feat: add phase 4 bun_test bootstrap

tests/bun_test_test/BUILD.bazel

@@ -0,0 +1,19 @@
+load("//bun:defs.bzl", "bun_test")
+
+bun_test(
+    name = "passing_suite",
+    srcs = ["passing.test.ts"],
+    target_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:linux",
+    ],
+)
+
+bun_test(
+    name = "failing_suite",
+    srcs = ["failing.test.ts"],
+    target_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:linux",
+    ],
+)

tests/bun_test_test/failing.test.ts

@@ -0,0 +1,5 @@
+import { expect, test } from "bun:test";
+
+test("failing suite", () => {
+  expect(1 + 1).toBe(3);
+});

tests/bun_test_test/passing.test.ts

@@ -0,0 +1,5 @@
+import { expect, test } from "bun:test";
+
+test("passing suite", () => {
+  expect(1 + 1).toBe(2);
+});