Fixes default initializer of Ability model.

Adds tests for Ability model.

iOS/MonsterCardsTests/Models/AbilityTests.m

@@ -0,0 +1,54 @@
+//
+//  AbilityTests.m
+//  MonsterCardsTests
+//
+//  Created by Tom Hicks on 9/5/20.
+//  Copyright © 2020 Tom Hicks. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+#import "Ability.h"
+
+@interface AbilityTests : XCTestCase
+
+@end
+
+@implementation AbilityTests {
+    Ability *_ability;
+    NSString *_name;
+    NSString *_description;
+}
+
+- (void)setUp {
+    _ability = [[Ability alloc] init];
+    _name = @"My Ability Name";
+    _description = @"This is my ability description.";
+}
+
+- (void)tearDown {
+    // Put teardown code here. This method is called after the invocation of each test method in the class.
+}
+
+- (void)testDefaultInitializer {
+    XCTAssertEqualObjects(@"", _ability.name);
+    XCTAssertEqualObjects(@"", _ability.abilityDescription);
+}
+
+- (void)testNameGetterAndSetter {
+    _ability.name = _name;
+    XCTAssertEqualObjects(_name, _ability.name);
+}
+
+- (void)testDescriptionGetterAndSetter {
+    _ability.abilityDescription = _description;
+    XCTAssertEqualObjects(_description, _ability.abilityDescription);
+}
+
+- (void)testInitWithNameAndDescription {
+    _ability = [[Ability alloc] initWithName:_name andDescription:_description];
+    
+    XCTAssertEqualObjects(_name, _ability.name);
+    XCTAssertEqualObjects(_description, _ability.abilityDescription);
+}
+
+@end