test: cover archive file selection helpers

internal/parser/archive_test.go

@@ -28,6 +28,26 @@ func TestExtractArchiveFromReaderTXT(t *testing.T) {
 	}
 }
 
+func TestArchiveFileSelectionHelpers(t *testing.T) {
+	extensions := SupportedArchiveExtensions()
+	if len(extensions) == 0 || extensions[0] != ".ahs" {
+		t.Fatalf("unexpected supported extensions: %v", extensions)
+	}
+	if !IsSupportedArchiveFilename("report.TGZ") || IsSupportedArchiveFilename("report.bin") {
+		t.Fatal("unexpected supported archive detection")
+	}
+	files := []ExtractedFile{{Path: "logs/System.LOG"}, {Path: "config.json"}, {Path: "nested/event.log"}}
+	if got := FindFileByPattern(files, "log"); len(got) != 2 {
+		t.Fatalf("FindFileByPattern = %+v", got)
+	}
+	if got := FindFileByName(files, "EVENT.LOG"); got == nil || got.Path != "nested/event.log" {
+		t.Fatalf("FindFileByName = %+v", got)
+	}
+	if got := FindFileByName(files, "missing"); got != nil {
+		t.Fatalf("expected missing file, got %+v", got)
+	}
+}
+
 func TestExtractArchiveTXT(t *testing.T) {
 	dir := t.TempDir()
 	path := filepath.Join(dir, "sample.txt")