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ForthEvaluatorTest.java
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355 lines (292 loc) · 12.2 KB
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import org.junit.Before;
import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.util.Arrays;
import java.util.Collections;
import static org.junit.Assert.assertEquals;
/*
* version: 1.2.0
*/
public class ForthEvaluatorTest {
@Rule
public ExpectedException expectedException = ExpectedException.none();
private ForthEvaluator forthEvaluator;
@Before
public void setUp() {
forthEvaluator = new ForthEvaluator();
}
@Test
public void testEmptyProgramResultsInEmptyStack() {
assertEquals(
Collections.emptyList(),
forthEvaluator.evaluateProgram(Collections.emptyList()));
}
@Ignore("Remove to run test")
@Test
public void testNumbersAreJustPushedOntoTheStack() {
assertEquals(
Arrays.asList(1, 2, 3, 4, 5),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 3 4 5")));
}
@Ignore("Remove to run test")
@Test
public void testTwoNumbersCanBeAdded() {
assertEquals(
Collections.singletonList(3),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 +")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfAdditionAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Addition requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("+"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfAdditionAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Addition requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 +"));
}
@Ignore("Remove to run test")
@Test
public void testTwoNumbersCanBeSubtracted() {
assertEquals(
Collections.singletonList(-1),
forthEvaluator.evaluateProgram(Collections.singletonList("3 4 -")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfSubtractionAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Subtraction requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("-"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfSubtractionAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Subtraction requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 -"));
}
@Ignore("Remove to run test")
@Test
public void testTwoNumbersCanBeMultiplied() {
assertEquals(
Collections.singletonList(8),
forthEvaluator.evaluateProgram(Collections.singletonList("2 4 *")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfMultiplicationAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Multiplication requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("*"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfMultiplicationAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Multiplication requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 *"));
}
@Ignore("Remove to run test")
@Test
public void testTwoNumbersCanBeDivided() {
assertEquals(
Collections.singletonList(4),
forthEvaluator.evaluateProgram(Collections.singletonList("12 3 /")));
}
@Ignore("Remove to run test")
@Test
public void testThatIntegerDivisionIsUsed() {
assertEquals(
Collections.singletonList(2),
forthEvaluator.evaluateProgram(Collections.singletonList("8 3 /")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfDividingByZero() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Division by 0 is not allowed");
forthEvaluator.evaluateProgram(Collections.singletonList("4 0 /"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfDivisionAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Division requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("/"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfDivisionAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Division requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 /"));
}
@Ignore("Remove to run test")
@Test
public void testCombinedAdditionAndSubtraction() {
assertEquals(
Collections.singletonList(-1),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 + 4 -")));
}
@Ignore("Remove to run test")
@Test
public void testCombinedMultiplicationAndDivision() {
assertEquals(
Collections.singletonList(2),
forthEvaluator.evaluateProgram(Collections.singletonList("2 4 * 3 /")));
}
@Ignore("Remove to run test")
@Test
public void testDupCopiesTheTopValueOnTheStack() {
assertEquals(
Arrays.asList(1, 1),
forthEvaluator.evaluateProgram(Collections.singletonList("1 DUP")));
}
@Ignore("Remove to run test")
@Test
public void testDupParsingIsCaseInsensitive() {
assertEquals(
Arrays.asList(1, 2, 2),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 Dup")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfDuplicatingAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Duplicating requires that the stack contain at least 1 value");
forthEvaluator.evaluateProgram(Collections.singletonList("dup"));
}
@Ignore("Remove to run test")
@Test
public void testDropRemovesTheTopValueOnTheStackIfItIsTheOnlyOne() {
assertEquals(
Collections.emptyList(),
forthEvaluator.evaluateProgram(Collections.singletonList("1 drop")));
}
@Ignore("Remove to run test")
@Test
public void testDropRemovesTheTopValueOnTheStackIfItIsNotTheOnlyOne() {
assertEquals(
Collections.singletonList(1),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 drop")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfDroppingAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Dropping requires that the stack contain at least 1 value");
forthEvaluator.evaluateProgram(Collections.singletonList("drop"));
}
@Ignore("Remove to run test")
@Test
public void testSwapSwapsTheTopTwosValueOnTheStackIfTheyAreTheOnlyOnes() {
assertEquals(
Arrays.asList(2, 1),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 swap")));
}
@Ignore("Remove to run test")
@Test
public void testSwapSwapsTheTopTwosValueOnTheStackIfTheyAreNotTheOnlyOnes() {
assertEquals(
Arrays.asList(1, 3, 2),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 3 swap")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfSwappingAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Swapping requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("swap"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfSwappingAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Swapping requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 swap"));
}
@Ignore("Remove to run test")
@Test
public void testOverCopiesTheSecondElementIfThereAreOnlyTwo() {
assertEquals(
Arrays.asList(1, 2, 1),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 over")));
}
@Ignore("Remove to run test")
@Test
public void testOverCopiesTheSecondElementIfThereAreMoreThanTwo() {
assertEquals(
Arrays.asList(1, 2, 3, 2),
forthEvaluator.evaluateProgram(Collections.singletonList("1 2 3 over")));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfOveringAttemptedWithNothingOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Overing requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("over"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfOveringAttemptedWithOneNumberOnTheStack() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Overing requires that the stack contain at least 2 values");
forthEvaluator.evaluateProgram(Collections.singletonList("1 over"));
}
@Ignore("Remove to run test")
@Test
public void testUserDefinedOperatorsCanConsistOfBuiltInOperators() {
assertEquals(
Arrays.asList(1, 1, 1),
forthEvaluator.evaluateProgram(Arrays.asList(": dup-twice dup dup ;", "1 dup-twice")));
}
@Ignore("Remove to run test")
@Test
public void testUserDefinedOperatorsAreEvaluatedInTheCorrectOrder() {
assertEquals(
Arrays.asList(1, 2, 3),
forthEvaluator.evaluateProgram(Arrays.asList(": countup 1 2 3 ;", "countup")));
}
@Ignore("Remove to run test")
@Test
public void testCanRedefineAUserDefinedOperator() {
assertEquals(
Arrays.asList(1, 1, 1),
forthEvaluator.evaluateProgram(Arrays.asList(": foo dup ;", ": foo dup dup ;", "1 foo")));
}
@Ignore("Remove to run test")
@Test
public void testCanOverrideBuiltInWordOperators() {
assertEquals(
Arrays.asList(1, 1),
forthEvaluator.evaluateProgram(Arrays.asList(": swap dup ;", "1 swap")));
}
@Ignore("Remove to run test")
@Test
public void testCanOverrideBuiltInArithmeticOperators() {
assertEquals(
Collections.singletonList(12),
forthEvaluator.evaluateProgram(Arrays.asList(": + * ;", "3 4 +")));
}
@Ignore("Remove to run test")
@Test
public void testCannotRedefineNumbers() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Cannot redefine numbers");
forthEvaluator.evaluateProgram(Collections.singletonList(": 1 2 ;"));
}
@Ignore("Remove to run test")
@Test
public void testErrorIfEvaluatingAnUndefinedOperator() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("No definition available for operator \"foo\"");
forthEvaluator.evaluateProgram(Collections.singletonList("foo"));
}
}