function CtoolsMathExpressionStackTestCase::testStack

Test the math expression stack system.

File

tests/math_expression_stack.test, line 32

Class

CtoolsMathExpressionStackTestCase

Tests the simple MathExpressionStack class.

Code

public function testStack() {
    $stack = new ctools_math_expr_stack();
    // Test the empty stack.
    $this->assertNull($stack->last());
    $this->assertNull($stack->pop());
    // Add an element and see whether it's the right element.
    $value = $this->randomName();
    $stack->push($value);
    $this->assertIdentical($value, $stack->last());
    $this->assertIdentical($value, $stack->pop());
    $this->assertNull($stack->pop());
    // Add multiple elements and see whether they are returned in the right
    // order.
    $values = array(
        $this->randomName(),
        $this->randomName(),
        $this->randomName(),
    );
    foreach ($values as $value) {
        $stack->push($value);
    }
    // Test the different elements at different positions with the last()
    // method.
    $count = count($values);
    foreach ($values as $key => $value) {
        $this->assertEqual($value, $stack->last($count - $key));
    }
    // Pass in a non-valid number to last.
    $non_valid_number = rand(10, 20);
    $this->assertNull($stack->last($non_valid_number));
    // Test the order of the poping.
    $values = array_reverse($values);
    foreach ($values as $key => $value) {
        $this->assertEqual($stack->last(), $value);
        $this->assertEqual($stack->pop(), $value);
    }
    $this->assertNull($stack->pop());
}