Adopt swift-testing for AttributedString tests (#1334)

* Convert CoW tests to swift-testing

* Convert discontiguous tests to swift-testing

* Convert index validity tests to swift-testing

* Convert constraining behavior tests to swift-testing

* Convert base attributed string tests to swift-testing

* Fix build failure

* Fix test crash

Author: jmschonfeld

Tests/FoundationEssentialsTests/AttributedString/AttributedStringCOWTests.swift

@@ -10,14 +10,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if canImport(TestSupport)
-import TestSupport
-#endif
+import Testing
 
-#if FOUNDATION_FRAMEWORK
-@testable import Foundation
-#else
+#if canImport(FoundationEssentials)
 @testable import FoundationEssentials
+#else
+@testable import Foundation
 #endif
 
 extension AttributedStringProtocol {
@@ -27,7 +25,8 @@ extension AttributedStringProtocol {
 }
 
 /// Tests for `AttributedString` to confirm expected CoW behavior
-final class TestAttributedStringCOW: XCTestCase {
+@Suite("AttributedString Copy on Write")
+private struct AttributedStringCOWTests {
 
     // MARK: - Utility Functions
 
@@ -38,32 +37,32 @@ final class TestAttributedStringCOW: XCTestCase {
         return str
     }
 
-    func assertCOWCopy(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
+    func assertCOWCopy(sourceLocation: SourceLocation = #_sourceLocation, _ operation: (inout AttributedString) -> Void) {
         let str = createAttributedString()
         var copy = str
         operation(&copy)
-        XCTAssertNotEqual(str, copy, "Mutation operation did not copy when multiple references exist", file: file, line: line)
+        #expect(str != copy, "Mutation operation did not copy when multiple references exist", sourceLocation: sourceLocation)
     }
 
-    func assertCOWCopyManual(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
+    func assertCOWCopyManual(sourceLocation: SourceLocation = #_sourceLocation, _ operation: (inout AttributedString) -> Void) {
         var str = createAttributedString()
         let gutsPtr = Unmanaged.passUnretained(str._guts)
         operation(&str)
         let newGutsPtr = Unmanaged.passUnretained(str._guts)
-        XCTAssertNotEqual(gutsPtr.toOpaque(), newGutsPtr.toOpaque(), "Mutation operation with manual copy did not perform copy", file: file, line: line)
+        #expect(gutsPtr.toOpaque() != newGutsPtr.toOpaque(), "Mutation operation with manual copy did not perform copy", sourceLocation: sourceLocation)
     }
 
-    func assertCOWNoCopy(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
+    func assertCOWNoCopy(sourceLocation: SourceLocation = #_sourceLocation, _ operation: (inout AttributedString) -> Void) {
         var str = createAttributedString()
         let gutsPtr = Unmanaged.passUnretained(str._guts)
         operation(&str)
         let newGutsPtr = Unmanaged.passUnretained(str._guts)
-        XCTAssertEqual(gutsPtr.toOpaque(), newGutsPtr.toOpaque(), "Mutation operation copied when only one reference exists", file: file, line: line)
+        #expect(gutsPtr.toOpaque() == newGutsPtr.toOpaque(), "Mutation operation copied when only one reference exists", sourceLocation: sourceLocation)
     }
 
-    func assertCOWBehavior(file: StaticString = #filePath, line: UInt = #line, _ operation: (inout AttributedString) -> Void) {
-        assertCOWCopy(file: file, line: line, operation)
-        assertCOWNoCopy(file: file, line: line, operation)
+    func assertCOWBehavior(sourceLocation: SourceLocation = #_sourceLocation, _ operation: (inout AttributedString) -> Void) {
+        assertCOWCopy(sourceLocation: sourceLocation, operation)
+        assertCOWNoCopy(sourceLocation: sourceLocation, operation)
     }
 
     func makeSubrange(_ str: AttributedString) -> Range<AttributedString.Index> {
@@ -76,21 +75,22 @@ final class TestAttributedStringCOW: XCTestCase {
         return RangeSet([rangeA, rangeB])
     }
 
-    lazy var container: AttributeContainer = {
+    let container: AttributeContainer = {
         var container = AttributeContainer()
         container.testInt = 2
         return container
     }()
 
-    lazy var containerB: AttributeContainer = {
+    let containerB: AttributeContainer = {
         var container = AttributeContainer()
         container.testBool = true
         return container
     }()
 
     // MARK: - Tests
 
-    func testTopLevelType() {
+    @Test
+    func topLevelType() {
         assertCOWBehavior { (str) in
             str.setAttributes(container)
         }
@@ -126,7 +126,8 @@ final class TestAttributedStringCOW: XCTestCase {
         }
     }
 
-    func testSubstring() {
+    @Test
+    func substring() {
         assertCOWBehavior { (str) in
             str[makeSubrange(str)].setAttributes(container)
         }
@@ -147,7 +148,8 @@ final class TestAttributedStringCOW: XCTestCase {
         }
     }
 
-    func testDiscontiguousSubstring() {
+    @Test
+    func discontiguousSubstring() {
         assertCOWBehavior { (str) in
             str[makeSubranges(str)].setAttributes(container)
         }
@@ -172,7 +174,8 @@ final class TestAttributedStringCOW: XCTestCase {
         }
     }
 
-    func testCharacters() {
+    @Test
+    func characters() {
         let char: Character = "a"
 
         assertCOWBehavior { (str) in
@@ -195,15 +198,17 @@ final class TestAttributedStringCOW: XCTestCase {
         }
     }
 
-    func testUnicodeScalars() {
+    @Test
+    func unicodeScalars() {
         let scalar: UnicodeScalar = "a"
 
         assertCOWBehavior { (str) in
             str.unicodeScalars.replaceSubrange(makeSubrange(str), with: [scalar, scalar])
         }
     }
 
-    func testGenericProtocol() {
+    @Test
+    func genericProtocol() {
         assertCOWBehavior {
             $0.genericSetAttribute()
         }
@@ -212,7 +217,8 @@ final class TestAttributedStringCOW: XCTestCase {
         }
     }
 
-    func testIndexTracking() {
+    @Test
+    func indexTracking() {
         assertCOWBehavior {
             _ = $0.transform(updating: $0.startIndex ..< $0.endIndex) {
                 $0.testInt = 2
@@ -243,7 +249,7 @@ final class TestAttributedStringCOW: XCTestCase {
                 storage = $0
             }
         }
-        XCTAssertNotEqual(storage, "")
+        #expect(storage != "")
 
         // Ensure the same semantics hold even when the closure throws
         storage = AttributedString()
@@ -255,6 +261,6 @@ final class TestAttributedStringCOW: XCTestCase {
                 throw CocoaError(.fileReadUnknown)
             }
         }
-        XCTAssertNotEqual(storage, "")
+        #expect(storage != "")
     }
 }