- added a specific message

felix-v-net · web-flow · commit f0b073f41e42 · 2017-07-31T17:39:49.000+12:00
Added ArgumentException with a message to let user know that parameter name conflicts with header name in ExampleTable
diff --git a/src/TestStack.BDDfy/Scanners/StepScanners/Fluent/FluentScanner.cs b/src/TestStack.BDDfy/Scanners/StepScanners/Fluent/FluentScanner.cs
@@ -203,9 +203,15 @@ private StepTitle CreateTitle(string stepTextTemplate, bool includeInputsInStepT
                                 {
                                     if (_testContext.Examples != null)
                                     {
-                                        var matchingHeader = _testContext.Examples.Headers
-                                            .SingleOrDefault(header => ExampleTable.HeaderMatches(header, i.ParameterName) ||
-                                            ExampleTable.HeaderMatches(header, i.Value.Name));
+                                        var matchingHeaders = _testContext.Examples.Headers
+                                            .Where(header => ExampleTable.HeaderMatches(header, i.ParameterName) ||
+                                                            ExampleTable.HeaderMatches(header, i.Value.Name))
+                                            .ToList();
+
+                                        if (matchingHeaders.Count > 1)
+                                            throw new ArgumentException($"Cannot uniquely distinguish parameter name between '{methodInfo.Name}' method's parameter name '{i.ParameterName}' and header's name '{i.Value.Name}'");
+
+                                        var matchingHeader = matchingHeaders.SingleOrDefault();
                                         if (matchingHeader != null)
                                             return string.Format("<{0}>", matchingHeader);
                                     }

Original file line number	Diff line number	Diff line change
`@@ -203,9 +203,15 @@ private StepTitle CreateTitle(string stepTextTemplate, bool includeInputsInStepT`
`203`	`203`	`{`
`204`	`204`	`if (_testContext.Examples != null)`
`205`	`205`	`{`
`206`		`- var matchingHeader = _testContext.Examples.Headers`
`207`		`- .SingleOrDefault(header => ExampleTable.HeaderMatches(header, i.ParameterName) \|\|`
`208`		`- ExampleTable.HeaderMatches(header, i.Value.Name));`
	`206`	`+ var matchingHeaders = _testContext.Examples.Headers`
	`207`	`+ .Where(header => ExampleTable.HeaderMatches(header, i.ParameterName) \|\|`
	`208`	`+ ExampleTable.HeaderMatches(header, i.Value.Name))`
	`209`	`+ .ToList();`
	`210`	`+`
	`211`	`+ if (matchingHeaders.Count > 1)`
	`212`	`+ throw new ArgumentException($"Cannot uniquely distinguish parameter name between '{methodInfo.Name}' method's parameter name '{i.ParameterName}' and header's name '{i.Value.Name}'");`
	`213`	`+`
	`214`	`+ var matchingHeader = matchingHeaders.SingleOrDefault();`
`209`	`215`	`if (matchingHeader != null)`
`210`	`216`	`return string.Format("<{0}>", matchingHeader);`
`211`	`217`	`}`