public function test_clear_returns_an_empty_collection()
{
$col = new Collection('TestClassA', [new TestClassA(1)]);
//col will have one
$this->assertEquals(1, $col->count());
//empty should have no items
$empty = $col->clear();
$this->assertEquals(0, $empty->count());
//col should remain unchanged
$this->assertEquals(1, $col->count());
}
public function test_add_item_creates_new_col_with_item()
{
$col = new Collection('TestClassA');
//count should be zero
$this->assertEquals(0, $col->count());
$a = new TestClassA(1);
//add the item
$col2 = $col->add($a);
//col should be unchanged
$this->assertEquals(0, $col->count());
$this->assertEquals(1, $col2->count());
$this->assertEquals($a, $col2->at(0));
}
public function test_add_range_adds_new_collection_with_items()
{
$col = new Collection('TestClassA');
$range = [new TestClassA(0), new TestClassA(1)];
$withRange = $col->merge($range);
$this->assertEquals(0, $col->count());
$this->assertEquals(2, $withRange->count());
$this->assertEquals($range, $withRange->toArray());
}
public function test_that_tail_gives_you_everything_but_head()
{
$col = new Collection('int', [1, 2, 3]);
$tail = $col->tail();
$this->assertEquals(2, $tail->count());
//col shouldn't be changed and should have 3 items
$this->assertEquals(3, $col->count());
//check that tail has two and three
$this->assertEquals(2, $tail->at(0));
$this->assertEquals(3, $tail->at(1));
}
