diff --git a/myexec/cmd_test.go b/myexec/cmd_uixt_test.go
similarity index 100%
rename from myexec/cmd_test.go
rename to myexec/cmd_uixt_test.go
diff --git a/myexec/cmd_windows_test.go b/myexec/cmd_windows_test.go
new file mode 100644
index 0000000..31d84d8
--- /dev/null
+++ b/myexec/cmd_windows_test.go
@@ -0,0 +1,21 @@
+package myexec
+
+import "testing"
+
+func TestRunShell(t *testing.T) {
+	exitCode, err := RunShell("echo hello world")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if exitCode != 0 {
+		t.Fatalf("expected exit code 0, got %d", exitCode)
+	}
+
+	exitCode, err = RunShell("dir /b /s; exit /b 3")
+	if err == nil {
+		t.Fatal(err)
+	}
+	if exitCode != 3 {
+		t.Fatalf("expected exit code 3, got %d", exitCode)
+	}
+}