core: add endless loop test

jadx-core/src/test/java/jadx/tests/integration/loops/TestEndlessLoop.java

+package jadx.tests.integration.loops;
+
+import org.junit.Test;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.IntegrationTest;
+
+import static jadx.tests.api.utils.JadxMatchers.containsOne;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.Assert.assertThat;
+
+public class TestEndlessLoop extends IntegrationTest {
+
+	public static class TestCls {
+
+		void test1() {
+			while (this == this) {
+			}
+		}
+
+		void test2() {
+			do {
+			} while (this == this);
+		}
+
+		void test3() {
+			while (true) {
+				if (this != this) {
+					return;
+				}
+			}
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString("while (this == this)"));
+	}
+}