commit 0ae561f7446f219089c540fd0720812f1c06ea05
author Matt Rajca <matt.rajca@me.com> Mon May 22 10:45:28 2017 -0700
committer Matt Rajca <matt.rajca@me.com> Mon May 22 10:50:19 2017 -0700
tree 56c6476682a556047017f195a83a0d577f1ab395
parent b18f3a0a6dfb661e868dad7138226e60558d57e2

Ensure FileManager.createDirectory does not crash if directory already exists on Linux.

Add a test for [SR-4298](https://bugs.swift.org/browse/SR-4298) to ensure calling FileManager.createDirectory does not crash
if the directory already exists.

TestFoundation/TestFileManager.swift

diff --git a/TestFoundation/TestFileManager.swift b/TestFoundation/TestFileManager.swift
index c4c665f..ab43967 100644
--- a/TestFoundation/TestFileManager.swift
+++ b/TestFoundation/TestFileManager.swift
@@ -49,7 +49,10 @@
         } catch _ {
             XCTFail()
         }
-        
+
+        // Ensure attempting to create the directory again fails gracefully.
+        XCTAssertNil(try? fm.createDirectory(atPath: path, withIntermediateDirectories:false, attributes:nil))
+
         var isDir = false
         let exists = fm.fileExists(atPath: path, isDirectory: &isDir)
         XCTAssertTrue(exists)