Added one more test and fixed behavior when curly braces are aligned next to each other

Author: Kacper20

lib/IDE/Refactoring.cpp

@@ -1943,14 +1943,14 @@ bool RefactoringActionExpandSwitchCases::performChange() {
     InsertRange = CharSourceRange(SM, RBraceLoc, RBraceLoc);
   }
   EditorConsumerInsertStream OS(EditConsumer, SM, InsertRange);
+  if (SM.getLineNumber(SwitchS->getLBraceLoc()) ==
+      SM.getLineNumber(SwitchS->getRBraceLoc())) {
+    OS << "\n";
+  }
   auto Result = performCasesExpansionInSwitchStmt(SwitchS,
                                            DiagEngine,
                                            SwitchS->getStartLoc(),
                                            OS);
-  if (SM.getLineNumber(SwitchS->getLBraceLoc()) ==
-      SM.getLineNumber(SwitchS->getRBraceLoc())) {
-    EditConsumer.insertAfter(SM, SwitchS->getLBraceLoc(), "\n");
-  }
   return Result;
 }
 

test/refactoring/ExpandSwitchCases/Outputs/basic/L10.swift.expected

@@ -6,8 +6,8 @@ enum E {
 }
 
 func foo(e: E) -> Int {
-  switch e {
- case .e1: <#code#>
+  switch e { 
+case .e1: <#code#>
 case .e2: <#code#>
 case .e3: <#code#>
 case .e4: <#code#>

test/refactoring/ExpandSwitchCases/Outputs/no_space_between_braces/L10.swift.expected

@@ -0,0 +1,15 @@
+enum E {
+  case e1
+  case e2
+  case e3
+  case e4
+}
+
+func foo(e: E) -> Int {
+  switch e {
+case .e1: <#code#>
+case .e2: <#code#>
+case .e3: <#code#>
+case .e4: <#code#>
+}
+}

test/refactoring/ExpandSwitchCases/no_space_between_braces.swift

@@ -0,0 +1,13 @@
+enum E {
+  case e1
+  case e2
+  case e3
+  case e4
+}
+
+func foo(e: E) -> Int {
+  switch e {}
+}
+// RUN: rm -rf %t.result && mkdir -p %t.result
+// RUN: %refactor -expand-switch-cases -source-filename %s -pos=9:8 >> %t.result/L10.swift
+// RUN: diff -u %S/Outputs/no_space_between_braces/L10.swift.expected %t.result/L10.swift