@Test
public void testDivide() {
a = 8;
b = 2;
int result = calculator.divide(a, b);
Assert.assertEquals(a / b, result);
a = 8;
b = -2;
result = calculator.divide(a, b);
Assert.assertEquals(a / b, result);
}
@Test
public void testDivideByZero() {
a = 20;
b = 0;
Integer result = calculator.divide(a, b);
Assert.assertNull(result);
}
@Test
public void testSum() {
a = 2;
b = -3;
int result = calculator.sum(a, b);
Assert.assertEquals(a + b, result);
a = 0;
b = -1093038;
result = calculator.sum(a, b);
Assert.assertEquals(a + b, result);
a = -6;
b = -3;
result = calculator.sum(a, b);
Assert.assertEquals(a + b, result);
}
@Test
public void testSquareRoot() {
final double DELTA = 1e-15;
a = 0;
double result = calculator.squareRoot(a);
Assert.assertEquals(Math.sqrt(a), result, DELTA);
a = 1;
result = calculator.squareRoot(a);
Assert.assertEquals(Math.sqrt(a), result, DELTA);
a = 25;
result = calculator.squareRoot(a);
Assert.assertEquals(Math.sqrt(a), result, DELTA);
a = 1544646;
result = calculator.squareRoot(a);
Assert.assertEquals(Math.sqrt(a), result, DELTA);
}
@Test
public void testMultiply() {
a = -6;
b = -3;
int result = calculator.multiply(a, b);
Assert.assertEquals(a * b, result);
a = -6;
b = 18;
result = calculator.multiply(a, b);
Assert.assertEquals(a * b, result);
a = 1;
b = 3930393;
result = calculator.multiply(a, b);
Assert.assertEquals(a * b, result);
a = 0;
b = 3930393;
result = calculator.multiply(a, b);
Assert.assertEquals(a * b, result);
}
@Test
public void addition() {
assertEquals(12, calculator.add(7, 5));
}
@After
public void runAfterEveryTest() {
calculator.shutdown();
}
@Ignore("Still under development")
@Test
public void multiplication() {
assertEquals(15, calculator.multiply(3, 5));
}
@Test(expected = Exception.class)
public void divisionWithException() {
// divide by zero
calculator.divide(42, 0);
}
@Test
public void subtraction() {
assertEquals(9, calculator.substract(12, 3));
}
@Test
public void testSquareRootWithNegativeNumber() {
a = -26665;
Double result = calculator.squareRoot(a);
Assert.assertNull(result);
}
@Test
public void geometricMeanTwoNegativeOperandsExpression() {
double result = Calculator.getResult(-2, -8, Calculator.OPERATOR.GEOMETRIC_MEAN);
Assert.assertTrue(Double.isNaN(result));
}
@Test
public void minusExpression() {
double result = Calculator.getResult(2, 2, Calculator.OPERATOR.MINUS);
Assert.assertEquals(0.0, result, 0.0);
}
