Unit Test Assert.AreEqual failed?

If you want to compare two different instances of Supplier, and want them to be considered equal when certain properties have the same value, you have to override the Equals method on Supplier and compare those properties in the method.

As every other answer says the issue is that you're trying to compare instances of Supplier probably without overriding Equals method. But I do not think you should override Equals for test purposes since it may affect production code or you may need another Equals logic in production code.

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