Add missing test

pointfreeco · Sep 5, 2024 · 87608bc · 87608bc
1 parent 64cf3e8
commit 87608bc
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/Tests/ComposableArchitectureTests/ObservableTests.swift b/Tests/ComposableArchitectureTests/ObservableTests.swift
@@ -43,6 +43,25 @@ final class ObservableTests: BaseTCATestCase {
  XCTAssertEqual(state.children[0].count, 43)
  }
 
+ func testCopyMutation_WithPerturbation() async {
+ var state = ParentState(children: [ChildState(count: 42)])
+ let countDidChange = self.expectation(description: "count.didChange")
+ var copy = state.children[0]
+ copy.count += 1
+
+ withPerceptionTracking {
+ _ = state.children[0].count
+ } onChange: {
+ countDidChange.fulfill()
+ }
+
+ state.children[0] = copy
+ state.children[0]._$willModify()
+
+ await self.fulfillment(of: [countDidChange], timeout: 0.1)
+ XCTAssertEqual(state.children[0].count, 43)
+ }
+
  func testReplace() async {
  XCTTODO("Ideally this would pass but we cannot detect this kind of mutation currently.")