1 files changed, 31 insertions, 0 deletions
diff --git a/remote/test/puppeteer/src/util/assert.ts b/remote/test/puppeteer/src/util/assert.ts
new file mode 100644
index 0000000000..bd8b10e731
--- /dev/null
+++ b/remote/test/puppeteer/src/util/assert.ts
@@ -0,0 +1,31 @@
+/**
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Asserts that the given value is truthy.
+ * @param value - some conditional statement
+ * @param message - the error message to throw if the value is not truthy.
+ *
+ * @internal
+ */
+export const assert: (value: unknown, message?: string) => asserts value = (
+  value,
+  message
+) => {
+  if (!value) {
+    throw new Error(message);
+  }
+};