fix: Format non-error exceptions (#14604)

This commit adds "Deno.core.setFormatExceptionCallback" which
can be used to provide custom formatting for errors. It is useful
in cases when user throws something that is non-Error (eg.
a string, plain object, etc).

1 files changed, 23 insertions, 0 deletions

diff --git a/cli/tests/testdata/test/non_error_thrown.ts b/cli/tests/testdata/test/non_error_thrown.ts
new file mode 100644
index 000000000..85dc8d179
--- /dev/null
+++ b/cli/tests/testdata/test/non_error_thrown.ts
@@ -0,0 +1,23 @@
+Deno.test("foo", () => {
+  throw undefined;
+});
+
+Deno.test("bar", () => {
+  throw null;
+});
+
+Deno.test("baz", () => {
+  throw 123;
+});
+
+Deno.test("qux", () => {
+  throw "Hello, world!";
+});
+
+Deno.test("quux", () => {
+  throw [1, 2, 3];
+});
+
+Deno.test("quuz", () => {
+  throw { a: "Hello, world!", b: [1, 2, 3] };
+});