Merge pull request #66278 from natecook1000/string_cow_test_fix

Fix String capacity growth tests for watchOS

Author: swift-ci

validation-test/stdlib/String.swift

@@ -2380,7 +2380,8 @@ StringTests.test("String.CoW.reserveCapacity") {
   let preGrowCapacity = str.capacity
 
   // Growth shouldn't be linear
-  str.append(contentsOf: String(repeating: "z", count: 20))
+  let newElementCount = (preGrowCapacity - str.count) + 10
+  str.append(contentsOf: String(repeating: "z", count: newElementCount))
   expectGE(str.capacity, preGrowCapacity * 2)
 
   // Capacity can shrink when copying, but not below the count
@@ -2407,7 +2408,6 @@ StringTests.test("NSString.CoW.reserveCapacity") {
   var copy2 = str2
   copy2.append(contentsOf: String(repeating: "z", count: 10))
   expectGE(copy2.capacity, 30)
-  expectLT(copy2.capacity, 40)
 #endif
 }