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MDL-76583 core_external: Move external_api unit tests
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@andrewnicols
andrewnicols committed Jan 18, 2023
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353 changes: 353 additions & 0 deletions lib/external/tests/external_api_test.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.

namespace core_external;

/**
* Unit tests for core_external\external_api.
*
* @package core_external
* @category test
* @copyright 2022 Andrew Lyons <andrew@nicols.co.uk>
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @covers \core_external\external_api
*/
class external_api_test extends \advanced_testcase {

public static function setUpBeforeClass(): void {
global $CFG;
require_once("{$CFG->libdir}/externallib.php");
}

/**
* Test the validate_parameters method.
*
* @covers \core_external\external_api::validate_parameters
*/
public function test_validate_params() {
$params = array('text'=>'aaa', 'someid'=>'6');
$description = new \external_function_parameters(array('someid' => new \external_value(PARAM_INT, 'Some int value'),
'text' => new \external_value(PARAM_ALPHA, 'Some text value')));
$result = external_api::validate_parameters($description, $params);
$this->assertCount(2, $result);
reset($result);
$this->assertSame('someid', key($result));
$this->assertSame(6, $result['someid']);
$this->assertSame('aaa', $result['text']);

$params = array('someids'=>array('1', 2, 'a'=>'3'), 'scalar'=>666);
$description = new \external_function_parameters(array('someids' => new \external_multiple_structure(new \external_value(PARAM_INT, 'Some ID')),
'scalar' => new \external_value(PARAM_ALPHANUM, 'Some text value')));
$result = external_api::validate_parameters($description, $params);
$this->assertCount(2, $result);
reset($result);
$this->assertSame('someids', key($result));
$this->assertEquals(array(0=>1, 1=>2, 2=>3), $result['someids']);
$this->assertSame('666', $result['scalar']);

$params = array('text'=>'aaa');
$description = new \external_function_parameters(array('someid' => new \external_value(PARAM_INT, 'Some int value', false),
'text' => new \external_value(PARAM_ALPHA, 'Some text value')));
$result = external_api::validate_parameters($description, $params);
$this->assertCount(2, $result);
reset($result);
$this->assertSame('someid', key($result));
$this->assertNull($result['someid']);
$this->assertSame('aaa', $result['text']);

$params = array('text'=>'aaa');
$description = new \external_function_parameters(array('someid' => new \external_value(PARAM_INT, 'Some int value', false, 6),
'text' => new \external_value(PARAM_ALPHA, 'Some text value')));
$result = external_api::validate_parameters($description, $params);
$this->assertCount(2, $result);
reset($result);
$this->assertSame('someid', key($result));
$this->assertSame(6, $result['someid']);
$this->assertSame('aaa', $result['text']);
}

/**
* Test for clean_returnvalue() for testing that returns the PHP type.
*
* @covers \core_external\external_api::clean_returnvalue
*/
public function test_clean_returnvalue_return_php_type() {

$returndesc = new \external_single_structure(
array(
'value' => new \external_value(PARAM_RAW, 'Some text', VALUE_OPTIONAL, null, NULL_NOT_ALLOWED)
)
);

// Check return type on exception because the external values does not allow NULL values.
$testdata = array('value' => null);
try {
$cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
} catch (\moodle_exception $e) {
$this->assertInstanceOf(\invalid_response_exception::class, $e);
$this->assertStringContainsString('of PHP type "NULL"', $e->debuginfo);
}
}

/**
* Test for clean_returnvalue().
*
* @covers external_api::clean_returnvalue
*/
public function test_clean_returnvalue() {

// Build some return value decription.
$returndesc = new \external_multiple_structure(
new \external_single_structure(
array(
'object' => new \external_single_structure(
array('value1' => new \external_value(PARAM_INT, 'this is a int'))),
'value2' => new \external_value(PARAM_TEXT, 'some text', VALUE_OPTIONAL))
));

