67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
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package function;
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import static org.junit.Assert.assertEquals;
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import org.junit.Test;
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import function.ArgumentValidator.*;
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import sexpression.*;
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public class UserDefinedFunctionTester {
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private static final String FUNCTION_NAME = "TEST";
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private UserDefinedFunction createNoArgumentFunctionThatReturnsNil() {
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return new UserDefinedFunction(FUNCTION_NAME, Nil.getUniqueInstance(),
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new Cons(Nil.getUniqueInstance(), Nil.getUniqueInstance()));
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}
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private UserDefinedFunction createOneArgumentFunctionThatReturnsArgument() {
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return new UserDefinedFunction(FUNCTION_NAME, new Cons(new Symbol("X"), Nil.getUniqueInstance()),
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new Cons(new Symbol("X"), Nil.getUniqueInstance()));
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}
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@Test
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public void testNilFunctionCall() {
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UserDefinedFunction function = createNoArgumentFunctionThatReturnsNil();
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assertEquals(Nil.getUniqueInstance(), function.call(Nil.getUniqueInstance()));
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}
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@Test
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public void testNilFunctionToString() {
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UserDefinedFunction function = createNoArgumentFunctionThatReturnsNil();
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Cons expected = new Cons(new Symbol(FUNCTION_NAME),
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new Cons(Nil.getUniqueInstance(),
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new Cons(Nil.getUniqueInstance(), Nil.getUniqueInstance())));
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assertEquals(expected.toString(), function.getLambdaExpression().toString());
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}
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@Test
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public void oneArgumentFunction_ReturnsCorrectValue() {
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UserDefinedFunction function = createOneArgumentFunctionThatReturnsArgument();
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SExpression argument = new LispNumber(23);
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Cons argumentList = new Cons(argument, Nil.getUniqueInstance());
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assertEquals(argument.toString(), function.call(argumentList).toString());
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}
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@Test(expected = TooManyArgumentsException.class)
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public void oneArgumentFunction_ThrowsExceptionWithTooManyArguments() {
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UserDefinedFunction function = createOneArgumentFunctionThatReturnsArgument();
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SExpression argument = new LispNumber(23);
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Cons argumentList = new Cons(argument, new Cons(argument, Nil.getUniqueInstance()));
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function.call(argumentList);
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}
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@Test(expected = TooFewArgumentsException.class)
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public void oneArgumentFunction_ThrowsExceptionWithTooFewArguments() {
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UserDefinedFunction function = createOneArgumentFunctionThatReturnsArgument();
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function.call(Nil.getUniqueInstance());
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}
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}
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