Resolved issues with undo/redo not working properly on create/remove entry

MacPassTests/MPTestNodeDelegate.m

@@ -0,0 +1,79 @@
+//
+//  MPTestNodeDelegate.m
+//  MacPass
+//
+//  Created by Michael Starke on 13/06/16.
+//  Copyright © 2016 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+#import <KeePassKit/KeePassKit.h>
+
+@interface MPDummyDelegate : NSObject <KPKModificationDelegate>
+
+@property (strong) NSMutableSet<NSUUID *> *uuids;
+
+@end
+
+@implementation MPDummyDelegate
+
+- (instancetype)init {
+  self = [super init];
+  if(self) {
+    self.uuids = [[NSMutableSet alloc] init];
+  }
+  return self;
+}
+
+- (void)willModifyNode:(KPKNode *)node {
+  if(node.asGroup || ! node.asEntry) {
+    NSLog(@"Node is no entry, no need to do anything!");
+    return;
+  }
+  KPKEntry *entry = node.asEntry;
+  if(![self.uuids containsObject:entry.uuid]) {
+    [self.uuids addObject:entry.uuid];
+     NSLog(@"First mutation for %@ detected. Pushin history", entry);
+    [entry pushHistory];
+  }
+}
+
+@end
+
+@interface MPTestNodeDelegate : XCTestCase
+
+@property (strong) KPKEntry *entry;
+@property (strong) MPDummyDelegate *delegate;
+
+@end
+
+@implementation MPTestNodeDelegate
+
+- (void)setUp {
+  [super setUp];
+  self.entry = [[KPKEntry alloc] init];
+  self.entry.title = @"Entry Title";
+  self.entry.url = @"http://www.internet.com";
+  self.entry.password = @"1234";
+  self.entry.username = @"Entry Username";
+  self.entry.autotype.defaultKeystrokeSequence = @"{TAB 3}";
+  
+  self.delegate = [[MPDummyDelegate alloc] init];
+  
+  self.entry.delegate = self.delegate;
+}
+
+- (void)tearDown {
+  [super tearDown];
+}
+
+- (void)testModificationDetection {
+  XCTAssertTrue(self.entry.history.count == 0, @"No History entry is present on newly created entry!");
+  self.entry.password = @"New Password";
+  XCTAssertEqualObjects(self.entry.password, @"New Password", @"Password is set on entry!");
+  XCTAssertTrue(self.entry.history.count == 1, @"Changin the password creates a history entry!");
+  KPKEntry *historyEntry = self.entry.history.firstObject;
+  XCTAssertEqualObjects(historyEntry.password, @"1234", @"Password on history entry did not change!");
+}
+
+@end