add tests

Author: kostiakoval

Sources/Utility/Git.swift

@@ -58,7 +58,7 @@ public class Git {
 
     public class var majorVersionNumber: Int? {
         let prefix = "git version"
-        var version = Git.version
+        var version = self.version
         if version.hasPrefix(prefix) {
             let prefixRange = version.startIndex...version.startIndex.advanced(by: prefix.characters.count)
             version.removeSubrange(prefixRange)

Tests/LinuxMain.swift

@@ -40,4 +40,5 @@ XCTMain([
     testCase(WalkTests.allTests),
     testCase(ModuleMapsTestCase.allTests),
     testCase(DescribeTests.allTests),
+    testCase(GitTests.allTests),
 ])

Tests/Utility/GitTests.swift

@@ -0,0 +1,43 @@
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright 2015 - 2016 Apple Inc. and the Swift project authors
+ Licensed under Apache License v2.0 with Runtime Library Exception
+
+ See http://swift.org/LICENSE.txt for license information
+ See http://swift.org/CONTRIBUTORS.txt for Swift project authors
+ */
+
+@testable import Utility
+import XCTest
+
+class GitMoc: Git {
+    static var mocVersion: String = "git version 2.5.4 (Apple Git-61)"
+    override class var version: String! {
+        return mocVersion
+    }
+}
+
+class GitTests: XCTestCase {
+
+    func testGitVersion() {
+        XCTAssertEqual(GitMoc.majorVersionNumber, 2)
+
+        GitMoc.mocVersion = "2.5.4"
+        XCTAssertEqual(GitMoc.majorVersionNumber, 2)
+
+        GitMoc.mocVersion = "git version 1.5.4"
+        XCTAssertEqual(GitMoc.majorVersionNumber, 1)
+
+        GitMoc.mocVersion = "1.25.4"
+        XCTAssertEqual(GitMoc.majorVersionNumber, 1)
+    }
+}
+
+extension GitTests {
+    static var allTests : [(String, GitTests -> () throws -> Void)] {
+        return [
+                   ("testGitVersion", testGitVersion),
+        ]
+    }
+}