** Changed in: nunit-3.0
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/908829
Title:
TestCase attribute does not play well with variadic test functions
Status in NUnit Test Framework:
Fix Released
Status in NUnit V2 Test Framework:
Fix Released
Bug description:
I often have a need to test something which produces an array of an
arbitrary number of elements and it's handy to embed the "reference
array" (an array of expected values) directly into a TestCase
attribute, like this:
[TestCase("a-b-c", '-', "a", "b", "c")]
public void TestStringSplit(String s, Char sep, params String[] expected)
{
Assert.IsEqual(s.Split(sep), expected);
}
The problem is that if such a reference array consists of exactly one
element, NUnit machinery fails to reconcile its type with the matching variadic
argument of the test function even though in C# it's perfectly OK to call a
function declared as
void Foo(params String[] args);
with just one actual argument, like
Foo("xyzzy");
To demonstrate, the test code
using System;
using NUnit.Framework;
[TestFixture]
public class DoTests
{
[TestCase("foo", "bar", "baz")]
[TestCase("foo", "bar", "baz", "xyzzy")]
[TestCase("foo", "bar")]
public void Test(String a, params String[] args)
{
Assert.IsTrue(true);
}
}
runs the first two tests OK and then fails on the third with
ProcessModel: Default DomainUsage: Single
Execution Runtime: Default
...F
Tests run: 3, Errors: 1, Failures: 0, Inconclusive: 0, Time: 0,0468765 seconds
Not run: 0, Invalid: 0, Ignored: 0, Skipped: 0
Errors and Failures:
1) Test Error : DoTests.Test("foo","bar")
System.ArgumentException : Невозможно преобразовать объект типа
"System.String" к типу "System.String[]".
в System.RuntimeType.TryChangeType(Object value, Binder binder,
CultureInfo culture, Boolean needsSpecialCast)
в System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo
culture, BindingFlags invokeAttr)
в System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder
binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
в System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean
skipVisibilityChecks)
в System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
в NUnit.Core.Reflect.InvokeMethod(MethodInfo method, Object fixture,
Object[] args)
в NUnit.Core.TestMethod.RunTestMethod(TestResult testResult)
в NUnit.Core.TestMethod.RunTestCase(TestResult testResult)
Unfortunately, I have Russian locale here but the error message roughly
translates as:
System.ArgumentException : Cannot convert object of the type "System.String"
to the type "System.String[]".
I'm not sure, but may be it's possible to know from the reflection
info that the matching argument is declared to be variadic and convert
the actual argument to an array of the matching type?
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