public void OrExpressionReturnsFalseWhenBothOperandAreFalse()
{
{
IExpression left = new ConstantTerminalExpression(false);
IExpression right = new ConstantTerminalExpression(false);
IExpression or = new OrExpression(left, right);
Assert.AreEqual(false, or.Interpret(new Context()));
}
{
IExpression left = new VariableTerminalExpression("a");
IExpression right = new VariableTerminalExpression("b");
IExpression or = new OrExpression(left, right);
Assert.AreEqual(false, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", false }
})));
}
{
// false || a => false for a = false
IExpression left = new ConstantTerminalExpression(false);
IExpression right = new VariableTerminalExpression("a");
IExpression or = new OrExpression(left, right);
Assert.AreEqual(false, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", true }
})));
}
{
// a || !b => false for a = false and b = true
IExpression left = new VariableTerminalExpression("a");
IExpression right = new NotExpression(new VariableTerminalExpression("b"));
IExpression or = new OrExpression(left, right);
Assert.AreEqual(false, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", true }
})));
}
}
public void OrExpressionReturnsTrueWhenAnyOperandIsTrue()
{
{
// true || false => true
IExpression left = new ConstantTerminalExpression(true);
IExpression right = new ConstantTerminalExpression(false);
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context()));
}
{
// true || false => true
IExpression left = new ConstantTerminalExpression(false);
IExpression right = new ConstantTerminalExpression(true);
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context()));
}
{
// true || true => true
IExpression left = new ConstantTerminalExpression(true);
IExpression right = new ConstantTerminalExpression(true);
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context()));
}
{
// a || b => true for a = false and b = true
IExpression left = new VariableTerminalExpression("a");
IExpression right = new VariableTerminalExpression("b");
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", true }
})));
}
{
// a || b => true for a = true and b = false
IExpression left = new VariableTerminalExpression("a");
IExpression right = new VariableTerminalExpression("b");
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", true }, { "b", false }
})));
}
{
// false || b => true for b = true
IExpression left = new ConstantTerminalExpression(false);
IExpression right = new VariableTerminalExpression("b");
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", true }
})));
}
{
// a || true => true for a = false
IExpression left = new VariableTerminalExpression("a");
IExpression right = new ConstantTerminalExpression(true);
IExpression or = new OrExpression(left, right);
Assert.AreEqual(true, or.Interpret(new Context(new Dictionary <string, bool>()
{
{ "a", false }, { "b", true }
})));
}
}