add readfile e2e test

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

pkg/tmpl/context.go

@@ -5,3 +5,12 @@ type Context struct {
 	basePath  string
 	readFile  func(string) ([]byte, error)
 }
+
+// SetBasePath sets the base path for the template
+func (c *Context) SetBasePath(path string) {
+	c.basePath = path
+}
+
+func (c *Context) SetReadFile(f func(string) ([]byte, error)) {
+	c.readFile = f
+}

pkg/tmpl/context_funcs.go

@@ -172,6 +172,10 @@ func (c *Context) ReadFile(filename string) (string, error) {
 		path = filepath.Join(c.basePath, filename)
 	}
 
+	if c.readFile == nil {
+		return "", fmt.Errorf("readFile is not implemented")
+	}
+
 	bytes, err := c.readFile(path)
 	if err != nil {
 		return "", err