tests: use tempdir to avoid manual gc

Signed-off-by: Max Tantow <max@macks.cloud>

cmd/flux/build_kustomization_test.go

@@ -22,6 +22,7 @@ package main
 import (
 	"bytes"
 	"os"
+	"path/filepath"
 	"testing"
 	"text/template"
 )
@@ -118,6 +119,8 @@ spec:
       cluster_region: "eu-central-1"
 `
 
+	tmpFile := filepath.Join(t.TempDir(), "podinfo.yaml")
+
 	tests := []struct {
 		name       string
 		args       string
@@ -132,25 +135,25 @@ spec:
 		},
 		{
 			name:       "build podinfo",
-			args:       "build kustomization podinfo --kustomization-file ./testdata/build-kustomization/podinfo.yaml --path ./testdata/build-kustomization/podinfo",
+			args:       "build kustomization podinfo --kustomization-file " + tmpFile + " --path ./testdata/build-kustomization/podinfo",
 			resultFile: "./testdata/build-kustomization/podinfo-result.yaml",
 			assertFunc: "assertGoldenTemplateFile",
 		},
 		{
 			name:       "build podinfo without service",
-			args:       "build kustomization podinfo --kustomization-file ./testdata/build-kustomization/podinfo.yaml --path ./testdata/build-kustomization/delete-service",
+			args:       "build kustomization podinfo --kustomization-file " + tmpFile + " --path ./testdata/build-kustomization/delete-service",
 			resultFile: "./testdata/build-kustomization/podinfo-without-service-result.yaml",
 			assertFunc: "assertGoldenTemplateFile",
 		},
 		{
 			name:       "build deployment and configmap with var substitution",
-			args:       "build kustomization podinfo --kustomization-file ./testdata/build-kustomization/podinfo.yaml --path ./testdata/build-kustomization/var-substitution",
+			args:       "build kustomization podinfo --kustomization-file " + tmpFile + " --path ./testdata/build-kustomization/var-substitution",
 			resultFile: "./testdata/build-kustomization/podinfo-with-var-substitution-result.yaml",
 			assertFunc: "assertGoldenTemplateFile",
 		},
 		{
 			name:       "build deployment and configmap with var substitution in dry-run mode",
-			args:       "build kustomization podinfo --kustomization-file ./testdata/build-kustomization/podinfo.yaml --path ./testdata/build-kustomization/var-substitution --dry-run",
+			args:       "build kustomization podinfo --kustomization-file " + tmpFile + " --path ./testdata/build-kustomization/var-substitution --dry-run",
 			resultFile: "./testdata/build-kustomization/podinfo-with-var-substitution-result.yaml",
 			assertFunc: "assertGoldenTemplateFile",
 		},
@@ -161,8 +164,6 @@ spec:
 	}
 	setup(t, tmpl)
 
-	testEnv.CreateObjectFile("./testdata/build-kustomization/podinfo-source.yaml", tmpl, t)
-
 	temp, err := template.New("podinfo").Parse(podinfo)
 	if err != nil {
 		t.Fatal(err)
@@ -174,11 +175,10 @@ spec:
 		t.Fatal(err)
 	}
 
-	err = os.WriteFile("./testdata/build-kustomization/podinfo.yaml", b.Bytes(), 0666)
+	err = os.WriteFile(tmpFile, b.Bytes(), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
-	t.Cleanup(func() { _ = os.Remove("./testdata/build-kustomization/podinfo.yaml") })
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {