Update inlay hint tests and add case with explicit type annotations

Author: fwcd

Tests/SourceKitLSPTests/InlayHintsTests.swift

@@ -67,6 +67,9 @@ final class InlayHintsTests: XCTestCase {
     let x = 4
     var y = "test" + "123"
     """
+    // FIXME: These type hints should ideally be displayed after the variable name
+    // rather than after the expression. Once the implementation is updated (e.g.
+    // by using a new SourceKit request), these tests should be updated too.
     let hints = performInlayHintsRequest(text: text)
     XCTAssertEqual(hints, [
       InlayHint(
@@ -156,4 +159,30 @@ final class InlayHintsTests: XCTestCase {
       ),
     ])
   }
+
+  func testExplicitTypeAnnotation() {
+    let text = """
+    let x: String = "abc"
+    
+    struct X {
+      var y: Int = 34
+    }
+    """
+    let hints = performInlayHintsRequest(text: text)
+    // FIXME: Explicitly type-annotated variable bindings shouldn't have
+    // an inlay hint. Once we move to the new SourceKit request (as detailed
+    // in the other comment above), we should receive the empty array here.
+    XCTAssertEqual(hints, [
+      InlayHint(
+        position: Position(line: 0, utf16index: 21),
+        category: .type,
+        label: "String"
+      ),
+      InlayHint(
+        position: Position(line: 3, utf16index: 17),
+        category: .type,
+        label: "Int"
+      )
+    ])
+  }
 }

Tests/SourceKitLSPTests/XCTestManifests.swift

@@ -96,6 +96,7 @@ extension InlayHintsTests {
     static let __allTests__InlayHintsTests = [
         ("testBindings", testBindings),
         ("testEmpty", testEmpty),
+        ("testExplicitTypeAnnotation", testExplicitTypeAnnotation),
         ("testFields", testFields),
         ("testRanged", testRanged),
     ]