- <?php
- * @file
- * Provides unit tests for graph.inc.
- */
-
- * Unit tests for the graph handling features.
- */
- class GraphUnitTest extends BackdropUnitTestCase {
- function setUp() {
- require_once BACKDROP_ROOT . '/core/includes/graph.inc';
- parent::setUp();
- }
-
-
- * Test depth-first-search features.
- */
- function testDepthFirstSearch() {
-
-
-
-
-
-
- $graph = $this->normalizeGraph(array(
- 1 => array(2),
- 2 => array(3, 4),
- 3 => array(),
- 4 => array(3),
- 5 => array(6),
- 7 => array(4, 5),
- 8 => array(9),
- 9 => array(),
- ));
- backdrop_depth_first_search($graph);
-
- $expected_paths = array(
- 1 => array(2, 3, 4),
- 2 => array(3, 4),
- 3 => array(),
- 4 => array(3),
- 5 => array(6),
- 7 => array(4, 3, 5, 6),
- 8 => array(9),
- 9 => array(),
- );
- $this->assertPaths($graph, $expected_paths);
-
- $expected_reverse_paths = array(
- 1 => array(),
- 2 => array(1),
- 3 => array(2, 1, 4, 7),
- 4 => array(2, 1, 7),
- 5 => array(7),
- 7 => array(),
- 8 => array(),
- 9 => array(8),
- );
- $this->assertReversePaths($graph, $expected_reverse_paths);
-
-
- $this->assertFALSE(isset($graph[6]), 'Vertex 6 has not been created');
-
- $expected_components = array(
- array(1, 2, 3, 4, 5, 7),
- array(8, 9),
- );
- $this->assertComponents($graph, $expected_components);
-
- $expected_weights = array(
- array(1, 2, 3),
- array(2, 4, 3),
- array(7, 4, 3),
- array(7, 5),
- array(8, 9),
- );
- $this->assertWeights($graph, $expected_weights);
- }
-
-
- * Return a normalized version of a graph.
- */
- function normalizeGraph($graph) {
- $normalized_graph = array();
- foreach ($graph as $vertex => $edges) {
-
- $normalized_graph[$vertex] = array();
- foreach ($edges as $edge) {
- $normalized_graph[$vertex]['edges'][$edge] = TRUE;
- }
- }
- return $normalized_graph;
- }
-
-
- * Verify expected paths in a graph.
- *
- * @param $graph
- * A graph array processed by backdrop_depth_first_search().
- * @param $expected_paths
- * An associative array containing vertices with their expected paths.
- */
- function assertPaths($graph, $expected_paths) {
- foreach ($expected_paths as $vertex => $paths) {
-
- $expected = array_fill_keys($paths, TRUE);
- $result = isset($graph[$vertex]['paths']) ? $graph[$vertex]['paths'] : array();
- $this->assertEqual($expected, $result, format_string('Expected paths for vertex @vertex: @expected-paths, got @paths', array(
- '@vertex' => $vertex,
- '@expected-paths' => $this->displayArray($expected, TRUE),
- '@paths' => $this->displayArray($result, TRUE),
- )));
- }
- }
-
-
- * Verify expected reverse paths in a graph.
- *
- * @param $graph
- * A graph array processed by backdrop_depth_first_search().
- * @param $expected_reverse_paths
- * An associative array containing vertices with their expected reverse
- * paths.
- */
- function assertReversePaths($graph, $expected_reverse_paths) {
- foreach ($expected_reverse_paths as $vertex => $paths) {
-
- $expected = array_fill_keys($paths, TRUE);
- $result = isset($graph[$vertex]['reverse_paths']) ? $graph[$vertex]['reverse_paths'] : array();
- $this->assertEqual($expected, $result, format_string('Expected reverse paths for vertex @vertex: @expected-paths, got @paths', array(
- '@vertex' => $vertex,
- '@expected-paths' => $this->displayArray($expected, TRUE),
- '@paths' => $this->displayArray($result, TRUE),
- )));
- }
- }
-
-
- * Verify expected components in a graph.
- *
- * @param $graph
- * A graph array processed by backdrop_depth_first_search().
- * @param $expected_components
- * An array containing of components defined as a list of their vertices.
- */
- function assertComponents($graph, $expected_components) {
- $unassigned_vertices = array_fill_keys(array_keys($graph), TRUE);
- foreach ($expected_components as $component) {
- $result_components = array();
- foreach ($component as $vertex) {
- $result_components[] = $graph[$vertex]['component'];
- unset($unassigned_vertices[$vertex]);
- }
- $this->assertEqual(1, count(array_unique($result_components)), format_string('Expected one unique component for vertices @vertices, got @components', array(
- '@vertices' => $this->displayArray($component),
- '@components' => $this->displayArray($result_components),
- )));
- }
- $this->assertEqual(array(), $unassigned_vertices, format_string('Vertices not assigned to a component: @vertices', array('@vertices' => $this->displayArray($unassigned_vertices, TRUE))));
- }
-
-
- * Verify expected order in a graph.
- *
- * @param $graph
- * A graph array processed by backdrop_depth_first_search().
- * @param $expected_orders
- * An array containing lists of vertices in their expected order.
- */
- function assertWeights($graph, $expected_orders) {
- foreach ($expected_orders as $order) {
- $previous_vertex = array_shift($order);
- foreach ($order as $vertex) {
- $this->assertTrue($graph[$previous_vertex]['weight'] < $graph[$vertex]['weight'], format_string('Weights of @previous-vertex and @vertex are correct relative to each other', array('@previous-vertex' => $previous_vertex, '@vertex' => $vertex)));
- }
- }
- }
-
-
- * Helper function to output vertices as comma-separated list.
- *
- * @param $paths
- * An array containing a list of vertices.
- * @param $keys
- * (optional) Whether to output the keys of $paths instead of the values.
- */
- function displayArray($paths, $keys = FALSE) {
- if (!empty($paths)) {
- return implode(', ', $keys ? array_keys($paths) : $paths);
- }
- else {
- return '(empty)';
- }
- }
- }
-