fix(tui): prevented test env from suppressing interactive launch

Scoped test-runtime detection to explicit runner markers and Bun test entrypoints, so application NODE_ENV/BUN_ENV values no longer make ProcessTerminal headless.

Added subprocess regression coverage and propagated the private marker to test children.

Fixes #7261

packages/utils/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed Bun test-runtime detection treating application-owned `NODE_ENV=test` and `BUN_ENV=test` values as test-runner signals ([#7261](https://github.com/can1357/oh-my-pi/issues/7261)).
+
 ## [17.2.1] - 2026-07-30
 
 ### Added

packages/utils/src/env.ts

@@ -258,9 +258,13 @@ export function $envpos(name: string, defaultValue: number): number {
 	return parsed;
 }
 
-/** True when `BUN_ENV` or `NODE_ENV` is the string `test`. */
+const BUN_TEST_ENTRY_PATTERN = /\.(?:test|spec)\.[cm]?[jt]sx?$/;
+
+/** True when the process is an explicitly marked test child or Bun is running a test entrypoint. */
 export function isBunTestRuntime(): boolean {
-	return Bun.env.BUN_ENV === "test" || Bun.env.NODE_ENV === "test";
+	if (Bun.env.PI_TEST_RUNTIME === "1") return true;
+	const hasTestEnvironment = Bun.env.BUN_ENV === "test" || Bun.env.NODE_ENV === "test";
+	return hasTestEnvironment && BUN_TEST_ENTRY_PATTERN.test(Bun.main);
 }
 
 let terminalHeadless = isBunTestRuntime();

packages/utils/test/env.test.ts

@@ -5,6 +5,7 @@ import * as path from "node:path";
 import { filterProcessEnv, parseEnvFile } from "@oh-my-pi/pi-utils/env";
 
 const tempDirs: string[] = [];
+const runtimeProbePath = path.join(import.meta.dir, "fixtures", "test-runtime-probe.ts");
 
 afterEach(() => {
 	for (const dir of tempDirs.splice(0)) {
@@ -20,6 +21,23 @@ function writeTempEnv(content: string): string {
 	return filePath;
 }
 
+async function runRuntimeProbe(env: Record<string, string | undefined>): Promise<boolean> {
+	const cwd = path.dirname(writeTempEnv(""));
+	const proc = Bun.spawn([process.execPath, runtimeProbePath], {
+		cwd,
+		env: { ...process.env, ...env },
+		stdout: "pipe",
+		stderr: "pipe",
+	});
+	const [stdout, stderr, exitCode] = await Promise.all([
+		new Response(proc.stdout).text(),
+		new Response(proc.stderr).text(),
+		proc.exited,
+	]);
+	expect(exitCode, stderr).toBe(0);
+	return JSON.parse(stdout) as boolean;
+}
+
 describe("parseEnvFile", () => {
 	it("ignores malformed names and nul-containing values", () => {
 		const filePath = writeTempEnv(
@@ -121,3 +139,14 @@ describe("filterProcessEnv", () => {
 		});
 	});
 });
+
+describe("isBunTestRuntime", () => {
+	it("does not treat shared application env names as a test runner signal", async () => {
+		expect(await runRuntimeProbe({ NODE_ENV: "test", BUN_ENV: undefined, PI_TEST_RUNTIME: undefined })).toBe(false);
+		expect(await runRuntimeProbe({ NODE_ENV: undefined, BUN_ENV: "test", PI_TEST_RUNTIME: undefined })).toBe(false);
+	});
+
+	it("honors the private test runner signal", async () => {
+		expect(await runRuntimeProbe({ NODE_ENV: undefined, BUN_ENV: undefined, PI_TEST_RUNTIME: "1" })).toBe(true);
+	});
+});

packages/utils/test/fixtures/test-runtime-probe.ts

@@ -0,0 +1,3 @@
+import { isBunTestRuntime } from "@oh-my-pi/pi-utils/env";
+
+process.stdout.write(JSON.stringify(isBunTestRuntime()));