[Math] Some basic Vector tests

Math/MathTests/VectorTests.swift

@@ -0,0 +1,24 @@
+//
+//  VectorTests.swift
+//  Math
+//
+//  Created by Eryn Wells on 11/12/15.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+import XCTest
+@testable import Math
+
+class VectorTests: XCTestCase {
+    func testThatLengthOfAUnitVectorIsSane() {
+        XCTAssertEqualWithAccuracy(Vector3(x: 1, y: 0, z: 0).length, 1.0, accuracy: Float.Epsilon)
+    }
+
+    func testThatTheLength2OfAVectorIsSane() {
+        XCTAssertEqualWithAccuracy(Vector3(x: 2, y: 0, z: 0).length2, 4.0, accuracy: Float.Epsilon)
+    }
+
+    func testThatANormalizedVectorHasLength1() {
+        XCTAssertEqualWithAccuracy(Vector3(x: 1, y: 2, z: 3).normalized.length, 1.0, accuracy: 1e-6)
+    }
+}