public void AddFunction_AlreadyDefinedSymbol_ThrowsException()
{
Environment environment = new Environment();
DefinedSymbolException exception = Assert.Throws <DefinedSymbolException>(() => {
environment.AddFunction("sin", null);
});
Assert.AreEqual("Symbol sin has already been defined", exception.Message);
}
public void AddValue_AlreadyDefinedSymbol_ThrowsException()
{
Environment environment = new Environment();
environment.AddValue("x", 2);
DefinedSymbolException exception = Assert.Throws <DefinedSymbolException>(() => {
environment.AddSymbol("x");
});
Assert.AreEqual("Symbol x has already been defined", exception.Message);
}