Use cross-platform filepath.Join for test case

Author: rdimartino

rules/terraform_required_version_test.go

@@ -1,6 +1,7 @@
 package rules
 
 import (
+	"path/filepath"
 	"testing"
 
 	"github.com/hashicorp/hcl/v2"
@@ -108,10 +109,10 @@ func Test_TerraformRequiredVersionRuleMultipleFiles(t *testing.T) {
 
 	t.Run("multiple files no terraform blocks", func(t *testing.T) {
 		files := map[string]string{
-			"modules/foo/bar/other.tf": "",
-			"modules/foo/outputs.tf":   "",
-			"modules/foo/main.tf":      "",
-			"modules/foo/variables.tf": "",
+			filepath.Join("modules", "foo", "bar", "other.tf"): "",
+			filepath.Join("modules", "foo", "outputs.tf"):      "",
+			filepath.Join("modules", "foo", "main.tf"):         "",
+			filepath.Join("modules", "foo", "variables.tf"):    "",
 		}
 		runner := helper.TestRunner(t, files)
 		if err := rule.Check(runner); err != nil {