test: add text attribute testing function

This will be used for testing attributed strings

damus.xcodeproj/project.pbxproj

@@ -188,6 +188,7 @@
 		4C9147002A2A891E00DDEA40 /* error.c in Sources */ = {isa = PBXBuildFile; fileRef = 4C9146FF2A2A891E00DDEA40 /* error.c */; };
 		4C987B57283FD07F0042CE38 /* FollowersModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C987B56283FD07F0042CE38 /* FollowersModel.swift */; };
 		4C9AA14A2A4587A6003F49FD /* NotificationStatusModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C9AA1492A4587A6003F49FD /* NotificationStatusModel.swift */; };
+		4C9B0DEE2A65A75F00CBDA21 /* AttrStringTestExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C9B0DED2A65A75F00CBDA21 /* AttrStringTestExtensions.swift */; };
 		4C9BB83129C0ED4F00FC4E37 /* DisplayName.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C9BB83029C0ED4F00FC4E37 /* DisplayName.swift */; };
 		4C9BB83429C12D9900FC4E37 /* EventProfileName.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C9BB83329C12D9900FC4E37 /* EventProfileName.swift */; };
 		4C9F18E229AA9B6C008C55EC /* CustomizeZapView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C9F18E129AA9B6C008C55EC /* CustomizeZapView.swift */; };
@@ -664,6 +665,7 @@
 		4C9146FF2A2A891E00DDEA40 /* error.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = error.c; sourceTree = "<group>"; };
 		4C987B56283FD07F0042CE38 /* FollowersModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FollowersModel.swift; sourceTree = "<group>"; };
 		4C9AA1492A4587A6003F49FD /* NotificationStatusModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationStatusModel.swift; sourceTree = "<group>"; };
+		4C9B0DED2A65A75F00CBDA21 /* AttrStringTestExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AttrStringTestExtensions.swift; sourceTree = "<group>"; };
 		4C9BB83029C0ED4F00FC4E37 /* DisplayName.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DisplayName.swift; sourceTree = "<group>"; };
 		4C9BB83329C12D9900FC4E37 /* EventProfileName.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EventProfileName.swift; sourceTree = "<group>"; };
 		4C9F18E129AA9B6C008C55EC /* CustomizeZapView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomizeZapView.swift; sourceTree = "<group>"; };
@@ -1291,6 +1293,14 @@
 			path = Buttons;
 			sourceTree = "<group>";
 		};
+		4C9B0DEC2A65A74000CBDA21 /* Util */ = {
+			isa = PBXGroup;
+			children = (
+				4C9B0DED2A65A75F00CBDA21 /* AttrStringTestExtensions.swift */,
+			);
+			path = Util;
+			sourceTree = "<group>";
+		};
 		4CA9275B2A28FF570098A105 /* Longform */ = {
 			isa = PBXGroup;
 			children = (
@@ -1495,6 +1505,7 @@
 		4CE6DEF627F7A08200C66700 /* damusTests */ = {
 			isa = PBXGroup;
 			children = (
+				4C9B0DEC2A65A74000CBDA21 /* Util */,
 				4C0C03962A61E2670098B3B8 /* Fixtures */,
 				4C7D097D2A0C58B900943473 /* WalletConnectTests.swift */,
 				F944F56C29EA9CB20067B3BF /* Models */,
@@ -2127,6 +2138,7 @@
 			files = (
 				5019CADD2A0FB0A9000069E1 /* ProfileDatabaseTests.swift in Sources */,
 				3A90B1832A4EA3C600000D94 /* UserSearchCacheTests.swift in Sources */,
+				4C9B0DEE2A65A75F00CBDA21 /* AttrStringTestExtensions.swift in Sources */,
 				4C19AE552A5D977400C90DB7 /* HashtagTests.swift in Sources */,
 				3A3040ED29A5CB86008A0F29 /* ReplyDescriptionTests.swift in Sources */,
 				3AAC7A022A60FE72002B50DF /* LocalizationUtilTests.swift in Sources */,

damusTests/Util/AttrStringTestExtensions.swift

@@ -0,0 +1,27 @@
+//
+//  AttrStringTestExtensions.swift
+//  damusTests
+//
+//  Created by William Casarin on 2023-07-17.
+//
+
+import Foundation
+import XCTest
+
+extension NSAttributedString {
+    func testAttributes(conditions: [([Key: Any]) -> Void]) throws {
+        var count = 0
+
+        self.enumerateAttributes(in: .init(0..<self.length)) { attrs, range, stop in
+            if count > conditions.count {
+                XCTAssert(false, "too many attributes \(count) attrs > \(conditions.count) conditions")
+            }
+
+            conditions[count](attrs)
+
+            count += 1
+        }
+
+        XCTAssertEqual(count, conditions.count)
+    }
+}