feat: improve cover selection algorithm

scanner/coverresolve/cover_test.go

@@ -0,0 +1,85 @@
+package coverresolve
+
+import (
+	"testing"
+)
+
+func TestIsCover(t *testing.T) {
+	tests := []struct {
+		name     string
+		filename string
+		expected bool
+	}{
+		{"JPEG file", "Image.jpg", true},
+		{"JPEG file", "image.jpg", true},
+		{"PNG file", "picture.png", true},
+		{"BMP file", "photo.bmp", true},
+		{"GIF file", "animation.gif", true},
+		{"Non-image file", "document.pdf", false},
+		{"Empty file name", "", false},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result := IsCover(test.filename)
+			if result != test.expected {
+				t.Errorf("Expected IsCover(%q) to be %v, but got %v", test.filename, test.expected, result)
+			}
+		})
+	}
+}
+
+func TestSelectCover(t *testing.T) {
+
+	tests := []struct {
+		name     string
+		covers   []string
+		expected string
+	}{
+		{
+			name:     "Empty covers slice",
+			covers:   []string{},
+			expected: "",
+		},
+		{
+			name:     "Covers without keywords or numbers case sensitive",
+			covers:   []string{"Cover1.jpg", "cover2.png"},
+			expected: "Cover1.jpg",
+		},
+		{
+			name:     "Covers without keywords or numbers",
+			covers:   []string{"cover1.jpg", "cover2.png"},
+			expected: "cover1.jpg",
+		},
+		{
+			name:     "Covers with keywords and numbers",
+			covers:   []string{"cover12.jpg", "cover2.png", "special_cover1.jpg"},
+			expected: "special_cover1.jpg",
+		},
+		{
+			name:     "Covers with keywords but without numbers",
+			covers:   []string{"cover12.jpg", "cover_keyword.png"},
+			expected: "cover_keyword.png",
+		},
+		{
+			name:     "Covers without keywords but with numbers",
+			covers:   []string{"cover1.jpg", "cover12.png"},
+			expected: "cover1.jpg",
+		},
+		{
+			name:     "Covers with same highest score",
+			covers:   []string{"cover1.jpg", "cover2.jpg", "cover_special.jpg"},
+			expected: "cover_special.jpg",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			// Mock the DefaultScoreRules
+			result := SelectCover(test.covers)
+			if result != test.expected {
+				t.Errorf("Expected SelectCover(%v) to be %q, but got %q", test.covers, test.expected, result)
+			}
+		})
+	}
+}