Refactor test to write to separate dir

There will be two temp clean dir tests. We need them to not look at
what each other are creating and cause the test to pass/fail. So the
current test will need to write to a new dir that is different to what
the new test will write to.

Author: ankur22

tests/browser_test.go

@@ -69,15 +69,22 @@ func TestBrowserNewContext(t *testing.T) {
 func TestTmpDirCleanup(t *testing.T) {
 	t.Parallel()
 
-	const tmpDirPath = "./"
+	const tmpDirPath = "./1/"
+	err := os.Mkdir(tmpDirPath, os.ModePerm)
+	require.NoError(t, err)
+
+	defer func() {
+		err = os.Remove(tmpDirPath)
+		require.NoError(t, err)
+	}()
 
 	b := newTestBrowser(
 		t,
 		withSkipClose(),
 		withEnvLookup(env.ConstLookup("TMPDIR", tmpDirPath)),
 	)
 	p := b.NewPage(nil)
-	err := p.Close(nil)
+	err = p.Close(nil)
 	require.NoError(t, err)
 
 	matches, err := filepath.Glob(tmpDirPath + "xk6-browser-data-*")