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());
}