public void ReadEvaluatePrintLoop_WithNullParser_ThrowsArgumentNullException()
{
IRunTimeEnvironment rte = MakeRunTimeEnvironment("PRINT \"Windows\";");
ILineParser parser = null;
var repl = new ReadEvaluatePrintLoop(rte, parser);
}
public void ReadEvaluatePrintLoop_WithNullRte_ThrowsArgumentNullException()
{
IRunTimeEnvironment rte = null;
ILineParser parser = MakeParser();
var repl = new ReadEvaluatePrintLoop(rte, parser);
}
public void IsOver_AfterCreation_IsFalse()
{
var parser = MakeParser();
var rte = MakeRunTimeEnvironment("PRINT \"Windows\";");
var repl = new ReadEvaluatePrintLoop(rte, parser);
Assert.IsFalse(repl.IsOver);
}
public void DoEvaluateImmediately_WithNull_ThrowsArgumentNullException()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
var condition = repl.DoEvaluateImmediately(null);
}
public void IsOver_WhenRteClosed_IsTrue()
{
var parser = MakeParser();
var rte = MakeRunTimeEnvironment("PRINT \"Windows\";");
var repl = new ReadEvaluatePrintLoop(rte, parser);
rte.Close();
Assert.IsTrue(repl.IsOver);
}
public void Evalate_WhenLineWithNumbered_AddsItToLines()
{
var parser = MakeParser();
var rte = MakeRunTimeEnvironment();
var repl = new ReadEvaluatePrintLoop(rte, parser);
var line = new Line("10", MakeStatement());
var result = repl.Evaluate(line);
Assert.IsTrue(rte.Lines.Contains(line));
}
public void Read_WithPrintStatement_ReturnsParsedPrintStatement()
{
var parser = MakeParser();
var rte = MakeRunTimeEnvironment("PRINT \"Windows\";");
var repl = new ReadEvaluatePrintLoop(rte, parser);
var result = repl.Read();
var actual = result.Statement;
Assert.IsInstanceOfType(actual, typeof(Print));
}
public void Print_WithNonEmptyResult_PrintsMessage()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
var result = new EvaluateResult("message");
repl.Print(result);
Assert.AreEqual("message", inputOutput.OutputStrings[0]);
}
public void Evaluate_WhenLineWithoutNumber_RunsStatementImmediately()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
var line = new Line(MakeStatement(() => inputOutput.Write("Windows")));
var result = repl.Evaluate(line);
Assert.AreEqual("Windows", inputOutput.OutputStrings[0]);
}
public void TakeStep_WithLetStatement_ReturnsTheResultOfExpression()
{
var inputOutput = MakeInputOutput("LET foo = 2.718281828");
var rte = MakeRunTimeEnvironment(inputOutput);
var parser = MakeParser();
var repl = new ReadEvaluatePrintLoop(rte, parser);
repl.TakeStep();
var actual = inputOutput.OutputStrings[0];
Assert.AreEqual("2.718281828", actual);
}
public void Print_WithEmptyResult_DoesntPrintSomething()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
inputOutput.Write("still message");
repl.Print(EvaluateResult.None);
Assert.AreEqual("still message", inputOutput.OutputStrings[0]);
}
public void Evaluate_WithResultedStatement_ReturnsResult()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
var statement = MakeStatement(new EvaluateResult("message"));
var result = repl.Evaluate(statement);
Assert.AreEqual("message", result.Message);
}
public void Evaluate_WithExceptedStatement_ThrowsRunTimeException()
{
var parser = MakeParser();
var inputOutput = MakeInputOutput();
var rte = MakeRunTimeEnvironment(inputOutput);
var repl = new ReadEvaluatePrintLoop(rte, parser);
var statement = MakeStatement(() => { throw new Exception(); });
repl.Evaluate(statement);
var condition = repl.DoEvaluateImmediately(null);
}
