Get down an initial diamond-squares implementation

Terrain2Tests/AlgorithmsTests.swift

@@ -0,0 +1,52 @@
+//
+//  AlgorithmsTests.swift
+//  Terrain2Tests
+//
+//  Created by Eryn Wells on 11/8/18.
+//  Copyright © 2018 Eryn Wells. All rights reserved.
+//
+
+import XCTest
+import Terrain2
+
+class DiamondSquareBoxTests: XCTestCase {
+    func testNorthwest() {
+        let box = DiamondSquareAlgorithm.Box(origin: DiamondSquareAlgorithm.Box.Point(x: 3, y: 4),
+                                             size: DiamondSquareAlgorithm.Box.Size(w: 5, h: 5))
+        let pt = box.northwest
+        XCTAssertEqual(pt.x, 3)
+        XCTAssertEqual(pt.y, 4)
+    }
+
+    func testNortheast() {
+        let box = DiamondSquareAlgorithm.Box(origin: DiamondSquareAlgorithm.Box.Point(x: 3, y: 4),
+                                             size: DiamondSquareAlgorithm.Box.Size(w: 5, h: 5))
+        let pt = box.northeast
+        XCTAssertEqual(pt.x, 8)
+        XCTAssertEqual(pt.y, 4)
+    }
+
+    func testSouthwest() {
+        let box = DiamondSquareAlgorithm.Box(origin: DiamondSquareAlgorithm.Box.Point(x: 3, y: 4),
+                                             size: DiamondSquareAlgorithm.Box.Size(w: 5, h: 5))
+        let pt = box.southwest
+        XCTAssertEqual(pt.x, 3)
+        XCTAssertEqual(pt.y, 9)
+    }
+
+    func testSoutheast() {
+        let box = DiamondSquareAlgorithm.Box(origin: DiamondSquareAlgorithm.Box.Point(x: 3, y: 4),
+                                             size: DiamondSquareAlgorithm.Box.Size(w: 5, h: 5))
+        let pt = box.southeast
+        XCTAssertEqual(pt.x, 8)
+        XCTAssertEqual(pt.y, 9)
+    }
+
+    func testMidpoint() {
+        let box = DiamondSquareAlgorithm.Box(origin: DiamondSquareAlgorithm.Box.Point(x: 3, y: 4),
+                                             size: DiamondSquareAlgorithm.Box.Size(w: 5, h: 5))
+        let midpoint = box.midpoint
+        XCTAssertEqual(midpoint.x, 6)
+        XCTAssertEqual(midpoint.y, 7)
+    }
+}