Merge pull request #286 from wleader/master

Updates the Mock File System to throw DirectoryNotFound if creating a…

Author: tathamoddie

TestHelpers.Tests/MockFileCreateTests.cs

@@ -18,6 +18,7 @@ public void Mockfile_Create_ShouldCreateNewStream()
         {
             string fullPath = XFS.Path(@"c:\something\demo.txt");
             var fileSystem = new MockFileSystem();
+            fileSystem.AddDirectory(@"c:\something");
 
             var sut = new MockFile(fileSystem);
 
@@ -33,6 +34,7 @@ public void Mockfile_Create_CanWriteToNewStream()
         {
             string fullPath = XFS.Path(@"c:\something\demo.txt");
             var fileSystem = new MockFileSystem();
+            fileSystem.AddDirectory(@"c:\something");
             var data = new UTF8Encoding(false).GetBytes("Test string");
 
             var sut = new MockFile(fileSystem);
@@ -52,6 +54,7 @@ public void Mockfile_Create_OverwritesExistingFile()
         {
             string path = XFS.Path(@"c:\some\file.txt");
             var fileSystem = new MockFileSystem();
+            fileSystem.AddDirectory(@"c:\some");
 
             var mockFile = new MockFile(fileSystem);
 
@@ -146,5 +149,20 @@ public void MockFile_Create_ShouldThrowArgumentNullExceptionIfPathIsNull()
             var exception = Assert.Throws<ArgumentNullException>(action);
             Assert.That(exception.Message, Does.StartWith("Path cannot be null."));
         }
+
+        [Test]
+        public void MockFile_Create_ShouldThrowDirectoryNotFoundExceptionIfCreatingAndParentPathDoesNotExist()
+        {
+            // Arrange
+            var fileSystem = new MockFileSystem();
+
+            // Act
+            TestDelegate action = () => fileSystem.File.Create("C:\\Path\\NotFound.ext");
+
+            // Assert
+            Assert.IsFalse(fileSystem.Directory.Exists("C:\\path"));
+            var exception = Assert.Throws<DirectoryNotFoundException>(action);
+            Assert.That(exception.Message, Does.StartWith("Could not find a part of the path"));
+        }
     }
 }

TestHelpers.Tests/MockFileOpenTests.cs

@@ -42,6 +42,7 @@ public void MockFile_Open_CreatesNewFileFileOnCreate()
         {
             string filepath = XFS.Path(@"c:\something\doesnt\exist.txt");
             var filesystem = new MockFileSystem(new Dictionary<string, MockFileData>());
+            filesystem.AddDirectory(@"c:\something\doesnt");
 
             var stream = filesystem.File.Open(filepath, FileMode.Create);
 
@@ -55,6 +56,7 @@ public void MockFile_Open_CreatesNewFileFileOnCreateNew()
         {
             string filepath = XFS.Path(@"c:\something\doesnt\exist.txt");
             var filesystem = new MockFileSystem(new Dictionary<string, MockFileData>());
+            filesystem.AddDirectory(@"c:\something\doesnt");
 
             var stream = filesystem.File.Open(filepath, FileMode.CreateNew);
 
@@ -153,6 +155,7 @@ public void MockFile_Open_CreatesNewFileOnOpenOrCreate()
         {
             string filepath = XFS.Path(@"c:\something\doesnt\exist.txt");
             var filesystem = new MockFileSystem(new Dictionary<string, MockFileData>());
+            filesystem.AddDirectory(@"c:\something\doesnt");
 
             var stream = filesystem.File.Open(filepath, FileMode.OpenOrCreate);
 
@@ -240,5 +243,20 @@ public void MockFile_OpenText_ShouldRetainCreationTime()
             // Assert
             Assert.AreEqual(creationTime, fs.FileInfo.FromFileName(filepath).CreationTime);
         }
+
+        [Test]
+        public void MockFile_Open_ShouldThrowDirectoryNotFoundExceptionIfFileModeCreateAndParentPathDoesNotExist()
+        {
+            // Arrange
+            var fileSystem = new MockFileSystem();
+
+            // Act
+            TestDelegate action = () => fileSystem.File.Open("C:\\Path\\NotFound.ext", FileMode.Create);
+
+            // Assert
+            Assert.IsFalse(fileSystem.Directory.Exists("C:\\path"));
+            var exception = Assert.Throws<DirectoryNotFoundException>(action);
+            Assert.That(exception.Message, Does.StartWith("Could not find a part of the path"));
+        }
     }
 }

TestHelpers.Tests/MockFileTests.cs

@@ -540,6 +540,7 @@ public void MockFile_AppendText_CreatesNewFileForAppendToNonExistingFile()
         {
             string filepath = XFS.Path(@"c:\something\doesnt\exist.txt");
             var filesystem = new MockFileSystem(new Dictionary<string, MockFileData>());
+            filesystem.AddDirectory(@"c:\something\doesnt");
 
             var stream = filesystem.File.AppendText(filepath);
 

TestingHelpers/MockFile.cs

@@ -141,6 +141,9 @@ public override Stream Create(string path)
             }
             mockFileDataAccessor.PathVerifier.IsLegalAbsoluteOrRelative(path, "path");
 
+            if (!mockFileDataAccessor.Directory.Exists(Path.GetDirectoryName(path)))
+                throw new DirectoryNotFoundException($"Could not find a part of the path '{path}'.");
+
             mockFileDataAccessor.AddFile(path, new MockFileData(new byte[0]));
             var stream = OpenWrite(path);
             return stream;