Merge pull request #1 from xepozz/support-internal-functions

Support internal functions mock
xepozz · Dec 22, 2023 · 47b197b · 47b197b
2 parents 41aea59 + cc5d0b5
commit 47b197b
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diff --git a/README.md b/README.md
@@ -1,7 +1,7 @@
 # Introduction
 
-The package helps mock internal php functions as simple as it can. You can use this package when you need mock such
-functions as: `time()`, `str_contains()` and etc.
+The package helps mock internal php functions as simple as possible. Use this package when you need mock such
+functions as: `time()`, `str_contains()`, `rand`, etc.
 
 ## Installation
 
@@ -11,9 +11,9 @@ composer require xepozz/internal-mocker --dev
 
 ## Usage
 
-The main idea is simple: register Listener of PHPUnit and call Mocker at first.
+The main idea is pretty simple: register a Listener for PHPUnit and call the Mocker extension first.
 
-### Register hook
+### Register a hook
 
 1. Create new file `tests/MockerExtension.php`
 2. Paste the following code into the created file:
@@ -58,15 +58,15 @@ Here you have registered extension that will be called every time when you run `
 
 The package supports a few ways to mock functions:
 
-1. Runtime mock
-2. Pre-defined mock
+1. Runtime mocks
+2. Pre-defined mocks
 3. Mix of two previous ways
 
-#### Runtime mock
+#### Runtime mocks
 
 If you want to make your test case to be used with mocked function you should register it before.
 
-Back to the created `MockerExtension::executeBeforeFirstTest` and edit the `$mocks` var.
+Back to the created `MockerExtension::executeBeforeFirstTest` and edit the `$mocks` variable.
 
 ```php
 $mocks = [
@@ -83,10 +83,10 @@ When you want to mock result in tests you should write the following code into n
 
 ```php
 MockerState::addCondition(
-   'App\Service',
-   'time',
-   [],
-   100
+   'App\Service', // namespace
+   'time', // function name
+   [], // arguments
+   100 // result
 );
 ```
 
@@ -127,9 +127,9 @@ Pre-defined mocks allow you to mock behaviour globally.
 It means that you don't need to write `MockerState::addCondition(...)` into each test case if you want to mock it for
 whole project.
 
-> Keep in the mind that the same function in different namespaces is not the same for `Mocker`.
+> Keep in mind that the same functions from different namespaces are not the same for `Mocker`.
 
-So back to the created `MockerExtension::executeBeforeFirstTest` and edit the `$mocks` var.
+So back to the created `MockerExtension::executeBeforeFirstTest` and edit the `$mocks` variable.
 
 ```php
 $mocks = [
@@ -162,63 +162,49 @@ These methods save "current" state and unload each `Runtime mock` mock that was
 
 Using `MockerState::saveState()` after `Mocker->load($mocks)` saves only **_Pre-defined_** mocks.
 
-## Restrictions
+## Global namespaced functions
 
-You should use function without using root namespace aliasing.
+### Internal functions
 
-#### Good example
+Without any additional configuration you can mock only functions that are defined under any not global
+namespaces: `App\`, `App\Service\`, etc.
+But you cannot mock functions that are defined under global namespace or defined in a `use` statement, e.g. `use time;`
+or `\time();`.
 
-```php
-namespace App\Service
+#### Workaround
 
-class SomeService
-{
-    public function doSomething()
-    {
-        // ...
-        time()
-        // ...
-    }
-}
-```
+The way you can mock global functions is to disable them
+in `php.ini`: https://www.php.net/manual/en/ini.core.php#ini.disable-functions
 
-#### Bad examples
+The best way is to disable them only for tests by running a command with the additional flags:
 
-Make sure that function doesn't have leading backslash.
+```bash
+php -ddisable_functions=${functions} ./vendor/bin/phpunit
+```
 
-```php
-namespace App\Service
+> Replace `${functions}` with the list of functions that you want to mock, separated by commas, e.g.: `time,rand`.
 
-class SomeService
-{
-    public function doSomething()
-    {
-        // ...
-        \time()
-        // ...
-    }
-}
-```
+So now you can mock global functions as well.
 
-Make sure that function isn't included into `use` section.
+#### Internal function implementation
 
-```php
-namespace App\Service
+When you disable a function in `php.ini` you cannot call it anymore. That means you must implement it by yourself.
 
-use function time;
+Obviously, almost all functions are implemented in PHP looks the same as the Bash ones.
 
-class SomeService
-{
-    public function doSomething()
-    {
-        // ...
-        time()
-        // ...
-    }
-}
+The shortest way to implement a function is to use ``` `bash command` ``` syntax:
+
+```php
+$mocks[] = [
+   'namespace' => '',
+   'name' => 'time',
+   'function' => fn () => `date +%s`,
+];
 ```
 
-##### Data Providers
+## Restrictions
+
+### Data Providers
 
 Sometimes you may face unpleasant situation when mocked function is not mocking without forced using `namespace`
 + `function`.
@@ -265,5 +251,6 @@ final class MockerExtension implements BeforeTestHook, BeforeFirstTestHook
 ```
 
