Fix assertEquals for RegExp & Date (denoland/deno_std#305)

Original: https://github.com/denoland/deno_std/commit/e17364b91fb5360624e9529ed26cb3c6f0ca6a38

2 files changed, 14 insertions, 0 deletions

diff --git a/testing/asserts.ts b/testing/asserts.ts
index 6d975bbb5..eb5e11969 100644
--- a/testing/asserts.ts
+++ b/testing/asserts.ts
@@ -16,6 +16,16 @@ export class AssertionError extends Error {
 export function equal(c: unknown, d: unknown): boolean {
   const seen = new Map();
   return (function compare(a: unknown, b: unknown) {
+    // Have to render RegExp & Date for string comparison
+    // unless it's mistreated as object
+    if (
+      a &&
+      b &&
+      ((a instanceof RegExp && b instanceof RegExp) ||
+        (a instanceof Date && b instanceof Date))
+    ) {
+      return String(a) === String(b);
+    }
     if (Object.is(a, b)) {
       return true;
     }
diff --git a/testing/asserts_test.ts b/testing/asserts_test.ts
index 6f82d4169..87e0335ac 100644
--- a/testing/asserts_test.ts
+++ b/testing/asserts_test.ts
@@ -36,6 +36,10 @@ test(function testingEqual() {
       { hello: "world", hi: { there: "everyone else" } }
     )
   );
+  assert(equal(/deno/, /deno/));
+  assert(!equal(/deno/, /node/));
+  assert(equal(new Date(2019, 0, 3), new Date(2019, 0, 3)));
+  assert(!equal(new Date(2019, 0, 3), new Date(2019, 1, 3)));
 });
 
 test(function testingNotEquals() {