first commit

tests/TestCase.php

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+<?php
+
+namespace Tests;
+
+use CI_Controller;
+use EA_Controller;
+use PHPUnit\Framework\TestCase as PHPUnitTestCase;
+
+/**
+ * Parent test case sharing common test functionality.
+ */
+class TestCase extends PHPUnitTestCase {
+    /**
+     * @var EA_Controller|CI_Controller
+     */
+    private static EA_Controller|CI_Controller $CI;
+
+    /**
+     * Load the framework instance.
+     *
+     * @return void
+     */
+    public static function setUpBeforeClass(): void
+    {
+        self::$CI =& get_instance();
+    }
+}

tests/Unit/Helper/ArrayHelperTest.php

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+<?php
+
+namespace Tests\Unit\Helper;
+
+use Tests\TestCase;
+
+class ArrayHelperTest extends TestCase {
+    public function testIsAssocReturnsTrueOnAssociativeArray(): void
+    {
+        $this->assertTrue(is_assoc(['test' => 'value']));
+    }
+
+    public function testIsAssocReturnsFalseOnIndexedArray(): void
+    {
+        $this->assertFalse(is_assoc(['one', 'two', 'three']));
+    }
+
+    public function testIsAssocReturnsTrueOnMixedArray(): void
+    {
+        $this->assertTrue(is_assoc(['one', 'two', 'three' => 'value']));
+    }
+
+    public function testArrayFindReturnsCorrectElement(): void
+    {
+        $arr = [
+            [
+                'id' => 1
+            ],
+            [
+                'id' => 2
+            ],
+            [
+                'id' => 3
+            ],
+        ];
+
+        $this->assertSame($arr[0], array_find($arr, fn($element) => $element['id'] === 1));
+    }
+
+    public function testArrayFieldsReturnsStrippedArray(): void
+    {
+        $arr = [
+            'name' => 'John',
+            'email' => 'john@example.org',
+        ];
+
+        $stripped = array_fields($arr, ['name']);
+
+        $this->assertArrayHasKey('name', $stripped);
+
+        $this->assertArrayNotHasKey('email', $stripped);
+    }
+}

tests/Unit/Helper/ValidationHelperTest.php

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+<?php
+
+namespace Tests\Unit\Helper;
+
+use Tests\TestCase;
+
+class ValidationHelperTest extends TestCase {
+    public function testValidateDateTimeReturnsTrueOnValidValue()
+    {
+        $this->assertTrue(validate_datetime(date('Y-m-d H:i:s')));
+    }
+
+    public function testValidateDateTimeReturnsFalseOnInvalidValue()
+    {
+        $this->assertFalse(validate_datetime('invalid'));
+    }
+}