public void GetVariablesTest()
{
string input = "=(&(~(b), a),|(=(c,d),>(e,f)))";
Proposition check = new Proposition(input);
Assert.AreEqual(6, check.GetVariables().Count());
}
public void GetVariables_CallToGetVariables_ShouldReturnEmptyListSinceConstantHasNoVariableSymbols()
{
// Arrange
int expectedNumberOfVariables = 0;
// Act
List <Proposition> actualVariablesInProposition = constant.GetVariables();
// Assert
actualVariablesInProposition.Count.Should().Be(expectedNumberOfVariables, "because a constant has no variable symbols in its expression");
}
public void Constructor_ConstructWithVariablesAlreadySetOnProposition_ShouldResultInAProperlyConstructedObjectWithANumberOfRowsEqualToNumberOfVariablesToThePowerOfTwo(string toParseExpression, int expectedNumberOfRows)
{
// Arrange
parser = new Parser(toParseExpression);
Proposition root = parser.Parse();
// Act
root.UniqueVariableSet = root.GetVariables();
TruthTable tt = new TruthTable(root);
int actualNumberOfRows = tt.Rows.Count;
// Assert
actualNumberOfRows.Should().Be(expectedNumberOfRows);
}
public void GetVariables_CallGetVariablesOnARandomValidProposition_ExpectedListReturnedWithTheVariableAsIndividualElement()
{
// Arrange
Proposition validProposition = PropositionGenerator.GetRandomPropositionSymbol();
int expectedNumberOfElements = 1;
// Act
List <Proposition> propositionVariables = validProposition.GetVariables();
// Assert
propositionVariables.Count.Should().Be(expectedNumberOfElements, "because the proposition variable is an individual variable");
propositionVariables[0].Should().BeEquivalentTo(validProposition, "because the proposition variable itself is the actual proposition");
}
public void Parse_UniqueSymbolCharactersInExpression_ShouldResultInUniqueVariables()
{
// Arrange
string proposition = "~(&(|(A, B), C))";
int expectedNumberOfVariables = 3;
parser = new Parser(proposition);
// Act
Proposition root = parser.Parse();
List <Proposition> expressionVariables = root.GetVariables();
// Assert
expressionVariables.Count.Should().Be(expectedNumberOfVariables, "because there should be one proposition variable for each unique character");
}
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");
}
public void GetSimplifiedExpression_ExpressionWithoutDoNotCareVariableGiven_ExpectedEqualNumberOfVariablesInProposition(string nonSimplifiableExpression)
{
// Arrange
parser = new Parser(nonSimplifiableExpression);
Proposition nonSimplifiableProposition = parser.Parse();
TruthTable truthTable = new TruthTable(nonSimplifiableProposition);
TruthTable simplifiedTruthTable = truthTable.Simplify();
Proposition afterSimplifying = simplifiedTruthTable.GetSimplifiedExpression();
// Act
int numberOfVariablesInOriginal = nonSimplifiableProposition.GetVariables().Count;
int actualNumberOfVariablesInSimplified = afterSimplifying.GetVariables().Count;
int actualNumberOfDontCareVariables = numberOfVariablesInOriginal - actualNumberOfVariablesInSimplified;
// Assert
actualNumberOfDontCareVariables.Should().Be(0, $"Because the proposition could NOT be simplified thus should have a difference of 0");
}
public void GetSimplifiedExpression_ExpressionWithDoNotCareVariableGiven_ExpectedDoNoCareVariableToBeRemovedFromProposition(string simplifiableExpression, int numberOfDoNotCareVariables)
{
// Arrange
parser = new Parser(simplifiableExpression);
Proposition simplifiableProposition = parser.Parse();
TruthTable truthTable = new TruthTable(simplifiableProposition);
TruthTable simplifiedTruthTable = truthTable.Simplify();
Proposition afterSimplifying = simplifiedTruthTable.GetSimplifiedExpression();
// Act
int numberOfVariablesInOriginal = simplifiableProposition.GetVariables().Count;
int actualNumberOfVariablesInSimplified = afterSimplifying.GetVariables().Count;
int actualNumberOfDontCareVariables = numberOfVariablesInOriginal - actualNumberOfVariablesInSimplified;
// Assert
actualNumberOfDontCareVariables.Should().Be(numberOfDoNotCareVariables, $"Because the proposition could be simplified and {numberOfDoNotCareVariables} variables should be removed from the original expression that has {numberOfVariablesInOriginal} variables");
}
public void Parse_SameSymbolCharacterInExpression_ShouldBeSameObject()
{
// Arrange
char randomSymbol = PropositionGenerator.GetRandomVariableLetter();
char randomConnective = PropositionGenerator.GetRandomConnectiveSymbol();
string proposition = $"{randomConnective}({randomSymbol}, {randomSymbol})";
int expectedNumberOfVariables = 1;
parser = new Parser(proposition);
// Act
Proposition root = parser.Parse();
List <Proposition> expressionVariables = root.GetVariables();
// Assert
expressionVariables.Count.Should().Be(expectedNumberOfVariables, "because there should be one proposition variable for each unique character");
expressionVariables[0].Data.Should().Be(randomSymbol, "because that is the only given symbol");
}
