refactor: Convert Classic Assert to Constraint Model (#1065)

Convert NUnit asserts to the constraint model, to simplify the [migration to NUnit v4](https://docs.nunit.org/articles/nunit/release-notes/Nunit4.0-MigrationGuide.html).

Author: vbreuss

README.md

@@ -75,7 +75,7 @@ public void MyComponent_Validate_ShouldThrowNotSupportedExceptionIfTestingIsNotA
     catch (NotSupportedException ex)
     {
         // Assert
-        Assert.AreEqual("We can't go on together. It's not me, it's you.", ex.Message);
+        Assert.That(ex.Message, Is.EqualTo("We can't go on together. It's not me, it's you."));
         return;
     }
 

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryArgumentPathTests.cs

@@ -39,7 +39,7 @@ public void Operations_ShouldThrowArgumentNullExceptionIfPathIsNull(Action<IDire
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(wrapped);
-            Assert.AreEqual("path", exception.ParamName);
+            Assert.That(exception.ParamName, Is.EqualTo("path"));
         }
     }
 }

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryInfoFactoryTests.cs

@@ -12,7 +12,7 @@ public void MockDirectoryInfoFactory_Wrap_WithNull_ShouldReturnNull()
 
             var result = fileSystem.DirectoryInfo.Wrap(null);
 
-            Assert.IsNull(result);
+            Assert.That(result, Is.Null);
         }
     }
 }

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryInfoSymlinkTests.cs

@@ -23,7 +23,7 @@ public void MockDirectoryInfo_ResolveLinkTarget_ShouldReturnPathOfTargetLink()
 
             var result = fileSystem.DirectoryInfo.New("foo").ResolveLinkTarget(false);
 
-            Assert.AreEqual("bar", result.Name);
+            Assert.That(result.Name, Is.EqualTo("bar"));
         }
 
         [Test]
@@ -36,7 +36,7 @@ public void MockDirectoryInfo_ResolveLinkTarget_WithFinalTarget_ShouldReturnPath
 
             var result = fileSystem.DirectoryInfo.New("foo1").ResolveLinkTarget(true);
 
-            Assert.AreEqual("bar", result.Name);
+            Assert.That(result.Name, Is.EqualTo("bar"));
         }
 
         [Test]
@@ -49,7 +49,7 @@ public void MockDirectoryInfo_ResolveLinkTarget_WithoutFinalTarget_ShouldReturnF
 
             var result = fileSystem.DirectoryInfo.New("foo1").ResolveLinkTarget(false);
 
-            Assert.AreEqual("foo", result.Name);
+            Assert.That(result.Name, Is.EqualTo("foo"));
         }
 
         [Test]

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryInfoTests.cs

@@ -19,7 +19,7 @@ public static IEnumerable<object[]> MockDirectoryInfo_GetExtension_Cases
             }
         }
 
-        [TestCaseSource("MockDirectoryInfo_GetExtension_Cases")]
+        [TestCaseSource(nameof(MockDirectoryInfo_GetExtension_Cases))]
         public void MockDirectoryInfo_GetExtension_ShouldReturnEmptyString(string directoryPath)
         {
             // Arrange
@@ -30,7 +30,7 @@ public void MockDirectoryInfo_GetExtension_ShouldReturnEmptyString(string direct
             var result = directoryInfo.Extension;
 
             // Assert
-            Assert.AreEqual(string.Empty, result);
+            Assert.That(result, Is.Empty);
         }
 
         public static IEnumerable<object[]> MockDirectoryInfo_Exists_Cases
@@ -42,7 +42,7 @@ public static IEnumerable<object[]> MockDirectoryInfo_Exists_Cases
             }
         }
 
-        [TestCaseSource("MockDirectoryInfo_Exists_Cases")]
+        [TestCaseSource(nameof(MockDirectoryInfo_Exists_Cases))]
         public void MockDirectoryInfo_Exists(string path, bool expected)
         {
             var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
@@ -106,7 +106,7 @@ public void MockDirectoryInfo_GetFiles_ShouldWorkWithUNCPath()
             var files = directoryInfo.GetFiles();
 
             // Assert
-            Assert.AreEqual(fileName, files[0].FullName);
+            Assert.That(files[0].FullName, Is.EqualTo(fileName));
         }
 
         [Test]
@@ -129,7 +129,7 @@ public void MockDirectoryInfo_GetFiles_ShouldWorkWithUNCPath_WhenCurrentDirector
             var files = directoryInfo.GetFiles();
 
             // Assert
-            Assert.AreEqual(fileName, files[0].FullName);
+            Assert.That(files[0].FullName, Is.EqualTo(fileName));
         }
 
         [Test]
@@ -263,7 +263,7 @@ public void MockDirectoryInfo_GetParent_ShouldReturnDirectoriesAndNamesWithSearc
             var result = directoryInfo.Parent;
 
