Added simple performance test

Signed-off-by: michael starke <michael.starke@hicknhack-software.com>

MacPassTests/KPKTestPerformance.m

@@ -0,0 +1,57 @@
+//
+//  KPKTestPerformance.m
+//  MacPass
+//
+//  Created by Michael Starke on 21/10/15.
+//  Copyright © 2015 HicknHack Software GmbH. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+#import "KPKEntry.h"
+#import "KPKAttribute.h"
+#import "KPKFormat.h"
+
+NSUInteger const _kKPKEntryCount = 1000;
+
+@interface KPKTestPerformance : XCTestCase {
+  KPKEntry *testEntry;
+}
+@end
+
+@implementation KPKTestPerformance
+
+- (void)setUp {
+  [super setUp];
+  testEntry = [[KPKEntry alloc] init];
+  NSUInteger count = _kKPKEntryCount;
+  while(count-- > 0) {
+    [testEntry addCustomAttribute:[[KPKAttribute alloc] initWithKey:@(count).stringValue
+                                                              value:@(count).stringValue]];
+  }
+}
+
+- (void)tearDown {
+  // Put teardown code here. This method is called after the invocation of each test method in the class.
+  [super tearDown];
+}
+
+- (void)testAttributeLookupPerformanceA {
+  [self measureBlock:^{
+    [testEntry customAttributeForKey:@(0).stringValue];
+  }];
+}
+
+- (void)testAttributeLookupPerformanceB {
+  [self measureBlock:^{
+    [testEntry customAttributeForKey:@(_kKPKEntryCount - 1).stringValue];
+  }];
+}
+
+- (void)testAttributeLookupPerformanceC {
+  [self measureBlock:^{
+    [testEntry customAttributeForKey:kKPKTitleKey];
+  }];
+}
+
+
+@end