[switch completion] IDEA-277375 Can't complete default label in switch case

Add the `default` keyword to the completions after `case`.

GitOrigin-RevId: 8e1e05d230a43a11a47d9b55ab89548530ab68b2

java/java-impl/src/com/intellij/codeInsight/completion/JavaKeywordCompletion.java

@@ -304,6 +304,7 @@ public class JavaKeywordCompletion {
     if (selectorType instanceof PsiPrimitiveType) return;
 
     addKeyword(createKeyword(PsiKeyword.NULL));
+    addKeyword(createKeyword(PsiKeyword.DEFAULT));
   }
 
   private boolean isInsideCaseLabel() {

java/java-tests/testData/codeInsight/completion/normal/CompleteDefaultInSwitchExpr.java

@@ -0,0 +1,21 @@
+
+class Main {
+
+  int f(Object o) {
+    return switch(o) {
+      case Integer i, def<caret>
+    }
+  }
+
+  int g(Object o) {
+    return switch(o) {
+      case def<caret>, Integer i
+    }
+  }
+
+  int h(Object o) {
+    return switch(o) {
+      case def<caret>
+    }
+  }
+}

java/java-tests/testData/codeInsight/completion/normal/CompleteDefaultInSwitchExpr_after.java

@@ -0,0 +1,21 @@
+
+class Main {
+
+  int f(Object o) {
+    return switch(o) {
+      case Integer i, default
+    }
+  }
+
+  int g(Object o) {
+    return switch(o) {
+      case default, Integer i
+    }
+  }
+
+  int h(Object o) {
+    return switch(o) {
+      case default
+    }
+  }
+}

java/java-tests/testData/codeInsight/completion/normal/CompleteDefaultInSwitchStmt.java

@@ -0,0 +1,21 @@
+
+class Main {
+
+  void f(Object o) {
+    switch(o) {
+      case Integer i, def<caret>
+    }
+  }
+
+  void g(Object o) {
+    switch(o) {
+      case def<caret>, Integer i
+    }
+  }
+
+  void h(Object o) {
+    switch(o) {
+      case def<caret>
+    }
+  }
+}

java/java-tests/testData/codeInsight/completion/normal/CompleteDefaultInSwitchStmt_after.java

@@ -0,0 +1,21 @@
+
+class Main {
+
+  void f(Object o) {
+    switch(o) {
+      case Integer i, default
+    }
+  }
+
+  void g(Object o) {
+    switch(o) {
+      case default, Integer i
+    }
+  }
+
+  void h(Object o) {
+    switch(o) {
+      case default
+    }
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/completion/NormalSwitchCompletionTest.groovy

@@ -35,6 +35,9 @@ class NormalSwitchCompletionTest extends NormalCompletionTestCase {
   void testCompleteNullInSwitchStmt() { doTest() }
   void testCompleteNullInSwitchExpr() { doTest() }
 
+  void testCompleteDefaultInSwitchStmt() { doTest() }
+  void testCompleteDefaultInSwitchExpr() { doTest() }
+
   void testCompletePatternVariableSwitchStmt() { doTest() }
   void testCompletePatternVariableSwitchExpr() { doTest() }