[java-highlighting] [java-inspections] IDEA-327632

Conversion to enhanced switch produces incorrect code.

- Added checks that branches don't have a fast exit

GitOrigin-RevId: 33c6cffa421a3b0c3c5b9f9f1ea29127c7a99d29

java/java-tests/testData/inspection/switchExpressionMigration/beforeSwitchToExpressionWithBreak.java

@@ -0,0 +1,18 @@
+// "Replace with enhanced 'switch' expression" "false"
+
+class SwitchToExpressionWithBreak {
+  public int test(Object o) {
+    int i;
+    sw<caret>itch (o) {
+    case String s:
+    if (s.length() == 1) {
+      break;
+    }
+    i = 1;
+    break;
+    default:
+    i = 2;
+    }
+    return i;
+  }
+}

java/java-tests/testData/inspection/switchExpressionMigration/beforeSwitchToExpressionWithReturn.java

@@ -0,0 +1,18 @@
+// "Replace with enhanced 'switch' expression" "false"
+
+class SwitchToExpressionWithReturn {
+  public int test(Object o) {
+    int i;
+    sw<caret>itch (o) {
+    case String s:
+    if (s.length() == 1) {
+      return 1;
+    }
+    i = 1;
+    break;
+    default:
+    i = 2;
+    }
+    return i;
+  }
+}