Adds js/unit_tests.ts (#448)

js/testing/util.ts

@@ -0,0 +1,64 @@
+/*!
+   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.
+ */
+
+// TODO(ry) Use unknown here for parameters types.
+// tslint:disable-next-line:no-any
+export function assertEqual(actual: any, expected: any, msg?: string) {
+  if (!msg) {
+    msg = `actual: ${actual} expected: ${expected}`;
+  }
+  if (!equal(actual, expected)) {
+    console.error(
+      "assertEqual failed. actual = ",
+      actual,
+      "expected =",
+      expected
+    );
+    throw new Error(msg);
+  }
+}
+
+export function assert(expr: boolean, msg = "") {
+  if (!expr) {
+    throw new Error(msg);
+  }
+}
+
+// TODO(ry) Use unknown here for parameters types.
+// tslint:disable-next-line:no-any
+export function equal(c: any, d: any): boolean {
+  const seen = new Map();
+  return (function compare(a, b) {
+    if (Object.is(a, b)) {
+      return true;
+    }
+    if (a && typeof a === "object" && b && typeof b === "object") {
+      if (seen.get(a) === b) {
+        return true;
+      }
+      if (Object.keys(a).length !== Object.keys(b).length) {
+        return false;
+      }
+      for (const key in { ...a, ...b }) {
+        if (!compare(a[key], b[key])) {
+          return false;
+        }
+      }
+      seen.set(a, b);
+      return true;
+    }
+    return false;
+  })(c, d);
+}