Adds js/unit_tests.ts (#448)

js/testing/testing.ts

@@ -0,0 +1,96 @@
+/*!
+   Copyright 2018 Propel http://propel.site/.  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.
+*/
+
+export { assert, assertEqual, equal } from "./util.ts";
+
+export type TestFunction = () => void | Promise<void>;
+
+export interface TestDefinition {
+  fn: TestFunction;
+  name: string;
+}
+
+export const exitOnFail = true;
+
+/* A subset of the tests can be ran by providing a filter expression.
+ * In Node.js the filter is specified on the command line:
+ *
+ *   ts-node test_node log        # all tests with 'log' in the name
+ *   ts-node test_node ^util      # tests starting with 'util'
+ *
+ * In the browser, the filter is specified as part of the url:
+ *
+ *   http://localhost:9876/test.html#script=some/script.js&filter=log
+ *   http://localhost:9876/test.html#script=some/script.js&filter=^util
+ */
+let filterExpr: string = null;
+
+const filterRegExp = filterExpr ? new RegExp(filterExpr, "i") : null;
+const tests: TestDefinition[] = [];
+
+export function test(t: TestDefinition | TestFunction): void {
+  const fn: TestFunction = typeof t === "function" ? t : t.fn;
+  const name: string = t.name;
+
+  if (!name) {
+    throw new Error("Test function may not be anonymous");
+  }
+  if (filter(name)) {
+    tests.push({ fn, name });
+  }
+}
+
+function filter(name: string): boolean {
+  if (filterRegExp) {
+    return filterRegExp.test(name);
+  } else {
+    return true;
+  }
+}
+
+async function runTests() {
+  let passed = 0;
+  let failed = 0;
+
+  for (let i = 0; i < tests.length; i++) {
+    const { fn, name } = tests[i];
+    console.log(`${i + 1}/${tests.length} +${passed} -${failed}: ${name}`);
+    try {
+      await fn();
+      passed++;
+    } catch (e) {
+      console.error("\nTest FAIL", name);
+      console.error((e && e.stack) || e);
+      failed++;
+      if (exitOnFail) {
+        break;
+      }
+    }
+  }
+
+  console.log(`\nDONE. Test passed: ${passed}, failed: ${failed}`);
+
+  if (failed === 0) {
+    // All good.
+  } else {
+    // Use setTimeout to avoid the error being ignored due to unhandled
+    // promise rejections being swallowed.
+    setTimeout(() => {
+      throw new Error(`There were ${failed} test failures.`);
+    }, 0);
+  }
+}
+
+setTimeout(runTests, 0);