Fix HandlebarsContext ParseAndEvaluate method (#1213)

* Fix HandlebarsContext ParseAndEvaluate method

* test

* xxx

Author: StefH

WireMock.Net Solution.sln

@@ -6,6 +6,9 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{8F890C6F-9ACC-438D-928A-AD61CDA862F2}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{0BB8B634-407A-4610-A91F-11586990767A}"
+	ProjectSection(SolutionItems) = preProject
+		test\Directory.Build.props = test\Directory.Build.props
+	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WireMock.Net", "src\WireMock.Net\WireMock.Net.csproj", "{D3804228-91F4-4502-9595-39584E5A01AD}"
 EndProject

src/WireMock.Net/Transformers/Handlebars/HandlebarsContext.cs

@@ -27,7 +27,9 @@ public string ParseAndRender(string text, object model)
 
     public object? ParseAndEvaluate(string text, object model)
     {
-        if (Handlebars.TryEvaluate(text, model, out var result) && result is not UndefinedBindingResult)
+        if (text.StartsWith("{{") && text.EndsWith("}}") &&
+            Handlebars.TryEvaluate(text, model, out var result) &&
+            result is not UndefinedBindingResult)
         {
             return result;
         }

test/Directory.Build.props

@@ -0,0 +1,8 @@
+<Project>
+    <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
+
+    <ItemGroup Condition=" '$(TargetFramework)' != 'net45' and '$(TargetFramework)' != 'net452' and '$(TargetFramework)' != 'net461' ">
+        <AssemblyAttribute Include="System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute" />
+    </ItemGroup>
+
+</Project>

test/WireMock.Net.Tests/ResponseBuilders/ResponseWithTransformerTests.cs

@@ -130,6 +130,29 @@ public async Task Response_ProvideResponse_Handlebars_PathSegments()
         Check.That(response.Message.BodyData!.BodyAsString).Equals("a wiremock");
     }
 
+    [Theory]
+    [InlineData("{{request.PathSegments.[0]}}", "a")]
+    [InlineData("prefix_{{request.PathSegments.[0]}}", "prefix_a")]
+    [InlineData("{{request.PathSegments.[0]}}_postfix", "a_postfix")]
+    [InlineData("prefix_{{request.PathSegments.[0]}}_postfix", "prefix_a_postfix")]
+    public async Task Response_ProvideResponse_Handlebars_BodyAsJson_PathSegments(string field, string expected)
+    {
+        // Assign
+        var urlDetails = UrlUtils.Parse(new Uri("http://localhost/wiremock/a/b"), new PathString("/wiremock"));
+        var request = new RequestMessage(urlDetails, "POST", ClientIp);
+
+        var responseBuilder = Response.Create()
+            .WithBodyAsJson(new { field })
+            .WithTransformer();
+
+        // Act
+        var response = await responseBuilder.ProvideResponseAsync(_mappingMock.Object, request, _settings).ConfigureAwait(false);
+
+        // Assert
+        var json = (JObject)response.Message.BodyData!.BodyAsJson!;
+        Check.That(json["field"]!.Value<string>()).Equals(expected);
+    }
+
     [Theory(Skip = "Invalid token `OpenBracket`")]
     [InlineData(TransformerType.Scriban)]
     [InlineData(TransformerType.ScribanDotLiquid)]