Create GCDTests.swift

Author: NevinBR

Tests/IntegerUtilitiesTests/GCDTests.swift

@@ -0,0 +1,38 @@
+//===--- GCDTests.swift ---------------------------------------*- swift -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2021 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import IntegerUtilities
+import XCTest
+
+final class IntegerUtilitiesGCDTests: XCTestCase {
+  func testGCDInt() {
+    XCTAssertEqual(Int.gcd(0, 0), 0)
+    XCTAssertEqual(Int.gcd(0, 1), 1)
+    XCTAssertEqual(Int.gcd(1, 0), 1)
+    XCTAssertEqual(Int.gcd(0, -1), 1)
+    XCTAssertEqual(Int.gcd(1, 1), 1)
+    XCTAssertEqual(Int.gcd(1, 2), 1)
+    XCTAssertEqual(Int.gcd(2, 2), 2)
+    XCTAssertEqual(Int.gcd(4, 2), 2)
+    XCTAssertEqual(Int.gcd(6, 8), 2)
+    XCTAssertEqual(Int.gcd(77, 91), 7)
+    XCTAssertEqual(Int.gcd(24, -36), 12)
+    XCTAssertEqual(Int.gcd(-24, -36), 12)
+    XCTAssertEqual(Int.gcd(51, 34), 17)
+    XCTAssertEqual(Int.gcd(64, 96), 32)
+    XCTAssertEqual(Int.gcd(-64, 96), 32)
+    XCTAssertEqual(Int.gcd(4*7*19, 27*25), 1)
+    XCTAssertEqual(Int.gcd(16*315, 11*315), 315)
+    XCTAssertEqual(Int.gcd(97*67*53*27*8, 83*67*53*9*32), 67*53*9*8)
+    XCTAssertEqual(Int.gcd(Int.min, 2), 2)
+  }
+}