public void ToString_MultipleVariablesInTruthTable_NumberOfPiecesShouldBeEquivalentToNumberOfVariablesPlusOneForResultColumn(string toParseExpression)
{
// Arrange
parser = new Parser(toParseExpression);
Proposition root = parser.Parse();
TruthTable tt = new TruthTable(root);
int numberOfVariables = root.GetVariables().Count;
int numberOfExpectedParts = numberOfVariables + 1;
// Act
String result = tt.TableHeader();
String[] parts = result.Split(TruthTableRow.GetPadding());
// Assert
parts.Length.Should().Be(numberOfExpectedParts, "Because the string should display a value for each variable and a result");
}