Fix crash, verify JAM writer against lorenz-jam

build.gradle

@@ -36,6 +36,7 @@ allprojects {
 		testImplementation "net.neoforged:srgutils:${srgutils_version}"
 		testImplementation "org.cadixdev:lorenz:${lorenz_version}"
 		testImplementation "org.cadixdev:lorenz-io-enigma:${lorenz_version}"
+		testImplementation "org.cadixdev:lorenz-io-jam:${lorenz_version}"
 		testImplementation "org.junit.jupiter:junit-jupiter:${junit_jupiter_version}"
 		testRuntimeOnly "org.junit.platform:junit-platform-launcher"
 		testCompileOnly "org.jetbrains:annotations:${project.jetbrains_annotations_version}"

src/test/java/net/fabricmc/mappingio/TestHelper.java

@@ -87,11 +87,15 @@ public static org.cadixdev.lorenz.io.MappingFormat toLorenzFormat(MappingFormat
 			return MappingFormats.TSRG;
 		case ENIGMA_FILE:
 			return MappingFormats.byId("enigma");
+		case JAM_FILE:
+			return MappingFormats.byId("jam");
 		case TINY_FILE:
 		case TINY_2_FILE:
 		case ENIGMA_DIR:
 		case TSRG_2_FILE:
 		case PROGUARD_FILE:
+		case RECAF_SIMPLE_FILE:
+		case JOBF_FILE:
 			return null;
 		default:
 			throw new IllegalArgumentException("Unknown format: " + format);
@@ -119,6 +123,9 @@ public static IMappingFile.Format toSrgUtilsFormat(MappingFormat format) {
 			return IMappingFile.Format.PG;
 		case ENIGMA_FILE:
 		case ENIGMA_DIR:
+		case JAM_FILE:
+		case RECAF_SIMPLE_FILE:
+		case JOBF_FILE:
 			return null;
 		default:
 			throw new IllegalArgumentException("Unknown format: " + format);