MockFile.Copy now throws a FileNotFoundException when the source file doesn't exist.

TestHelpers.Tests/MockFileCopyTests.cs

@@ -271,5 +271,29 @@ public void MockFile_Copy_ShouldThrowArgumentExceptionWhenTargetIsEmpty_Message(
 
             Assert.That(exception.Message, Is.StringStarting("Empty file name is not legal."));
         }
+
+        [Test]
+        public void MockFile_Copy_ShouldThrowFileNotFoundExceptionWhenSourceFileDoesNotExist_Message()
+        {
+            var sourceFileName = XFS.Path(@"c:\source\demo.txt");
+            var destFileName = XFS.Path(@"c:\destination\demo.txt");
+            var fileSystem = new MockFileSystem();
+            // The "real" System.IO.File throws a FileNotFoundException before checking if that the destination folder exists, therefore there is no need to create it.
+
+            var exception = Assert.Throws<FileNotFoundException>(() => fileSystem.File.Copy(sourceFileName, destFileName));
+            Assert.That(exception.Message, Is.EqualTo(XFS.Path(@"Could not find file 'c:\source\demo.txt'.")));
+        }
+
+        [Test]
+        public void MockFile_Copy_ShouldThrowFileNotFoundExceptionWhenSourceFileDoesNotExist_FileName()
+        {
+            var sourceFileName = XFS.Path(@"c:\source\demo.txt");
+            var destFileName = XFS.Path(@"c:\destination\demo.txt");
+            var fileSystem = new MockFileSystem();
+            // The "real" System.IO.File throws a FileNotFoundException before checking if that the destination folder exists, therefore there is no need to create it.
+
+            var exception = Assert.Throws<FileNotFoundException>(() => fileSystem.File.Copy(sourceFileName, destFileName));
+            Assert.That(exception.FileName, Is.EqualTo(sourceFileName));
+        }
     }
 }

TestHelpers.Tests/MockFileInfoTests.cs

@@ -476,5 +476,39 @@ public void MockFileInfo_MoveTo_ShouldUpdateFileInfoDirectoryAndFullName()
             Assert.AreEqual(fileInfo.DirectoryName, destinationFolder);
             Assert.AreEqual(fileInfo.FullName, destination);
         }
+
+        [Test]
+        public void MockFileInfo_CopyTo_ShouldThrowFileNotFoundExceptionWhenSourceFileDoesNotExist_Message()
+        {
+            //Arrange
+            var sourceFileName = XFS.Path(@"c:\source\demo.txt");
+            var destFileName = XFS.Path(@"c:\destination\demo.txt");
+
+            var fileSystem = new MockFileSystem();
+            var fileInfo = fileSystem.FileInfo.FromFileName(sourceFileName);
+            // The "real" FileInfo throws a FileNotFoundException before checking if that the destination folder exists, therefore there is no need to create it.
+
+            //Act
+            var exception = Assert.Throws<FileNotFoundException>(() => fileInfo.CopyTo(destFileName));
+
+            Assert.That(exception.Message, Is.EqualTo(XFS.Path(@"Could not find file 'c:\source\demo.txt'.")));
+        }
+
+        [Test]
+        public void MockFileInfo_CopyTo_ShouldThrowFileNotFoundExceptionWhenSourceFileDoesNotExist_FileName()
+        {
+            //Arrange
+            var sourceFileName = XFS.Path(@"c:\source\demo.txt");
+            var destFileName = XFS.Path(@"c:\destination\demo.txt");
+
+            var fileSystem = new MockFileSystem();
+            var fileInfo = fileSystem.FileInfo.FromFileName(sourceFileName);
+            // The "real" FileInfo throws a FileNotFoundException before checking if that the destination folder exists, therefore there is no need to create it.
+
+            //Act
+            var exception = Assert.Throws<FileNotFoundException>(() => fileInfo.CopyTo(destFileName));
+
+            Assert.That(exception.FileName, Is.EqualTo(sourceFileName));
+        }
     }
 }

TestingHelpers/MockFile.cs

@@ -112,14 +112,20 @@ public override void Copy(string sourceFileName, string destFileName, bool overw
             mockFileDataAccessor.PathVerifier.IsLegalAbsoluteOrRelative(sourceFileName, "sourceFileName");
             mockFileDataAccessor.PathVerifier.IsLegalAbsoluteOrRelative(destFileName, "destFileName");
 
+            var sourceFileExists = mockFileDataAccessor.FileExists(sourceFileName);
+            if (!sourceFileExists)
+            {
+                throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, Properties.Resources.COULD_NOT_FIND_FILE_EXCEPTION, sourceFileName), sourceFileName);
+            }
+
             var directoryNameOfDestination = mockPath.GetDirectoryName(destFileName);
             if (!mockFileDataAccessor.Directory.Exists(directoryNameOfDestination))
             {
                 throw new DirectoryNotFoundException(string.Format(CultureInfo.InvariantCulture, Properties.Resources.COULD_NOT_FIND_PART_OF_PATH_EXCEPTION, destFileName));
             }
 
-            var fileExists = mockFileDataAccessor.FileExists(destFileName);
-            if (fileExists)
+            var destFileExists = mockFileDataAccessor.FileExists(destFileName);
+            if (destFileExists)
             {
                 if (!overwrite)
                 {

TestingHelpers/Properties/Resources.resx

@@ -141,4 +141,7 @@
   <data name="FILENAME_CANNOT_BE_NULL" xml:space="preserve">
     <value>File name cannot be null.</value>
   </data>
+  <data name="COULD_NOT_FIND_FILE_EXCEPTION" xml:space="preserve">
+    <value>Could not find file '{0}'.</value>
+  </data>
 </root>