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Upgrading to NUnit 3.0 - OneTimeSetUp: SetUpAttribute attribute not allowed in a SetUpFixture

After upgrading to NUnit 3.0, which became recently available, some of my tests started to fail.

When I look at the test results, they all failed with the following error message:

SetUpAttribute attribute not allowed in a SetUpFixture

In NUnit 3.0, there are some breaking changes regarding the usage of the SetUpAttribute and the SetUpFixture.  You can no longer use the SetUpAttribute and TearDownAttribute inside a SetUpFixture. Instead you have to use the OneTimeSetUpAttribute and OneTimeTearDownAttribute.

In NUnit 2.0, I had the following code:

In NUnit 3.0, this has to change to:

More information can be found here:

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