test(mcp): refactor helm toolset tests (#333)

Refactor tests to new approach before adding more functionality.

Signed-off-by: Marc Nuri <marc@marcnuri.com>

internal/test/test.go

@@ -1,8 +1,21 @@
 package test
 
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
 func Must[T any](v T, err error) T {
 	if err != nil {
 		panic(err)
 	}
 	return v
 }
+
+func ReadFile(path ...string) string {
+	_, file, _, _ := runtime.Caller(1)
+	filePath := filepath.Join(append([]string{filepath.Dir(file)}, path...)...)
+	fileBytes := Must(os.ReadFile(filePath))
+	return string(fileBytes)
+}