// Clean an object (it should be cast into an array).
$object = new \stdClass();
$object->value1 = 1;
$singlestructure['object'] = $object;
$singlestructure['value2'] = 'Some text';
$testdata = array($singlestructure);
$cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
$cleanedsinglestructure = array_pop($cleanedvalue);
$this->assertSame($object->value1, $cleanedsinglestructure['object']['value1']);
$this->assertSame($singlestructure['value2'], $cleanedsinglestructure['value2']);

// Missing VALUE_OPTIONAL.
$object = new \stdClass();
$object->value1 = 1;
$singlestructure = new \stdClass();
$singlestructure->object = $object;
$testdata = array($singlestructure);
$cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
$cleanedsinglestructure = array_pop($cleanedvalue);
$this->assertSame($object->value1, $cleanedsinglestructure['object']['value1']);
$this->assertArrayNotHasKey('value2', $cleanedsinglestructure);

// Unknown attribute (the value should be ignored).
$object = array();
$object['value1'] = 1;
$singlestructure = array();
$singlestructure['object'] = $object;
$singlestructure['value2'] = 'Some text';
$singlestructure['unknownvalue'] = 'Some text to ignore';
$testdata = array($singlestructure);
$cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
$cleanedsinglestructure = array_pop($cleanedvalue);
$this->assertSame($object['value1'], $cleanedsinglestructure['object']['value1']);
$this->assertSame($singlestructure['value2'], $cleanedsinglestructure['value2']);
$this->assertArrayNotHasKey('unknownvalue', $cleanedsinglestructure);

// Missing required value (an exception is thrown).
$object = array();
$singlestructure = array();
$singlestructure['object'] = $object;
$singlestructure['value2'] = 'Some text';
$testdata = array($singlestructure);
$this->expectException('invalid_response_exception');
$cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
}

/**
* Test \core_external\external_api::get_context_from_params().
*
* @covers \core_external\external_api::get_context_from_params
*/
public function test_get_context_from_params() {
$this->resetAfterTest(true);
$course = $this->getDataGenerator()->create_course();
$realcontext = \context_course::instance($course->id);

// Use context id.
$fetchedcontext = $this->get_context_from_params(array("contextid" => $realcontext->id));
$this->assertEquals($realcontext, $fetchedcontext);

// Use context level and instance id.
$fetchedcontext = $this->get_context_from_params(array("contextlevel" => "course", "instanceid" => $course->id));
$this->assertEquals($realcontext, $fetchedcontext);

// Passing empty values.
try {
$fetchedcontext = $this->get_context_from_params(array("contextid" => 0));
$this->fail('Exception expected from get_context_wrapper()');
} catch (\moodle_exception $e) {
$this->assertInstanceOf(\invalid_parameter_exception::class, $e);
}

try {
$fetchedcontext = $this->get_context_from_params(array("instanceid" => 0));
$this->fail('Exception expected from get_context_wrapper()');
} catch (\moodle_exception $e) {
$this->assertInstanceOf(\invalid_parameter_exception::class, $e);
}

try {
$fetchedcontext = $this->get_context_from_params(array("contextid" => null));
$this->fail('Exception expected from get_context_wrapper()');
} catch (\moodle_exception $e) {
$this->assertInstanceOf(\invalid_parameter_exception::class, $e);
}

// Tests for context with instanceid equal to 0 (System context).
$realcontext = \context_system::instance();
$fetchedcontext = $this->get_context_from_params(array("contextlevel" => "system", "instanceid" => 0));
$this->assertEquals($realcontext, $fetchedcontext);

// Passing wrong level.
$this->expectException('invalid_parameter_exception');
$fetchedcontext = $this->get_context_from_params(array("contextlevel" => "random", "instanceid" => $course->id));
}

/**
* Test \core_external\external_api::get_context()_from_params parameter validation.
*
* @covers \core_external\external_api::get_context
*/
public function test_get_context_params() {
global $USER;

// Call without correct context details.
$this->expectException('invalid_parameter_exception');
$this->get_context_from_params(array('roleid' => 3, 'userid' => $USER->id));
}

