Add a performance test for the whitespace linter.

Author: allevato

Package.swift

@@ -95,31 +95,39 @@ let package = Package(
       ]
     ),
     .testTarget(
-      name: "SwiftFormatPrettyPrintTests",
+      name: "SwiftFormatCoreTests",
       dependencies: [
         "SwiftFormatConfiguration",
         "SwiftFormatCore",
-        "SwiftFormatPrettyPrint",
-        "SwiftFormatRules",
+        "SwiftSyntax",
+      ]
+    ),
+    .testTarget(
+      name: "SwiftFormatPerformanceTests",
+      dependencies: [
         "SwiftFormatTestSupport",
+        "SwiftFormatWhitespaceLinter",
         "SwiftSyntax",
       ]
     ),
     .testTarget(
-      name: "SwiftFormatWhitespaceLinterTests",
+      name: "SwiftFormatPrettyPrintTests",
       dependencies: [
         "SwiftFormatConfiguration",
         "SwiftFormatCore",
+        "SwiftFormatPrettyPrint",
+        "SwiftFormatRules",
         "SwiftFormatTestSupport",
-        "SwiftFormatWhitespaceLinter",
         "SwiftSyntax",
       ]
     ),
     .testTarget(
-      name: "SwiftFormatCoreTests",
+      name: "SwiftFormatWhitespaceLinterTests",
       dependencies: [
         "SwiftFormatConfiguration",
         "SwiftFormatCore",
+        "SwiftFormatTestSupport",
+        "SwiftFormatWhitespaceLinter",
         "SwiftSyntax",
       ]
     ),

Tests/LinuxMain.swift

@@ -2,6 +2,7 @@ import XCTest
 
 import SwiftFormatConfigurationTests
 import SwiftFormatCoreTests
+import SwiftFormatPerformanceTests
 import SwiftFormatPrettyPrintTests
 import SwiftFormatRulesTests
 import SwiftFormatTests
@@ -10,6 +11,7 @@ import SwiftFormatWhitespaceLinterTests
 var tests = [XCTestCaseEntry]()
 tests += SwiftFormatConfigurationTests.__allTests()
 tests += SwiftFormatCoreTests.__allTests()
+tests += SwiftFormatPerformanceTests.__allTests()
 tests += SwiftFormatPrettyPrintTests.__allTests()
 tests += SwiftFormatRulesTests.__allTests()
 tests += SwiftFormatTests.__allTests()

Tests/SwiftFormatPerformanceTests/WhitespaceLinterPerformanceTests.swift

@@ -0,0 +1,70 @@
+import SwiftFormatTestSupport
+import SwiftFormatWhitespaceLinter
+import SwiftSyntax
+import XCTest
+
+final class WhitespaceLinterPerformanceTests: DiagnosingTestCase {
+  func testWhitespaceLinterPerformance() {
+    let input = String(
+      repeating: """
+        import      SomeModule
+        public   class   SomeClass : SomeProtocol
+        {
+        var someProperty : SomeType {
+            get{5}set{doSomething()}
+            }
+            public
+            func
+            someFunctionName
+            (
+            firstArg    : FirstArgument , secondArg :
+            SecondArgument){
+          doSomeThings()
+                           }}
+
+        """,
+      count: 20
+    )
+    let expected = String(
+      repeating: """
+        import SomeModule
+        public class SomeClass: SomeProtocol {
+          var someProperty: SomeType {
+            get { 5 }
+            set { doSomething() }
+          }
+          public func someFunctionName(
+            firstArg: FirstArgument,
+            secondArg: SecondArgument
+          ) {
+            doSomeThings()
+          }
+        }
+
+        """,
+      count: 20
+    )
+
+    measure { performWhitespaceLint(input: input, expected: expected) }
+  }
+
+  /// Perform whitespace linting by comparing the input text from the user with the expected
+  /// formatted text, using the default configuration.
+  ///
+  /// - Parameters:
+  ///   - input: The user's input text.
+  ///   - expected: The formatted text.
+  private func performWhitespaceLint(input: String, expected: String) {
+    let sourceFileSyntax: SourceFileSyntax
+    do {
+      sourceFileSyntax = try SyntaxParser.parse(source: input)
+    } catch {
+      XCTFail("Parsing failed with error: \(error)")
+      return
+    }
+
+    let context = makeContext(sourceFileSyntax: sourceFileSyntax)
+    let linter = WhitespaceLinter(user: input, formatted: expected, context: context)
+    linter.lint()
+  }
+}

Tests/SwiftFormatPerformanceTests/XCTestManifests.swift

@@ -0,0 +1,18 @@
+#if !canImport(ObjectiveC)
+import XCTest
+
+extension WhitespaceLinterPerformanceTests {
+    // DO NOT MODIFY: This is autogenerated, use:
+    //   `swift test --generate-linuxmain`
+    // to regenerate.
+    static let __allTests__WhitespaceLinterPerformanceTests = [
+        ("testWhitespaceLinterPerformance", testWhitespaceLinterPerformance),
+    ]
+}
+
+public func __allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(WhitespaceLinterPerformanceTests.__allTests__WhitespaceLinterPerformanceTests),
+    ]
+}
+#endif