Fix bug in fsBackend and add tests for file utils

internal/util/util_test.go

@@ -0,0 +1,71 @@
+// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package util_test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ClusterCockpit/cc-backend/internal/util"
+)
+
+func TestCheckFileExists(t *testing.T) {
+	tmpdir := t.TempDir()
+	filePath := filepath.Join(tmpdir, "version.txt")
+
+	if err := os.WriteFile(filePath, []byte(fmt.Sprintf("%d", 1)), 0666); err != nil {
+		t.Fatal(err)
+	}
+	if !util.CheckFileExists(filePath) {
+		t.Fatal("expected true, got false")
+	}
+
+	filePath = filepath.Join(tmpdir, "version-test.txt")
+	if util.CheckFileExists(filePath) {
+		t.Fatal("expected false, got true")
+	}
+}
+
+func TestGetFileSize(t *testing.T) {
+	tmpdir := t.TempDir()
+	filePath := filepath.Join(tmpdir, "data.json")
+
+	if s := util.GetFilesize(filePath); s > 0 {
+		t.Fatalf("expected 0, got %d", s)
+	}
+
+	if err := os.WriteFile(filePath, []byte(fmt.Sprintf("%d", 1)), 0666); err != nil {
+		t.Fatal(err)
+	}
+	if s := util.GetFilesize(filePath); s == 0 {
+		t.Fatal("expected not 0, got 0")
+	}
+}
+
+func TestGetFileCount(t *testing.T) {
+	tmpdir := t.TempDir()
+
+	if c := util.GetFilecount(tmpdir); c != 0 {
+		t.Fatalf("expected 0, got %d", c)
+	}
+
+	filePath := filepath.Join(tmpdir, "data-1.json")
+	if err := os.WriteFile(filePath, []byte(fmt.Sprintf("%d", 1)), 0666); err != nil {
+		t.Fatal(err)
+	}
+	filePath = filepath.Join(tmpdir, "data-2.json")
+	if err := os.WriteFile(filePath, []byte(fmt.Sprintf("%d", 1)), 0666); err != nil {
+		t.Fatal(err)
+	}
+	if c := util.GetFilecount(tmpdir); c != 2 {
+		t.Fatalf("expected 2, got %d", c)
+	}
+
+	if c := util.GetFilecount(filePath); c != 0 {
+		t.Fatalf("expected 0, got %d", c)
+	}
+}