Fixes default initializer of SavingThrow model.

Adds tests for SavingThrow model.

MonsterCardsTests/Models/SavingThrowTests.m

@@ -0,0 +1,55 @@
+//
+//  SavingThrowTests.m
+//  MonsterCardsTests
+//
+//  Created by Tom Hicks on 9/5/20.
+//  Copyright © 2020 Tom Hicks. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+#import "SavingThrow.h"
+
+@interface SavingThrowTests : XCTestCase
+
+@end
+
+@implementation SavingThrowTests {
+    SavingThrow *_savingThrow;
+    NSString *_name;
+    int _order;
+}
+
+- (void)setUp {
+    _savingThrow = [[SavingThrow alloc] init];
+    _name = @"str";
+    _order = 9;
+}
+
+- (void)tearDown {
+    // Put teardown code here. This method is called after the invocation of each test method in the class.
+}
+
+- (void)testDefaultInitializer {
+    XCTAssertNotNil(_savingThrow);
+    XCTAssertEqualObjects(@"", _savingThrow.name);
+    XCTAssertEqual(-1, _savingThrow.order);
+}
+
+- (void)testInitWithNameAndOrder {
+    _savingThrow = [[SavingThrow alloc] initWithName:_name andOrder:_order];
+    XCTAssertNotNil(_savingThrow);
+    XCTAssertEqualObjects(_name, _savingThrow.name);
+    XCTAssertEqual(_order, _savingThrow.order);
+}
+
+- (void)testNameGetterAndSetter {
+    _savingThrow.name = _name;
+    XCTAssertEqualObjects(_name, _savingThrow.name);
+}
+
+- (void)testOrderGetterAndSetter {
+    _savingThrow.order = _order;
+    XCTAssertEqual(_order, _savingThrow.order);
+}
+
+@end