fix: allow to regenerate class code (#791)

jadx-core/src/test/java/jadx/tests/api/utils/assertj/JadxCodeAssertions.java

@@ -51,4 +51,11 @@ public class JadxCodeAssertions extends AbstractStringAssert<JadxCodeAssertions>
 		}
 		return countString(1, sb.toString());
 	}
+
+	public JadxCodeAssertions print() {
+		System.out.println("-----------------------------------------------------------");
+		System.out.println(actual);
+		System.out.println("-----------------------------------------------------------");
+		return this;
+	}
 }

jadx-core/src/test/java/jadx/tests/integration/others/TestClassReGen.java

@@ -0,0 +1,41 @@
+package jadx.tests.integration.others;
+
+import org.junit.jupiter.api.Test;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.IntegrationTest;
+
+import static jadx.tests.api.utils.assertj.JadxAssertions.assertThat;
+
+public class TestClassReGen extends IntegrationTest {
+
+	public static class TestCls {
+		private int intField = 5;
+
+		public static class A {
+		}
+
+		public int test() {
+			return 0;
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		assertThat(cls.getCode())
+				.containsOnlyOnce("private int intField = 5;")
+				.containsOnlyOnce("public static class A {")
+				.containsOnlyOnce("public int test() {");
+
+		cls.getInnerClasses().get(0).getClassInfo().changeShortName("ARenamed");
+		cls.searchMethodByShortName("test").getMethodInfo().setAlias("testRenamed");
+		cls.searchFieldByName("intField").getFieldInfo().setAlias("intFieldRenamed");
+
+		assertThat(cls.reloadCode())
+				.print()
+				.containsOnlyOnce("private int intFieldRenamed = 5;")
+				.containsOnlyOnce("public static class ARenamed {")
+				.containsOnlyOnce("public int testRenamed() {");
+	}
+}