chore: add unit tests for form modifier

test/unit/models/classes/form/Modifier/UniqueIdFormModifierTest.php

@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * This program 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; under version 2
+ * of the License (non-upgradable).
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (c) 2024 (original work) Open Assessment Technologies SA.
+ */
+
+declare(strict_types=1);
+
+namespace oat\tao\test\unit\models\classes\form\Modifier;
+
+use oat\tao\model\featureFlag\FeatureFlagCheckerInterface;
+use oat\tao\model\form\Modifier\UniqueIdFormModifier;
+use oat\tao\model\TaoOntology;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use tao_helpers_form_Form;
+use tao_helpers_Uri;
+
+class UniqueIdFormModifierTest extends TestCase
+{
+    /** @var FeatureFlagCheckerInterface|MockObject */
+    private $featureFlagChecker;
+
+    private UniqueIdFormModifier $sut;
+
+    protected function setUp(): void
+    {
+        $this->featureFlagChecker = $this->createMock(FeatureFlagCheckerInterface::class);
+        $this->sut = new UniqueIdFormModifier($this->featureFlagChecker);
+    }
+
+    public function testFeatureEnabled(): void
+    {
+        $this->featureFlagChecker
+            ->expects($this->once())
+            ->method('isEnabled')
+            ->willReturn(true);
+
+        $form = $this->createMock(tao_helpers_form_Form::class);
+
+        $form
+            ->expects($this->never())
+            ->method('removeElement');
+
+        $this->sut->modify($form);
+    }
+
+    public function testFeatureDisabled(): void
+    {
+        $this->featureFlagChecker
+            ->expects($this->once())
+            ->method('isEnabled')
+            ->willReturn(false);
+
+        $form = $this->createMock(tao_helpers_form_Form::class);
+
+        $form
+            ->expects($this->once())
+            ->method('removeElement')
+            ->with(tao_helpers_Uri::encode(TaoOntology::PROPERTY_UNIQUE_IDENTIFIER));
+
+        $this->sut->modify($form);
+    }
+}