1 files changed, 54 insertions, 0 deletions
diff --git a/tests/unit/error_stack_test.ts b/tests/unit/error_stack_test.ts
new file mode 100644
index 000000000..7188b9f53
--- /dev/null
+++ b/tests/unit/error_stack_test.ts
@@ -0,0 +1,54 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals, assertMatch } from "./test_util.ts";
+
+Deno.test(function errorStackMessageLine() {
+  const e1 = new Error();
+  e1.name = "Foo";
+  e1.message = "bar";
+  assertMatch(e1.stack!, /^Foo: bar\n/);
+
+  const e2 = new Error();
+  e2.name = "";
+  e2.message = "bar";
+  assertMatch(e2.stack!, /^bar\n/);
+
+  const e3 = new Error();
+  e3.name = "Foo";
+  e3.message = "";
+  assertMatch(e3.stack!, /^Foo\n/);
+
+  const e4 = new Error();
+  e4.name = "";
+  e4.message = "";
+  assertMatch(e4.stack!, /^\n/);
+
+  const e5 = new Error();
+  // deno-lint-ignore ban-ts-comment
+  // @ts-expect-error
+  e5.name = undefined;
+  // deno-lint-ignore ban-ts-comment
+  // @ts-expect-error
+  e5.message = undefined;
+  assertMatch(e5.stack!, /^Error\n/);
+
+  const e6 = new Error();
+  // deno-lint-ignore ban-ts-comment
+  // @ts-expect-error
+  e6.name = null;
+  // deno-lint-ignore ban-ts-comment
+  // @ts-expect-error
+  e6.message = null;
+  assertMatch(e6.stack!, /^null: null\n/);
+});
+
+Deno.test(function captureStackTrace() {
+  function foo() {
+    const error = new Error();
+    const stack1 = error.stack!;
+    Error.captureStackTrace(error, foo);
+    const stack2 = error.stack!;
+    // stack2 should be stack1 without the first frame.
+    assertEquals(stack2, stack1.replace(/(?<=^[^\n]*\n)[^\n]*\n/, ""));
+  }
+  foo();
+});