/**
* Input a value that serves as the radius
* of a sphere and returns the volume.
*
* @covers Sphere::volume
*/
public function testSphereVolumeComputationIsCorrect()
{
//Set a mock value for the sphere's radius.
//and compute the volume based on the
//volume math formula for a sphere.
$radius = 20;
$volume = 4 / 3 * pi() * pow($radius, 3);
$this->assertEquals($this->sphere->volume(), $volume);
}
public function testItCanCalculateVolume()
{
$circle = new Sphere(0);
$this->assertEquals(0, $circle->volume());
$circle = new Sphere(2);
$value = 4 / 3 * pi() * pow(2, 3);
$this->assertEquals($value, $circle->volume());
$circle = new Sphere(3.14);
$value = 4 / 3 * pi() * pow(3.14, 3);
$this->assertEquals($value, $circle->volume());
}
