Add unit test target for Terrain2

Terrain2Tests/Terrain2Tests.swift

@@ -0,0 +1,33 @@
+//
+//  Terrain2Tests.swift
+//  Terrain2Tests
+//
+//  Created by Eryn Wells on 11/8/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import XCTest
+
+class Terrain2Tests: XCTestCase {
+
+    override func setUp() {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+
+    func testPerformanceExample() {
+        // This is an example of a performance test case.
+        self.measure {
+            // Put the code you want to measure the time of here.
+        }
+    }
+
+}