Allow expansion of trailing placeholders that only have a type and no text

Author: ahoppen

Sources/SwiftRefactor/ExpandEditorPlaceholder.swift

@@ -309,8 +309,8 @@ fileprivate enum EditorPlaceholderData {
     var typeText: Substring
     (text, typeText) = split(text, separatedBy: "##")
     if typeText.isEmpty {
-      // No type information
-      self = .basic(text: text)
+      // Only type information present
+      self.init(typeText: text)
       return
     }
 

Tests/SwiftRefactorTest/ExpandEditorPlaceholdersTests.swift

@@ -52,6 +52,20 @@ final class ExpandEditorPlaceholdersTest: XCTestCase {
     try assertRefactorPlaceholderCall(baseline, expected: expected)
   }
 
+  func testPlaceholderWithoutExplicitText() throws {
+    let placeholder = ExpandEditorPlaceholder.wrapInPlaceholder("T##(Int) -> Void")
+    let baseline = "call(\(placeholder))"
+
+    let int = ExpandEditorPlaceholder.wrapInPlaceholder("Int")
+    let expected: String = """
+      call { \(int) in
+          \(voidPlaceholder)
+      }
+      """
+
+    try assertRefactorPlaceholderCall(baseline, expected: expected)
+  }
+
   func testMultipleClosureArgs() throws {
     let baseline = "call(arg1: \(closurePlaceholder), arg2: \(closurePlaceholder))"