added method to case to get case provisions

tests/src/Unit/OCCaseTest.php

@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+
+namespace Drupal\Tests\opencase\Unit;
+
+use Drupal\Tests\UnitTestCase;
+
+class OCCaseTest extends UnitTestCase{
+
+    use EntityTrait;
+
+    private $case;
+
+    public function setUp(): void {
+        $this->etm = $this->getEntityTypeManager();
+        $this->getContainer([
+            'entity_type.manager' => $this->etm
+        ]);
+        $this->case = $this->getMockBuilder('\\Drupal\\opencase_cases\\Entity\\OCCase')->disableOriginalConstructor()
+            ->onlyMethods(['id'])
+            ->getMock();
+    }
+   
+    public function testGetCaseProvisionIds(): void{  
+        $storage = $this->getStorage($this->etm, 'oc_case_provision');
+        $query = $this->getQuery($storage); 
+        $this->case->expects($this->once())->method('id')->willReturn(5);        
+        $query->expects($this->once())->method('condition')->withConsecutive(
+            ['oc_case.target_id', 5]);
+        $query->expects($this->once())->method('execute')->willReturn([1,2,3,4]);
+        $ids = $this->case->getCaseProvisionIds($this->etm);
+        $this->assertTrue($ids == [1,2,3,4]);
+    }
+}