Assert.True - jnm2/nunit-docs-wiki GitHub Wiki
Assert.True and Assert.IsTrue test that the specified condition is true. The two forms are provided for compatibility with past versions of NUnit and NUnitLite.
Assert.True(bool condition);
Assert.True(bool condition, string message, params object[] parms);
Assert.IsTrue(bool condition);
Assert.IsTrue(bool condition, string message, params object[] parms);
You may also use Assert.That with a boolean argument to achieve the same result.