Add additional exit test for preconditions

Author: jmschonfeld

Tests/FoundationEssentialsTests/AttributedString/AttributedStringIndexTrackingTests.swift

@@ -173,6 +173,41 @@ private struct AttributedStringIndexTrackingTests {
         #expect(String(text[helloRange].characters) == "He")
     }
 
+    @Test
+    func trackingLostPreconditions() async {
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            var helloRange = try #require(text.range(of: "Hello"))
+            text.transform(updating: &helloRange) {
+                $0 = AttributedString("Foo")
+            }
+        }
+        
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            var helloRange = try #require(text.range(of: "Hello"))
+            text.transform(updating: &helloRange) {
+                $0 = AttributedString("Hello world")
+            }
+        }
+        
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            var ranges = [try #require(text.range(of: "Hello"))]
+            text.transform(updating: &ranges) {
+                $0 = AttributedString("Foo")
+            }
+        }
+        
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            var ranges = [try #require(text.range(of: "Hello"))]
+            text.transform(updating: &ranges) {
+                $0 = AttributedString("Hello world")
+            }
+        }
+    }
+    
     @Test
     func trackingLost() throws {
         let text = AttributedString("Hello, world")
@@ -225,4 +260,32 @@ private struct AttributedStringIndexTrackingTests {
         #expect(AttributedString(text[updatedRanges[0]]) == original[helloRange].settingAttributes(AttributeContainer.testInt(2)))
         #expect(AttributedString(text[updatedRanges[1]]) == original[worldRange].settingAttributes(AttributeContainer.testInt(2)))
     }
+    
+    @Test
+    func invalidInputRanges() async {
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            let other = text + AttributedString("Extra text")
+            let range = other.startIndex ..< other.endIndex
+            _ = text.transform(updating: range) { _ in
+                
+            }
+        }
+        
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            let other = text + AttributedString("Extra text")
+            let range = other.endIndex ..< other.endIndex
+            _ = text.transform(updating: range) { _ in
+                
+            }
+        }
+        
+        await #expect(processExitsWith: .failure) {
+            var text = AttributedString("Hello, world")
+            _ = text.transform(updating: []) { _ in
+                
+            }
+        }
+    }
 }