Telerik JustMock
var foo = Mock.Create<FooGeneric<int>>();
[TestMethod]
public void ShouldMockGenericMethodInNonGenericClass()
{
//Arrange
var foo = Mock.Create<Foo>();
Mock.Arrange(() => foo.Get<int, int>(1)).Returns(10);
// Act
var actual = foo.Get<int, int>(1);
//Assert
Assert.AreEqual(10, actual);
}