/**
* Test \core_external\external_api::get_context()_from_params parameter validation.
*
* @covers \core_external\external_api::get_context
*/
public function test_get_context_params2() {
global $USER;

// Call without correct context details.
$this->expectException('invalid_parameter_exception');
$this->get_context_from_params(array('roleid' => 3, 'userid' => $USER->id, 'contextlevel' => "course"));
}

/**
* Test \core_external\external_api::get_context()_from_params parameter validation.
* @covers \core_external\external_api::get_context
*/
public function test_get_context_params3() {
global $USER;

// Call without correct context details.
$this->resetAfterTest(true);
$course = self::getDataGenerator()->create_course();
$this->expectException('invalid_parameter_exception');
$this->get_context_from_params(array('roleid' => 3, 'userid' => $USER->id, 'instanceid' => $course->id));
}

/**
* Data provider for the test_all_external_info test.
*
* @return array
*/
public function all_external_info_provider() {
global $DB;

// We are testing here that all the external function descriptions can be generated without
// producing warnings. E.g. misusing optional params will generate a debugging message which
// will fail this test.
$functions = $DB->get_records('external_functions', array(), 'name');
$return = array();
foreach ($functions as $f) {
$return[$f->name] = array($f);
}
return $return;
}

/**
* Test \core_external\external_api::external_function_info.
*
* @dataProvider all_external_info_provider
* @covers \core_external\external_api::external_function_info
*/
public function test_all_external_info($f) {
$desc = external_api::external_function_info($f);
$this->assertNotEmpty($desc->name);
$this->assertNotEmpty($desc->classname);
$this->assertNotEmpty($desc->methodname);
$this->assertEquals($desc->component, clean_param($desc->component, PARAM_COMPONENT));
$this->assertInstanceOf(\external_function_parameters::class, $desc->parameters_desc);
if ($desc->returns_desc != null) {
$this->assertInstanceOf(\external_description::class, $desc->returns_desc);
}
}

/**
* Test the \core_external\external_api::call_external_function() function.
*
* @covers \core_external\external_api::call_external_function
*/
public function test_call_external_function() {
global $PAGE, $COURSE, $CFG;

$this->resetAfterTest(true);

// Call some webservice functions and verify they are correctly handling $PAGE and $COURSE.
// First test a function that calls validate_context outside a course.
$this->setAdminUser();
$category = $this->getDataGenerator()->create_category();
$params = array(
'contextid' => \context_coursecat::instance($category->id)->id,
'name' => 'aaagrrryyy',
'idnumber' => '',
'description' => ''
);
$cohort1 = $this->getDataGenerator()->create_cohort($params);
$cohort2 = $this->getDataGenerator()->create_cohort();

$beforepage = $PAGE;
$beforecourse = $COURSE;
$params = array('cohortids' => array($cohort1->id, $cohort2->id));
$result = external_api::call_external_function('core_cohort_get_cohorts', $params);

$this->assertSame($beforepage, $PAGE);
$this->assertSame($beforecourse, $COURSE);

// Now test a function that calls validate_context inside a course.
$course = $this->getDataGenerator()->create_course();

$beforepage = $PAGE;
$beforecourse = $COURSE;
$params = array('courseid' => $course->id, 'options' => array());
$result = external_api::call_external_function('core_enrol_get_enrolled_users', $params);

$this->assertSame($beforepage, $PAGE);
$this->assertSame($beforecourse, $COURSE);

// Test a function that triggers a PHP exception.
require_once($CFG->dirroot . '/lib/tests/fixtures/test_external_function_throwable.php');

// Call our test function.
$result = \test_external_function_throwable::call_external_function('core_throw_exception', array(), false);

$this->assertTrue($result['error']);
$this->assertArrayHasKey('exception', $result);
$this->assertEquals($result['exception']->message, 'Exception - Modulo by zero');
}

protected function get_context_from_params() {
$rc = new \ReflectionClass(external_api::class);
$method = $rc->getMethod('get_context_from_params');
$method->setAccessible(true);
return $method->invokeArgs(null, func_get_args());
}
}

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