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web-test-runner.config.js

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+// import { playwrightLauncher } from '@web/test-runner-playwright';
+
+const filteredLogs = ['Running in dev mode', 'Lit is in dev mode'];
+
+export default /** @type {import("@web/test-runner").TestRunnerConfig} */ ({
+  /** Test files to run */
+  files: 'out-tsc/test/**/*.test.js',
+
+  /** Resolve bare module imports */
+  nodeResolve: {
+    exportConditions: ['browser', 'development'],
+  },
+
+  /** Filter out lit dev mode logs */
+  filterBrowserLogs(log) {
+    for (const arg of log.args) {
+      if (typeof arg === 'string' && filteredLogs.some(l => arg.includes(l))) {
+        return false;
+      }
+    }
+    return true;
+  },
+
+  /** Compile JS for older browsers. Requires @web/dev-server-esbuild plugin */
+  // esbuildTarget: 'auto',
+
+  /** Amount of browsers to run concurrently */
+  // concurrentBrowsers: 2,
+
+  /** Amount of test files per browser to test concurrently */
+  // concurrency: 1,
+
+  /** Browsers to run tests on */
+  // browsers: [
+  //   playwrightLauncher({ product: 'chromium' }),
+  //   playwrightLauncher({ product: 'firefox' }),
+  //   playwrightLauncher({ product: 'webkit' }),
+  // ],
+
+  // See documentation for all available options
+});