fix: improve 'out' block detection in switch (#826)

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

@@ -10,6 +10,10 @@ public class JadxCodeAssertions extends AbstractStringAssert<JadxCodeAssertions>
 		super(code, JadxCodeAssertions.class);
 	}
 
+	public JadxCodeAssertions containsOne(String substring) {
+		return countString(1, substring);
+	}
+
 	public JadxCodeAssertions countString(int count, String substring) {
 		isNotNull();
 		int actualCount = TestUtils.count(actual, substring);

jadx-core/src/test/java/jadx/tests/integration/switches/TestSwitch2.java

@@ -17,7 +17,7 @@ public class TestSwitch2 extends IntegrationTest {
 		boolean isScrolling;
 		float multiTouchZoomOldDist;
 
-		void test(int action) {
+		public void test(int action) {
 			switch (action & 255) {
 				case 0:
 					this.isLongtouchable = true;

jadx-core/src/test/java/jadx/tests/integration/switches/TestSwitchFallThrough.java

@@ -2,7 +2,6 @@ package jadx.tests.integration.switches;
 
 import org.junit.jupiter.api.Test;
 
-import jadx.NotYetImplemented;
 import jadx.tests.api.IntegrationTest;
 
 import static jadx.tests.api.utils.assertj.JadxAssertions.assertThat;
@@ -12,6 +11,7 @@ public class TestSwitchFallThrough extends IntegrationTest {
 	public static class TestCls {
 		public int r;
 
+		@SuppressWarnings("fallthrough")
 		public void test(int a) {
 			int i = 10;
 			switch (a) {
@@ -43,12 +43,14 @@ public class TestSwitchFallThrough extends IntegrationTest {
 		}
 	}
 
-	@NotYetImplemented("switch fallthrough")
 	@Test
 	public void test() {
 		assertThat(getClassNode(TestCls.class))
 				.code()
-				.containsOnlyOnce("switch");
+				.containsOne("switch (a) {")
+				.containsOne("r = i;")
+				.containsOne("r = -1;")
+				.countString(2, "break;");
 		// code correctness checks done in 'check' method
 	}
 }

jadx-core/src/test/java/jadx/tests/integration/switches/TestSwitchReturnFromCase.java

@@ -47,6 +47,8 @@ public class TestSwitchReturnFromCase extends IntegrationTest {
 		String code = cls.getCode().toString();
 
 		assertThat(code, containsString("switch (a % 10) {"));
+
+		// case 5: removed
 		assertEquals(5, count(code, "case "));
 		assertEquals(3, count(code, "break;"));
 

jadx-core/src/test/java/jadx/tests/integration/switches/TestSwitchWithFallThroughCase.java

@@ -26,6 +26,7 @@ public class TestSwitchWithFallThroughCase extends IntegrationTest {
 						}
 						break;
 					}
+					// fallthrough
 				case 2:
 					if (b) {
 						str += "2";