             // Assert
-            Assert.AreEqual(XFS.Path(@"c:\a\b"), result.FullName);
+            Assert.That(result.FullName, Is.EqualTo(XFS.Path(@"c:\a\b")));
         }
 
         [Test]
@@ -287,7 +287,7 @@ public void MockDirectoryInfo_EnumerateFiles_ShouldReturnAllFiles()
             var directoryInfo = new MockDirectoryInfo(fileSystem, XFS.Path(@"c:\temp\folder"));
 
             // Assert
-            Assert.AreEqual(new[] { "b.txt", "c.txt" }, directoryInfo.EnumerateFiles().ToList().Select(x => x.Name).ToArray());
+            Assert.That(directoryInfo.EnumerateFiles().ToList().Select(x => x.Name).ToArray(), Is.EqualTo(new[] { "b.txt", "c.txt" }));
         }
 
         [Test]
@@ -309,7 +309,7 @@ public void MockDirectoryInfo_EnumerateDirectories_ShouldReturnAllDirectories()
             var directories = directoryInfo.EnumerateDirectories().Select(a => a.Name).ToArray();
 
             // Assert
-            Assert.AreEqual(new[] { "b", "c" }, directories);
+            Assert.That(directories, Is.EqualTo(new[] { "b", "c" }));
         }
 
         [TestCase(@"\\unc\folder", @"\\unc\folder")]
@@ -327,7 +327,7 @@ public void MockDirectoryInfo_FullName_ShouldReturnNormalizedUNCPath(string dire
             var actualFullName = directoryInfo.FullName;
 
             // Assert
-            Assert.AreEqual(expectedFullName, actualFullName);
+            Assert.That(actualFullName, Is.EqualTo(expectedFullName));
         }
 
         [TestCase(@"c:\temp\\folder", @"c:\temp\folder")]
@@ -345,7 +345,7 @@ public void MockDirectoryInfo_FullName_ShouldReturnNormalizedPath(string directo
             var actualFullName = directoryInfo.FullName;
 
             // Assert
-            Assert.AreEqual(expectedFullName, actualFullName);
+            Assert.That(actualFullName, Is.EqualTo(expectedFullName));
         }
 
         [TestCase(@"c:\temp\folder  ", @"c:\temp\folder")]
@@ -360,7 +360,7 @@ public void MockDirectoryInfo_FullName_ShouldReturnPathWithTrimmedTrailingSpaces
             var actualFullName = directoryInfo.FullName;
 
             // Assert
-            Assert.AreEqual(expectedFullName, actualFullName);
+            Assert.That(actualFullName, Is.EqualTo(expectedFullName));
         }
 
         [Test]
@@ -377,7 +377,7 @@ public void MockDirectoryInfo_MoveTo_ShouldUpdateFullName()
             directoryInfo.MoveTo(destination);
 
             // Assert
-            Assert.AreEqual(destination, directoryInfo.FullName);
+            Assert.That(directoryInfo.FullName, Is.EqualTo(destination));
         }
 
         [TestCase(@"c:\temp\\folder ", @"folder")]
@@ -392,7 +392,7 @@ public void MockDirectoryInfo_Name_ShouldReturnNameWithTrimmedTrailingSpaces(str
             var actualName = directoryInfo.Name;
 
             // Assert
-            Assert.AreEqual(expectedName, actualName);
+            Assert.That(actualName, Is.EqualTo(expectedName));
         }
 
         [TestCase(@"c:\", @"c:\")]
@@ -407,7 +407,7 @@ public void MockDirectoryInfo_Name_ShouldReturnPathRoot_IfDirectoryPathIsPathRoo
             var actualName = directoryInfo.Name;
 
             // Assert
-            Assert.AreEqual(expectedName, actualName);
+            Assert.That(actualName, Is.EqualTo(expectedName));
         }
 
         [Test]
@@ -462,7 +462,7 @@ public void MockDirectoryInfo_ToString_ShouldReturnDirectoryName(string director
             var mockDirectoryInfo = new MockDirectoryInfo(new MockFileSystem(), directoryPath);
 
             // Assert
-            Assert.AreEqual(directoryPath, mockDirectoryInfo.ToString());
+            Assert.That(mockDirectoryInfo.ToString(), Is.EqualTo(directoryPath));
         }
 
         [Test]
@@ -477,7 +477,7 @@ public void MockDirectoryInfo_Exists_ShouldReturnCachedData()
             fileSystem.AddDirectory(path);
 
             // Assert
-            Assert.IsFalse(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.False);
         }
 
         [Test]
@@ -493,7 +493,7 @@ public void MockDirectoryInfo_Exists_ShouldUpdateCachedDataOnRefresh()
             directoryInfo.Refresh();
 
             // Assert
-            Assert.IsTrue(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.True);
         }
 
         [Test]
@@ -507,7 +507,7 @@ public void Directory_exists_after_creation()
             directoryInfo.Create();
 
             // Assert
-            Assert.IsTrue(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.True);
         }
 
