Swift testing conversion

CLAUDE.md

@@ -0,0 +1,18 @@
+# PPPC Utility
+
+## Swift Concurrency
+
+- `SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor` is set on both app and test targets — don't add explicit `@MainActor` to production code or test structs/functions, it's already the default
+
+## Swift Testing Migration
+
+- Place `@Test` and `@Suite` annotations on the line **above** the declaration, not inline
+- Use `// when` and `// then` comment blocks; skip `// given` (assumed from context)
+- When XCTest assertions have message strings, preserve them as `#expect` messages, not code comments (e.g. `#expect(x == false, "reason")`)
+- Avoid `#require` on `Bool?` — it's ambiguous; use `#expect(x == true)` instead
+- Capture a baseline of compiler warnings before each phase, then verify no new warnings after. Use this command and compare the output before/after:
+  ```
+  xcodebuild clean build-for-testing -project "PPPC Utility.xcodeproj" -scheme "PPPC Utility" -destination "platform=macOS" 2>&1 | grep -i "warning:" | grep -v "xcodebuild: WARNING"
+  ```
+- Use parameterized tests with Traits where it reduces duplication; 1–2 args is ideal, max 3
+- Beyond 3 params: create separate tests with some values hard-coded

PPPC Utility.xcodeproj/project.pbxproj

@@ -547,9 +547,10 @@
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
-				CODE_SIGN_STYLE = Automatic;
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = XPLDEEDNHE;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "PPPC UtilityTests/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -571,9 +572,10 @@
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
-				CODE_SIGN_STYLE = Automatic;
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = XPLDEEDNHE;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "PPPC UtilityTests/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -711,9 +713,10 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = "Resources/PPPC Utility.entitlements";
 				CODE_SIGN_IDENTITY = "Apple Development";
-				CODE_SIGN_STYLE = Automatic;
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = XPLDEEDNHE;
+				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = NO;
 				INFOPLIST_FILE = Resources/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
@@ -734,9 +737,10 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = "Resources/PPPC Utility.entitlements";
 				CODE_SIGN_IDENTITY = "Apple Development";
-				CODE_SIGN_STYLE = Automatic;
+				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
+				CODE_SIGN_STYLE = Manual;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = XPLDEEDNHE;
+				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
 				INFOPLIST_FILE = Resources/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (