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Add Boundary Test to MultiplicationWithoutMultiplyTest #54

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Add Boundary Test to MultiplicationWithoutMultiplyTest #54

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23 changes: 23 additions & 0 deletions src/test/java/com/github/pedrovgs/problem20/MultiplicationWithoutMultiplyTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@
*/
public class MultiplicationWithoutMultiplyTest {

private final static int MAX_INT = Integer.MAX_VALUE;
private final static int MIN_INT = -MAX_INT;

private MultiplicationWithoutMultiply multiply;

@Before public void setUp() {
Expand All @@ -46,4 +49,24 @@ public class MultiplicationWithoutMultiplyTest {
@Test public void shouldTakeIntoAccountNegativeNumbers() {
assertEquals(-14, multiply.calculate(-2, 7));
}

@Test public void boundaryTest() {
assertEquals(0, multiply.calculate(0, MAX_INT));
assertEquals(0, multiply.calculate(0, MIN_INT));
assertEquals(MAX_INT, multiply.calculate(1, MAX_INT));
assertEquals(MIN_INT, multiply.calculate(1, MIN_INT));
assertEquals(1, multiply.calculate(MAX_INT, MAX_INT));
assertEquals(1, multiply.calculate(MIN_INT, MIN_INT));
}

@Test public void strongBoundaryTest() {
assertEquals(4, multiply.calculate(MAX_INT - 1, MAX_INT - 1));
assertEquals(0, multiply.calculate(MAX_INT + 1, MAX_INT + 1));
assertEquals(4, multiply.calculate(MIN_INT + 1, MIN_INT + 1));
assertEquals(0, multiply.calculate(MIN_INT - 1, MIN_INT - 1));
assertEquals(0, multiply.calculate(0, MAX_INT - 1));
assertEquals(0, multiply.calculate(0, MIN_INT - 1));
assertEquals(MAX_INT - 1, multiply.calculate(1, MAX_INT - 1));
assertEquals(MIN_INT - 1, multiply.calculate(1, MIN_INT - 1));
}
}