         [Test, WindowsOnly(WindowsSpecifics.AccessControlLists)]
@@ -521,7 +521,7 @@ public void Directory_exists_after_creation_with_security()
             directoryInfo.Create(new DirectorySecurity());
 
             // Assert
-            Assert.IsTrue(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.True);
         }
 
         [Test]
@@ -535,7 +535,7 @@ public void Directory_does_not_exist_after_delete()
             directoryInfo.Delete();
 
             // Assert
-            Assert.IsFalse(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.False);
         }
 
         [Test]
@@ -549,7 +549,7 @@ public void Directory_does_not_exist_after_recursive_delete()
             directoryInfo.Delete(true);
 
             // Assert
-            Assert.IsFalse(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.False);
         }
 
         [Test]
@@ -563,7 +563,7 @@ public void Directory_still_exists_after_move()
             directoryInfo.MoveTo(XFS.Path(@"c:\abc2"));
 
             // Assert
-            Assert.IsTrue(directoryInfo.Exists);
+            Assert.That(directoryInfo.Exists, Is.True);
         }
 
         [Test]
@@ -582,7 +582,7 @@ public void MockDirectoryInfo_LastAccessTime_ShouldReflectChangedValue()
             directoryInfo.LastAccessTime = lastAccessTime;
 
             // Assert
-            Assert.AreEqual(lastAccessTime, directoryInfo.LastAccessTime);
+            Assert.That(directoryInfo.LastAccessTime, Is.EqualTo(lastAccessTime));
         }
 
         [Test]

tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectorySymlinkTests.cs

@@ -23,8 +23,8 @@ public void MockDirectory_CreateSymbolicLink_ShouldReturnFileSystemInfo()
             IFileSystemInfo fileSystemInfo = fileSystem.Directory.CreateSymbolicLink(path, pathToTarget);
 
             // Assert
-            Assert.AreEqual(path, fileSystemInfo.FullName);
-            Assert.AreEqual(pathToTarget, fileSystemInfo.LinkTarget);
+            Assert.That(fileSystemInfo.FullName, Is.EqualTo(path));
+            Assert.That(fileSystemInfo.LinkTarget, Is.EqualTo(pathToTarget));
         }
 
         [Test]
@@ -41,8 +41,8 @@ public void MockDirectory_CreateSymbolicLink_ShouldSucceedFromDirectoryInfo()
             IDirectoryInfo directoryInfo = fileSystem.DirectoryInfo.New(path);
 
             // Assert
-            Assert.AreEqual(path, directoryInfo.FullName);
-            Assert.AreEqual(pathToTarget, directoryInfo.LinkTarget);
+            Assert.That(directoryInfo.FullName, Is.EqualTo(path));
+            Assert.That(directoryInfo.LinkTarget, Is.EqualTo(pathToTarget));
         }
 
         [Test]
@@ -195,7 +195,7 @@ public void MockDirectory_CreateSymbolicLink_ShouldNotFailIfTargetDoesNotExist()
             var fileSystemInfo = fileSystem.Directory.CreateSymbolicLink(path, pathToTarget);
 
             // Assert
-            Assert.IsTrue(fileSystemInfo.Exists);
+            Assert.That(fileSystemInfo.Exists, Is.True);
         }
 
         [Test]
@@ -209,7 +209,7 @@ public void MockDirectory_CreateSymbolicLink_ShouldSetReparsePointAttribute()
             fileSystem.Directory.CreateSymbolicLink(path, pathToTarget);
 
             var attributes = fileSystem.DirectoryInfo.New(path).Attributes;
-            Assert.IsTrue(attributes.HasFlag(FileAttributes.ReparsePoint));
+            Assert.That(attributes.HasFlag(FileAttributes.ReparsePoint), Is.True);
         }
 
         [Test]
@@ -221,7 +221,7 @@ public void MockDirectory_ResolveLinkTarget_ShouldReturnPathOfTargetLink()
 
             var result = fileSystem.Directory.ResolveLinkTarget("foo", false);
 
-            Assert.AreEqual("bar", result.Name);
+            Assert.That(result.Name, Is.EqualTo("bar"));
         }
 
         [Test]
@@ -242,7 +242,7 @@ public void MockDirectory_ResolveLinkTarget_WithFinalTarget_ShouldReturnPathOfTa
 
             var result = fileSystem.Directory.ResolveLinkTarget(previousPath, true);
 
-            Assert.AreEqual("bar", result.Name);
+            Assert.That(result.Name, Is.EqualTo("bar"));
         }
 
         [Test]
@@ -275,7 +275,7 @@ public void MockDirectory_ResolveLinkTarget_WithoutFinalTarget_ShouldReturnFirst
 
             var result = fileSystem.Directory.ResolveLinkTarget("foo1", false);
 
-            Assert.AreEqual("foo", result.Name);
+            Assert.That(result.Name, Is.EqualTo("foo"));
         }
 
         [Test]