SpecFlow. Couldn't load file or assembly

Question

I'm tring use 2 projects in SpecFlow.

The first project has name: FrontEnd.Tests There are SpecFlow's Features and Steps (Definitions)

The second project: FrontEnd.Tests.Extended So, In second project I added in App.config

  <specFlow>
    <unitTestProvider name="MsTest" />
    <stepAssemblies>
      <stepAssembly assembly="FrontEnd.Tests" />
    </stepAssemblies>
  </specFlow>

To use steps definitions from 1st project. But I get error:

System.IO.FileNotFoundException: Could not load file or assembly 'FrontEnd.Tests' or one of its dependencies.

Projects are in the same directory.

See if [this](http://stackoverflow.com/questions/255669/how-to-enable-assembly-bind-failure-logging-fusion-in-net) helps. — Jester, Jul 10 '15 at 17:27
Then you should have added the information from that log into your question. — Jester, Jul 10 '15 at 17:43
After that I got: System.IO.FileNotFoundException: Could not load file or assembly 'FrontEnd.Tests' or one of its dependencies. Another information I found extra — Denis Evseev, Jul 10 '15 at 17:55
Is your FrontEnd.Tests.Extended project referencing the FrontEnd.Tests project? — Greg Burghardt, Jan 29 '20 at 12:22
And did you verify that FrontEnd.Tests.dll is in the same build folder as FrontEnd.Tests.Extended? — Greg Burghardt, Jan 29 '20 at 12:23

score 1 · Answer 1 · answered Oct 09 '19 at 12:21

1

Try this, add a file with name specflow.json and reference your assemblies in there:

{
  "stepAssemblies": [ 
    { "stepAssembly": "FrontEnd.Tests" } 
  ]
}

answered Oct 09 '19 at 12:21

AimusSage

696
4
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This literally does the same thing as the XML in the question. – Greg Burghardt Jan 29 '20 at 12:22

score 0 · Answer 2 · answered Jul 10 '15 at 17:33

0

I think you need to put .dll on the end of the file name:

<specFlow>
  <unitTestProvider name="MsTest" />
  <stepAssemblies>
    <stepAssembly assembly="FrontEnd.Tests.dll" />
  </stepAssemblies>
</specFlow>

answered Jul 10 '15 at 17:33

Sam Holder

32,535
13
101
181

score 0 · Answer 3 · answered Oct 08 '19 at 02:14

0

For those in .net core you need to exclude the ".dll" extension and the file is specflow.json and set the properties like so:

answered Oct 08 '19 at 02:14

ronnie

494
3
4

score 0 · Answer 4 · answered Jan 27 '20 at 15:27

For those working with .netCore and VSCode and/or dotnet-cli you need to do 2 things:

First: specify the additional assembly in the specflow.json file (just the name of the file without .dll extension)

{
   "stepAssemblies": [
      { "assembly": "AssemblyWithStepDefs" }
    ]
}

Second: modify the project file (.csproj) so the specflow.json file is always copied to the output directory

  <ItemGroup>
    <None Update="specflow.json">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>

SpecFlow. Couldn't load file or assembly

4 Answers4