chore: minify background image (#933)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

backend/internal/bootstrap/application_images_bootstrap_test.go

@@ -0,0 +1,61 @@
+package bootstrap
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+)
+
+func TestGetBuiltInImageData(t *testing.T) {
+	// Get the built-in image data map
+	builtInImages := getBuiltInImageHashes()
+
+	// Read the actual images directory from disk
+	imagesDir := filepath.Join("..", "..", "resources", "images")
+	actualFiles, err := os.ReadDir(imagesDir)
+	require.NoError(t, err, "Failed to read images directory")
+
+	// Create a map of actual files for comparison
+	actualFilesMap := make(map[string]struct{})
+
+	// Validate each actual file exists in the built-in data with correct hash
+	for _, file := range actualFiles {
+		fileName := file.Name()
+		if file.IsDir() || strings.HasPrefix(fileName, ".") {
+			continue
+		}
+
+		actualFilesMap[fileName] = struct{}{}
+
+		// Check if the file exists in the built-in data
+		builtInHash, exists := builtInImages[fileName]
+		assert.True(t, exists, "File %s exists in images directory but not in getBuiltInImageData map", fileName)
+
+		if !exists {
+			continue
+		}
+
+		filePath := filepath.Join(imagesDir, fileName)
+
+		// Validate SHA256 hash
+		actualHash, err := utils.CreateSha256FileHash(filePath)
+		require.NoError(t, err, "Failed to compute hash for %s", fileName)
+		assert.Equal(t, actualHash, builtInHash, "SHA256 hash mismatch for file %s", fileName)
+	}
+
+	// Ensure the built-in data doesn't have extra files that don't exist in the directory
+	for fileName := range builtInImages {
+		_, exists := actualFilesMap[fileName]
+		assert.True(t, exists, "File %s exists in getBuiltInImageData map but not in images directory", fileName)
+	}
+
+	// Ensure we have at least some files (sanity check)
+	assert.NotEmpty(t, actualFilesMap, "Images directory should contain at least one file")
+	assert.Len(t, actualFilesMap, len(builtInImages), "Number of files in directory should match number in built-in data map")
+}