Addition changes to enable Verify.Cli app (#888)

- Add simple constructor to InnerVerifier for just comparing files
- Ensure replacements field is valid even if we haven't called UseAssembly

docs/mdsource/verify-file.source.md

@@ -9,4 +9,11 @@ snippet: VerifyFile
 
 An optional `info` parameter can be supplied to add more context to the test. The instance passed will be json serialized.
 
-snippet: VerifyFileWithInfo
+snippet: VerifyFileWithInfo
+
+
+## Verify a file without using a unit test
+
+Use the functionality of VerifyTests outside of a unit test.
+
+snippet: VerifyFileWithoutUnitTest

docs/verify-file.md

@@ -35,3 +35,35 @@ public Task VerifyFileWithInfo() =>
 ```
 <sup><a href='/src/Verify.Tests/StreamTests.cs#L184-L192' title='Snippet source file'>snippet source</a> | <a href='#snippet-verifyfilewithinfo' title='Start of snippet'>anchor</a></sup>
 <!-- endSnippet -->
+
+
+## Verify a file without using a unit test
+
+Use the functionality of VerifyTests outside of a unit test.
+
+<!-- snippet: VerifyFileWithoutUnitTest -->
+<a id='snippet-verifyfilewithoutunittest'></a>
+```cs
+public async Task VerifyExternalFile()
+{
+    var solutionDirectory = AttributeReader.GetSolutionDirectory();
+    var settings = new VerifySettings();
+    settings.DisableRequireUniquePrefix();
+
+    var sourceFile = Path.Combine(solutionDirectory, "Verify.Tests", "sample.txt");
+
+    Func<InnerVerifier, Task<VerifyResult>> verify = _ => _.VerifyFile(sourceFile, null);
+    await new SettingsTask(
+        settings,
+        async verifySettings =>
+        {
+            using var verifier = new InnerVerifier(
+                sourceFile,
+                verifySettings
+            );
+            return await verify(verifier);
+        });
+}
+```
+<sup><a href='/src/Verify.Tests/InnerVerifyTests.cs#L16-L39' title='Snippet source file'>snippet source</a> | <a href='#snippet-verifyfilewithoutunittest' title='Start of snippet'>anchor</a></sup>
+<!-- endSnippet -->

src/Verify.Tests/InnerVerifyTests.cs

@@ -0,0 +1,40 @@
+public class InnerVerifyTests
+{
+    [Fact]
+    public void InnerVerifier_FileConstructor()
+    {
+        const string sourceFile = "path/to/source/file.cs";
+        var settings = new VerifySettings();
+
+        var verifier = new InnerVerifier(sourceFile, settings);
+
+        Assert.NotNull(verifier);
+    }
+
+    [Fact]
+
+    #region VerifyFileWithoutUnitTest
+
+    public async Task VerifyExternalFile()
+    {
+        var solutionDirectory = AttributeReader.GetSolutionDirectory();
+        var settings = new VerifySettings();
+        settings.DisableRequireUniquePrefix();
+
+        var sourceFile = Path.Combine(solutionDirectory, "Verify.Tests", "sample.txt");
+
+        Func<InnerVerifier, Task<VerifyResult>> verify = _ => _.VerifyFile(sourceFile, null);
+        await new SettingsTask(
+            settings,
+            async verifySettings =>
+            {
+                using var verifier = new InnerVerifier(
+                    sourceFile,
+                    verifySettings
+                );
+                return await verify(verifier);
+            });
+    }
+
+    #endregion
+}

src/Verify.Tests/sample.verified.txt

@@ -0,0 +1 @@
+Foo

src/Verify/Serialization/Scrubbers/ApplyScrubbers.cs

@@ -1,10 +1,10 @@
-// ReSharper disable RedundantSuppressNullableWarningExpression
+// ReSharper disable RedundantSuppressNullableWarningExpression
 
 static class ApplyScrubbers
 {
     static char dirSeparator = Path.DirectorySeparatorChar;
     static char altDirSeparator = Path.AltDirectorySeparatorChar;
-    static List<KeyValuePair<string, string>> replacements = null!;
+    static List<KeyValuePair<string, string>> replacements = new();
 
     static string ReplaceAltDirChar(this string directory) =>
         directory.Replace(dirSeparator, altDirSeparator);

src/Verify/Verifier/InnerVerifier.cs

@@ -70,6 +70,43 @@ public static void ThrowIfVerifyHasBeenRun()
         }
     }
 
+    /// <summary>
+    /// Initialize a new instance of the <see cref="InnerVerifier"/> class for verifying the entire file (not just a specific type)
+    /// </summary>
+    /// <remarks>This constructor is used by 3rd party clients</remarks>
+    // ReSharper disable once UnusedMember.Global
+    public InnerVerifier(string sourceFile, VerifySettings settings)
+    {
+        Guard.AgainstEmpty(sourceFile);
+
+        this.settings = settings;
+        directory = ResolveDirectory(sourceFile, settings, new());
+
+        counter = Counter.Start(
+#if NET6_0_OR_GREATER
+            settings.namedDates,
+            settings.namedTimes,
+#endif
+            settings.namedDateTimes,
+            settings.namedGuids,
+            settings.namedDateTimeOffsets
+        );
+
+        IoHelpers.CreateDirectory(directory);
+
+        ValidatePrefix(settings, directory);
+
+        verifiedFiles = new List<string> { Path.Combine(directory, $"{Path.GetFileNameWithoutExtension(sourceFile)}.verified.{FileExtensions.GetExtension(sourceFile)}") };
+
+        getFileNames = target => new(
+            target.Extension,
+            sourceFile,
+            Path.Combine(directory, $"{Path.GetFileNameWithoutExtension(sourceFile)}.verified.{target.Extension}")
+        );
+
+        getIndexedFileNames = (_, _) => throw new NotImplementedException();
+    }
+
     void InitForDirectoryConvention(Namer namer, string typeAndMethod, string parameters)
     {
         var verifiedPrefix = PrefixForDirectoryConvention(namer, typeAndMethod, parameters);