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system/Test/Mock/MockLanguage.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Test\Mock;
+
+use CodeIgniter\Language\Language;
+
+class MockLanguage extends Language
+{
+    /**
+     * Stores the data that should be
+     * returned by the 'requireFile()' method.
+     *
+     * @var mixed
+     */
+    protected $data;
+
+    /**
+     * Sets the data that should be returned by the
+     * 'requireFile()' method to allow easy overrides
+     * during testing.
+     *
+     * @return $this
+     */
+    public function setData(string $file, array $data, ?string $locale = null)
+    {
+        $this->language[$locale ?? $this->locale][$file] = $data;
+
+        return $this;
+    }
+
+    /**
+     * Provides an override that allows us to set custom
+     * data to be returned easily during testing.
+     */
+    protected function requireFile(string $path): array
+    {
+        return $this->data ?? [];
+    }
+
+    /**
+     * Arbitrarily turnoff internationalization support for testing
+     */
+    public function disableIntlSupport()
+    {
+        $this->intlSupport = false;
+    }
+}