         expect(stderr).toContain('[webpack.Progress] 100%');
         expect(stdout).toContain('main.js');
     });
+
+    it('should not add duplicate plugins', () => {
+        const { stderr, stdout, exitCode } = run(__dirname, ['-c', 'webpack.progress.config.js', '--progress']);
+        // Only 1 progress plugin should be applied to the compiler
+        expect(stdout.match(/ProgressPlugin/g)).toHaveLength(1);
+        expect(stderr).toContain('[webpack.Progress] 100%');
+        expect(stdout).toContain('main.js');
+        expect(exitCode).toEqual(0);
+    });
 });
diff --git a/test/progress/src/index.js b/test/progress/src/index.js
diff --git a/test/progress/webpack.progress.config.js b/test/progress/webpack.progress.config.js
@@ -0,0 +1,6 @@
+const { ProgressPlugin } = require('webpack');
+const WebpackCLITestPlugin = require('../utils/webpack-cli-test-plugin');
+
+module.exports = {
+    plugins: [new ProgressPlugin({}), new WebpackCLITestPlugin()],
+};