Remove Invalid Syntax Tests

The new parser no longer instantiates UnknownSyntax nodes, so this test isn't actually ever going to catch anything.

Author: CodaFi

Tests/SwiftFormatTests/SyntaxValidatingVisitorTests.swift

@@ -21,40 +21,8 @@ final class SyntaxValidatingVisitorTests: XCTestCase {
     XCTAssertNil(_firstInvalidSyntaxPosition(in: createSyntax(from: input)))
   }
 
-  func testInvalidSyntax() {
-    var input =
-      """
-      class {TemplateName} {
-        var bar = 0
-      }
-      """
-    assertInvalidSyntax(in: input, atLine: 1, column: 7)
-
-    input =
-      """
-      switch a {
-      @unknown what_is_this default: break
-      }
-      """
-    assertInvalidSyntax(in: input, atLine: 1, column: 1)
-  }
-
   /// Parses the given source into a syntax tree.
   private func createSyntax(from source: String) -> Syntax {
-  }
-
-  /// Asserts that `SyntaxValidatingVisitor` finds invalid syntax in the given source code at the
-  /// given line and column.
-  private func assertInvalidSyntax(
-    in source: String, atLine: Int, column: Int, file: StaticString = #file, line: UInt = #line
-  ) {
-    guard let position = _firstInvalidSyntaxPosition(in: createSyntax(from: source)) else {
-      XCTFail("No invalid syntax was found", file: file, line: line)
-      return
-    }
-    let location = SourceLocationConverter(file: "", source: source).location(for: position)
-    XCTAssertEqual(location.line, atLine, file: file, line: line)
-    XCTAssertEqual(location.column, column, file: file, line: line)
     return Syntax(try! Parser.parse(source: source))
   }
 }