 That all because of PHPUnit 9.5 and lower event management system.
-Data Provider functionality starts to work before any events so it's impossible to mock the function at the beginning of
+Data Provider functionality starts to work before any events, so it's impossible to mock the function at the beginning
+of
 the runtime.  
diff --git a/composer.json b/composer.json
@@ -1,26 +1,26 @@
 {
     "name": "xepozz/internal-mocker",
     "type": "library",
-    "autoload": {
-        "psr-4": {
-            "Xepozz\\InternalMocker\\": "src/"
-        }
-    },
-    "autoload-dev": {
-        "psr-4": {
-            "Xepozz\\InternalMocker\\Tests\\": "tests/"
-        }
-    },
     "authors": [
         {
             "name": "Dmitrii Derepko",
             "email": "[email protected]"
         }
     ],
+    "require": {
+        "yiisoft/var-dumper": "^1.2"
+    },
     "require-dev": {
         "phpunit/phpunit": "^9.5"
     },
-    "require": {
-        "yiisoft/var-dumper": "^1.2"
+    "autoload": {
+        "psr-4": {
+            "Xepozz\\InternalMocker\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Xepozz\\InternalMocker\\Tests\\": "tests/"
+        }
     }
 }
diff --git a/src/Mocker.php b/src/Mocker.php
@@ -30,7 +30,7 @@ public function load(array $mocks): void
     public function generate(array $mocks): string
     {
         $mocks = $this->normalizeMocks($mocks);
-        $mockerConfig = ['namespace ' . __NAMESPACE__ . ';'];
+        $mockerConfig = [];
         foreach ($mocks as $namespace => $functions) {
             foreach ($functions as $functionName => $imocks) {
                 foreach ($imocks as $imock) {
@@ -41,39 +41,52 @@ public function generate(array $mocks): string
                     $resultString = VarDumper::create($imock['result'])->export(false);
                     $defaultString = $imock['default'] ? 'true' : 'false';
                     $mockerConfig[] = <<<PHP
-MockerState::addCondition(
-    "$namespace", 
-    "$functionName",
-    $argumentsString,
-    $resultString,
-    $defaultString,
-);
-PHP;
+                    MockerState::addCondition(
+                        "$namespace", 
+                        "$functionName",
+                        $argumentsString,
+                        $resultString,
+                        $defaultString,
+                    );
+                    PHP;
                 }
             }
         }
         $outputs = [];
+        $mockerConfigClassName = MockerState::class;
         foreach ($mocks as $namespace => $functions) {
             $innerOutputsString = $this->generateFunction($functions);
 
-            $mockerConfigClassName = MockerState::class;
-
             $outputs[] = <<<PHP
-namespace {$namespace};
+            namespace {$namespace} {
+            use {$mockerConfigClassName};
+            
+            $innerOutputsString
+            }
+            PHP;
+        }
 
-use $mockerConfigClassName;
 
-$innerOutputsString
-PHP;
+        $pre = '';
+        if ($mockerConfig !== []) {
+            $runtimeMocks = implode("\n", $mockerConfig);
+            $pre = <<<PHP
+            namespace {
+            use {$mockerConfigClassName};
+            
+            {$runtimeMocks}
+            }
+            PHP;
         }
 
 
-        return implode("\n", $mockerConfig) . "\n\n\n" . implode("\n", $outputs);
+        return $pre . "\n\n\n" . implode("\n", $outputs);
     }
 
     private function normalizeMocks(array $mocks): array
     {
         $result = [];
+        usort($mocks, fn ($a, $b) => strlen($a['namespace']) <=> strlen($b['namespace']));
         foreach ($mocks as $mock) {
             $result[$mock['namespace']][$mock['name']][] = [
                 'namespace' => $mock['namespace'],
@@ -82,6 +95,7 @@ private function normalizeMocks(array $mocks): array
                 'arguments' => $mock['arguments'] ?? [],
                 'skip' => !array_key_exists('result', $mock),
                 'default' => $mock['default'] ?? false,
+                'function' => $mock['function'] ?? false,
             ];
         }
         return $result;
@@ -91,13 +105,20 @@ private function generateFunction(mixed $groupedMocks): string
     {
         $innerOutputs = [];
         foreach ($groupedMocks as $functionName => $_) {
+            $function = "fn() => \\$functionName(...\$arguments)";
+            if ($_[0]['function'] !== false) {
+                $function = is_string($_[0]['function']) ? $_[0]['function'] : VarDumper::create(
+                    $_[0]['function']
+                )->export(false);
+            }
+
             $string = <<<PHP
             function $functionName(...\$arguments)
             {
                 if (MockerState::checkCondition(__NAMESPACE__, "$functionName", \$arguments)) {
                     return MockerState::getResult(__NAMESPACE__, "$functionName", \$arguments);
                 }
-                return MockerState::getDefaultResult(__NAMESPACE__, "$functionName", fn() => \\$functionName(...\$arguments));
+                return MockerState::getDefaultResult(__NAMESPACE__, "$functionName", $function);
             }
             PHP;
             $innerOutputs[] = $string;

diff --git a/tests/Integration/TimeTest.php b/tests/Integration/TimeTest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Xepozz\InternalMocker\Tests\Integration;
+
+use PHPUnit\Framework\TestCase;
+use Xepozz\InternalMocker\MockerState;
+
+use function time;
+
+final class TimeTest extends TestCase
+{
+    public function testRun()
+    {
+        $this->assertEquals(`date +%s`, time());
+    }
+
+    public function testRun2()
+    {
+        MockerState::addCondition(
+            '',
+            'time',
+            [],
+            100
+        );
+
+        $this->assertEquals(100, time());
+    }
+
+    public function testRun3()
+    {
+        $this->assertEquals(`date +%s`, time());
+    }
+
+    public function testRun4()
+    {
+        $now = time();
+        sleep(1);
+        $next = time();
+
+        $this->assertEquals(1, $next - $now);
+    }
+}
diff --git a/tests/MockerExtension.php b/tests/MockerExtension.php
@@ -69,6 +69,11 @@ public static function load(): void
                 'namespace' => 'ASD',
                 'name' => 'only_runtime',
             ],
+            [
+                'namespace' => '',
+                'name' => 'time',
+                'function' => fn () => `date +%s`,
+            ],
         ];
 
         $mocker = new Mocker();