add readfile e2e test

Signed-off-by: yxxhero <aiopsclub@163.com>

test/e2e/template/helmfile/snapshot_test.go

@@ -16,7 +16,7 @@ func TestHelmfileTemplateWithBuildCommand(t *testing.T) {
 	_, filename, _, _ := runtime.Caller(0)
 	projectRoot := filepath.Join(filepath.Dir(filename), "..", "..", "..", "..")
 	helmfileBin := filepath.Join(projectRoot, "helmfile")
-	testdataDir := "testdata"
+	testdataDir := "testdata/snapshot"
 
 	entries, err := os.ReadDir(testdataDir)
 	require.NoError(t, err)

test/e2e/template/helmfile/testdata/tmpl/readfile.txt

@@ -0,0 +1 @@
+test

test/e2e/template/helmfile/tmpl_test.go

@@ -77,13 +77,36 @@ var envExecTestCases = []tmplTestCase{
 	{
 		name:       "envExec",
 		tmplString: `{{ envExec (dict) "bash" (list "-c" "echo -n $testkey" ) }}`,
-		output:     "",
 	},
 	{
 		name:       "envExecInvalidEnvType",
 		wantErr:    true,
 		tmplString: `{{ envExec "dict" "bash" (list "-c" "echo -n $testkey" ) }}`,
-		output:     "",
+	},
+}
+
+var execTestCases = []tmplTestCase{
+	{
+		name:       "exec",
+		tmplString: `{{ exec "bash" (list "-c" "echo -n $testkey" ) }}`,
+	},
+	{
+		name:       "execWithError",
+		wantErr:    true,
+		tmplString: `{{ exec "bash" (list "-c" "exit 1" ) }}`,
+	},
+}
+
+var readFileTestCases = []tmplTestCase{
+	{
+		name:       "readFile",
+		tmplString: `{{ readFile "./testdata/tmpl/readfile.txt" }}`,
+		output:     "test",
+	},
+	{
+		name:       "readFileWithError",
+		tmplString: `{{ readFile "./testdata/tmpl/readfile_error.txt" }}`,
+		wantErr:    true,
 	},
 }
 
@@ -102,6 +125,8 @@ func (t *tmplE2e) load() {
 	t.append(requireEnvTestCases...)
 	t.append(requiredTestCases...)
 	t.append(envExecTestCases...)
+	t.append(execTestCases...)
+	t.append(readFileTestCases...)
 }
 
 var tmplE2eTest = tmplE2e{}
@@ -109,6 +134,8 @@ var tmplE2eTest = tmplE2e{}
 // TestTmplStrings tests the template string
 func TestTmplStrings(t *testing.T) {
 	c := &tmpl.Context{}
+	c.SetBasePath(".")
+	c.SetReadFile(os.ReadFile)
 	tmpl := template.New("stringTemplateTest").Funcs(c.CreateFuncMap())
 
 	tmplE2eTest.load()