refactor: port fetch test to rust (#3887)

cli/tests/integration_tests.rs

@@ -21,11 +21,36 @@ fn deno_dir_test() {
   drop(g);
 }
 
-// TODO(#2933): Rewrite this test in rust.
 #[test]
 fn fetch_test() {
+  pub use deno::test_util::*;
+  use std::process::Command;
+  use tempfile::TempDir;
+
   let g = util::http_server();
-  util::run_python_script("tools/fetch_test.py");
+
+  let deno_dir = TempDir::new().expect("tempdir fail");
+  let t = util::root_path().join("cli/tests/006_url_imports.ts");
+
+  let output = Command::new(deno_exe_path())
+    .env("DENO_DIR", deno_dir.path())
+    .current_dir(util::root_path())
+    .arg("fetch")
+    .arg(t)
+    .output()
+    .expect("Failed to spawn script");
+
+  let code = output.status.code();
+  let out = std::str::from_utf8(&output.stdout).unwrap();
+
+  assert_eq!(Some(0), code);
+  assert_eq!(out, "");
+
+  let expected_path = deno_dir
+    .path()
+    .join("deps/http/localhost_PORT4545/cli/tests/subdir/mod2.ts");
+  assert_eq!(expected_path.exists(), true);
+
   drop(g);
 }
 

tools/fetch_test.py

-#!/usr/bin/env python
-# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import os
-import shutil
-import sys
-
-import http_server
-from test_util import DenoTestCase, run_tests
-from util import mkdtemp, tests_path, run_output
-
-
-class TestFetch(DenoTestCase):
-    def test_fetch(self):
-        deno_dir = mkdtemp()
-        try:
-            t = os.path.join(tests_path, "006_url_imports.ts")
-            result = run_output([self.deno_exe, "fetch", t],
-                                quiet=True,
-                                merge_env={"DENO_DIR": deno_dir})
-            self.assertEqual(result.out, "")
-            self.assertEqual(result.code, 0)
-            # Check that we actually did the prefetch.
-            os.path.exists(
-                os.path.join(
-                    deno_dir,
-                    "deps/http/localhost_PORT4545/cli/tests/subdir/mod2.ts"))
-        finally:
-            shutil.rmtree(deno_dir)
-
-
-if __name__ == "__main__":
-    run_tests()