Implement `Bun.which`

1 files changed, 52 insertions, 0 deletions

diff --git a/test/bun.js/which.test.ts b/test/bun.js/which.test.ts
new file mode 100644
index 000000000..7fd4b8400
--- /dev/null
+++ b/test/bun.js/which.test.ts
@@ -0,0 +1,52 @@
+import { test, expect } from "bun:test";
+
+import { which } from "bun";
+
+test("which", () => {
+  writeFixture("/tmp/myscript.sh");
+
+  // Our cwd is not /tmp
+  expect(which("myscript.sh")).toBe(null);
+
+  // "bun" is in our PATH
+  expect(which("bun")?.length > 0).toBe(true);
+
+  expect(
+    // You can override PATH
+    which("myscript.sh", {
+      PATH: "/tmp",
+    })
+  ).toBe("/tmp/myscript.sh");
+
+  expect(
+    which("myscript.sh", {
+      PATH: "/not-tmp",
+    })
+  ).toBe(null);
+
+  expect(
+    // PATH works like the $PATH environment variable, respecting colons
+    which("myscript.sh", {
+      PATH: "/not-tmp:/tmp",
+    })
+  ).toBe("/tmp/myscript.sh");
+
+  expect(
+    // cwd is checked first
+    which("myscript.sh", {
+      cwd: "/tmp",
+    })
+  ).toBe("/tmp/myscript.sh");
+});
+
+function writeFixture(path) {
+  var fs = require("fs");
+  try {
+    fs.unlinkSync(path);
+  } catch (e) {}
+
+  var script_name = path;
+  var script_content = "echo Hello world!";
+  fs.writeFileSync(script_name, script_content);
+  fs.chmodSync(script_name, "755");
+}