fix(setup): align Python setup probe with eval

packages/coding-agent/test/setup-cli.test.ts

@@ -0,0 +1,81 @@
+import { afterEach, describe, expect, it } from "bun:test";
+import * as fs from "node:fs/promises";
+import * as path from "node:path";
+import { TempDir } from "@oh-my-pi/pi-utils";
+
+const cliEntry = path.join(import.meta.dir, "..", "src", "cli.ts");
+
+interface CliProcessResult {
+	exitCode: number;
+	output: string;
+	error: string;
+}
+
+async function runSetupPython(cwd: string): Promise<CliProcessResult> {
+	const env: NodeJS.ProcessEnv = {
+		...process.env,
+		NO_COLOR: "1",
+		PI_CODING_AGENT_DIR: path.join(cwd, "agent"),
+	};
+	delete env.VIRTUAL_ENV;
+	delete env.CONDA_DEFAULT_ENV;
+	delete env.CONDA_PREFIX;
+	const proc = Bun.spawn([process.execPath, cliEntry, "setup", "python", "--json"], {
+		cwd,
+		stdout: "pipe",
+		stderr: "pipe",
+		env,
+	});
+	const output = new Response(proc.stdout).text();
+	const error = new Response(proc.stderr).text();
+	const [exitCode, stdout, stderr] = await Promise.all([proc.exited, output, error]);
+	return { exitCode, output: stdout, error: stderr };
+}
+
+describe("omp setup python", () => {
+	let projectDir: TempDir | undefined;
+
+	afterEach(async () => {
+		await projectDir?.remove();
+		projectDir = undefined;
+	});
+
+	it.skipIf(process.platform === "win32")(
+		"probes the project-configured interpreter instead of the PATH interpreter",
+		async () => {
+			projectDir = TempDir.createSync("@omp-setup-python-");
+			const cwd = projectDir.path();
+			const interpreter = path.join(cwd, "configured-python");
+			await Bun.write(interpreter, "#!/bin/sh\nexit 0\n");
+			await fs.chmod(interpreter, 0o755);
+			await Bun.write(path.join(cwd, ".omp", "config.yml"), `python:\n  interpreter: ${interpreter}\n`);
+
+			const result = await runSetupPython(cwd);
+
+			expect(result.error).toBe("");
+			expect(result.exitCode).toBe(0);
+			expect(JSON.parse(result.output)).toMatchObject({
+				available: true,
+				pythonPath: interpreter,
+				usingManagedEnv: false,
+			});
+		},
+	);
+	it.skipIf(process.platform === "win32")("prefers the project venv over the PATH interpreter", async () => {
+		projectDir = TempDir.createSync("@omp-setup-python-");
+		const cwd = projectDir.path();
+		const interpreter = path.join(cwd, ".venv", "bin", "python");
+		await Bun.write(interpreter, "#!/bin/sh\nexit 0\n");
+		await fs.chmod(interpreter, 0o755);
+
+		const result = await runSetupPython(cwd);
+
+		expect(result.error).toBe("");
+		expect(result.exitCode).toBe(0);
+		expect(JSON.parse(result.output)).toMatchObject({
+			available: true,
+			pythonPath: interpreter,
+			usingManagedEnv: false,
+		});
+	});
+});