[Math] Add test that Matrix init throws for invalid values array

Math/Math/Vector.swift

@@ -8,8 +8,6 @@
 
 import Foundation
 
-public typealias Float = Swift.Float
-
 /** A vector. */
 public protocol Vector {
     init()

Math/MathTests/MatrixFunctionalTests.swift

@@ -0,0 +1,14 @@
+//
+//  MatrixFunctionalTests.swift
+//  Math
+//
+//  Created by Eryn Wells on 11/6/15.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+import Foundation
+import XCTest
+
+class MatrixVectorTests: XCTestCase {
+    func 
+}

Math/MathTests/MatrixTests.swift

@@ -20,6 +20,19 @@ class Matrix4Tests: XCTestCase {
         XCTAssertEqual(Matrix4.count, 16)
         XCTAssertEqual(Matrix4().data.count, Matrix4.count)
     }
+
+    func testThatInitThrowsForInvalidSizeOfValuesArray() {
+        do {
+            let m = try Matrix4(values: [])
+            -m
+            XCTFail()
+        } catch MatrixError.InvalidSize(let given, let expected) {
+            XCTAssertEqual(given, 0)
+            XCTAssertEqual(expected, Matrix4.count)
+        } catch {
+            XCTFail()
+        }
+    }
 }
 
 class Matrix4SubscriptTests: XCTestCase {