[11.8] Add support for GroupEpics::issues() (#706)

* add list epic issues endpoint

* fix style

Author: macbookandrew

src/Api/GroupsEpics.php

@@ -103,4 +103,15 @@ public function remove($group_id, int $epic_id)
     {
         return $this->delete('groups/'.self::encodePath($group_id).'/epics/'.self::encodePath($epic_id));
     }
+
+    /**
+     * @param int|string $group_id
+     * @param int        $epic_iid
+     *
+     * @return mixed
+     */
+    public function issues($group_id, int $epic_iid)
+    {
+        return $this->get('groups/'.self::encodePath($group_id).'/epics/'.self::encodePath($epic_iid).'/issues');
+    }
 }

tests/Api/GroupsEpicsTest.php

@@ -106,6 +106,26 @@ public function shouldRemoveEpic(): void
         $this->assertEquals($expectedBool, $api->remove(1, 2));
     }
 
+    /**
+     * @test
+     */
+    public function shouldGetEpicsIssues(): void
+    {
+        $expectedArray = [
+            ['id' => 1, 'title' => 'An issue'],
+            ['id' => 2, 'title' => 'Another issue'],
+        ];
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('groups/1/epics/2/issues')
+            ->will($this->returnValue($expectedArray))
+        ;
+
+        $this->assertEquals($expectedArray, $api->issues(1, 2));
+    }
+
     protected function getApiClass()
     {
         return GroupsEpics::class;