add test case

composer.json

@@ -14,12 +14,27 @@
     "issues": "https://github.com/AxiosCros/php-tools/issues"
   },
   "require": {
-    "php": ">=7.2",
-    "symfony/var-dumper": "*"
+    "php": ">=7.2"
+  },
+  "require-dev": {
+    "symfony/var-dumper": "*",
+    "phpunit/phpunit": "^8.5"
   },
   "autoload": {
     "psr-4": {
       "axios\\tools\\": "src"
     }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "axios\\tools\\tests\\": "tests"
+    }
+  },
+  "scripts": {
+    "test": [
+      "@clearCache",
+      "./vendor/bin/phpunit --colors=always"
+    ],
+    "clearCache": "rm -rf cache/*"
   }
-}
+}

phpunit.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="./tests/bootstrap.php" colors="true" processIsolation="false" stopOnFailure="false"
+         convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true"
+         testSuiteLoaderFile="phpunit/src/Runner/StandardTestSuiteLoader.php">
+
+    <testsuites>
+        <testsuite name="All">
+            <directory>tests</directory>
+        </testsuite>
+        <testsuite name="Unit">
+            <directory suffix="Test.php">./tests/unit</directory>
+        </testsuite>
+    </testsuites>
+
+    <groups>
+        <exclude>
+            <group>integration</group>
+        </exclude>
+    </groups>
+
+    <logging>
+        <log type="coverage-html" target="cache/coverage" lowUpperBound="35" highLowerBound="70"/>
+        <log type="coverage-clover" target="cache/coverage.clover"/>
+    </logging>
+
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./src</directory>
+        </whitelist>
+    </filter>
+</phpunit>

tests/bootstrap.php

@@ -0,0 +1,5 @@
+<?php
+
+declare(strict_types=1);
+
+require dirname(__DIR__) . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';

tests/unit/ListTreeTest.php

@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+namespace axios\tools\tests\unit;
+
+use axios\tools\ListToTree;
+use axios\tools\TreeToList;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @internal
+ * @coversNothing
+ */
+class ListTreeTest extends TestCase
+{
+    public function testListToTree()
+    {
+        $data       = [
+            ['id' => 1, 'parent_id' => 0],
+            ['id' => 2, 'parent_id' => 3],
+            ['id' => 3, 'parent_id' => 1],
+            ['id' => 4, 'parent_id' => 2],
+            ['id' => 5, 'parent_id' => 6],
+            ['id' => 6, 'parent_id' => 7],
+            ['id' => 7, 'parent_id' => 5],
+        ];
+        $ListToTree = new ListToTree($data);
+        $this->assertEquals([
+            [
+                'id'        => 1,
+                'parent_id' => 0,
+                'child'     => [
+                    0 => [
+                        'id'        => 3,
+                        'parent_id' => 1,
+                        'child'     => [
+                            0 => [
+                                'id'        => 2,
+                                'parent_id' => 3,
+                                'child'     => [
+                                    0 => [
+                                        'id'        => 4,
+                                        'parent_id' => 2,
+                                    ],
+                                ],
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ], $ListToTree->toTree());
+    }
+
+    public function testTreeToList()
+    {
+        $data       = [
+            [
+                'id'        => 1,
+                'parent_id' => 0,
+                'child'     => [
+                    0 => [
+                        'id'        => 3,
+                        'parent_id' => 1,
+                        'child'     => [
+                            0 => [
+                                'id'        => 2,
+                                'parent_id' => 3,
+                                'child'     => [
+                                    0 => [
+                                        'id'        => 4,
+                                        'parent_id' => 2,
+                                    ],
+                                ],
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ];
+        $TreeToList = new TreeToList($data);
+        $this->assertEquals([
+            ['id' => 1, 'parent_id' => 0],
+            ['id' => 2, 'parent_id' => 1],
+            ['id' => 3, 'parent_id' => 2],
+            ['id' => 4, 'parent_id' => 3],
+        ], $TreeToList->toList());
+    }
+}