40 lines
1.4 KiB
Java
40 lines
1.4 KiB
Java
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package function.builtin.special;
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import static testutil.TestUtilities.assertSExpressionsMatch;
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import static testutil.TestUtilities.evaluateString;
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import static testutil.TestUtilities.parseString;
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import org.junit.Test;
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import function.ArgumentValidator.BadArgumentTypeException;
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import function.builtin.special.RECUR.RecurOutsideOfFunctionException;
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import testutil.SymbolAndFunctionCleaner;
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public class RECURTest extends SymbolAndFunctionCleaner {
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@Test(expected = RecurOutsideOfFunctionException.class)
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public void recurOutsideOfFunction_ThrowsException() {
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evaluateString("(recur)");
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}
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@Test(expected = RecurOutsideOfFunctionException.class)
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public void recurOutsideOfFunction_AfterFunctionCall_ThrowsException() {
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evaluateString("(defun f (n) (if (= n 0) 'ZERO n))");
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evaluateString("(f 2)");
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evaluateString("(recur)");
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}
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@Test
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public void recurCallsCurrentFunction() {
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evaluateString("(defun tail-recursive (n) (if (= n 0) 'PASS (recur (- n 1))))");
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assertSExpressionsMatch(parseString("PASS"), evaluateString("(tail-recursive 900)"));
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}
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@Test(expected = BadArgumentTypeException.class)
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public void recurInSpecialFunction_DoesNotEvaluateArguments() {
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evaluateString("(define-special tail-recursive (n) (if (= n 0) 'PASS (recur (- n 1))))");
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evaluateString("(tail-recursive 900)");
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}
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}
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