Create failing test case

Signed-off-by: Arkaitz Jimenez <arkaitzj@gmail.com>

test/e2e/template/helmfile/tmpl_test.go

@@ -1,6 +1,7 @@
 package helmfile
 
 import (
+    "fmt"
 	"bytes"
 	"os"
 	"testing"
@@ -264,6 +265,34 @@ func (t *tmplE2e) load() {
 
 var tmplE2eTest = tmplE2e{}
 
+
+func TestFileRendering(t *testing.T) {
+
+	tmplE2eTest.load()
+
+	for _, tc := range tmplE2eTest.tcs {
+
+        t.Run(tc.name, func(t *testing.T) {
+			tc.setEnvs(t)
+            tempDir, _ := os.MkdirTemp("./testdata", "test")
+            defer os.RemoveAll(tempDir)
+
+            filename := fmt.Sprintf("%s/%s.gotmpl", tempDir, tc.name)
+            os.WriteFile(filename, []byte(tc.tmplString), 0644)
+            fileRenderer := tmpl.NewFileRenderer(os.ReadFile, ".", tc.data)
+            tmpl_bytes, err := fileRenderer.RenderToBytes(filename);
+
+			if tc.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+            tmpl := string(tmpl_bytes);
+			require.Equal(t, tc.output, tmpl)
+		})
+    }
+}
+
 // TestTmplStrings tests the template string
 func TestTmplStrings(t *testing.T) {
 	c := &tmpl.Context{}