Add test to show #7180 has been fixed

tests/Doctrine/Tests/ORM/Functional/Ticket/GH7180Test.php

@@ -0,0 +1,217 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\GeneratedValue;
+use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\JoinColumn;
+use Doctrine\ORM\Mapping\ManyToOne;
+use Doctrine\ORM\Mapping\OneToOne;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+/**
+ * Tests suggested in https://github.com/doctrine/orm/pull/7180#issuecomment-380841413 and
+ * https://github.com/doctrine/orm/pull/7180#issuecomment-381067448.
+ *
+ * @group 7180
+ */
+final class GH7180Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([GH7180A::class, GH7180B::class, GH7180C::class, GH7180D::class, GH7180E::class, GH7180F::class, GH7180G::class]);
+    }
+
+    public function testIssue(): void
+    {
+        $a = new GH7180A();
+        $b = new GH7180B();
+        $c = new GH7180C();
+
+        $a->b = $b;
+        $b->a = $a;
+        $c->a = $a;
+
+        $this->_em->persist($a);
+        $this->_em->persist($b);
+        $this->_em->persist($c);
+
+        $this->_em->flush();
+
+        self::assertIsInt($a->id);
+        self::assertIsInt($b->id);
+        self::assertIsInt($c->id);
+    }
+
+    public function testIssue3NodeCycle(): void
+    {
+        $d = new GH7180D();
+        $e = new GH7180E();
+        $f = new GH7180F();
+        $g = new GH7180G();
+
+        $d->e = $e;
+        $e->f = $f;
+        $f->d = $d;
+        $g->d = $d;
+
+        $this->_em->persist($d);
+        $this->_em->persist($e);
+        $this->_em->persist($f);
+        $this->_em->persist($g);
+
+        $this->_em->flush();
+
+        self::assertIsInt($d->id);
+        self::assertIsInt($e->id);
+        self::assertIsInt($f->id);
+        self::assertIsInt($g->id);
+    }
+}
+
+/**
+ * @Entity
+ */
+class GH7180A
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=GH7180B::class, inversedBy="a")
+     * @JoinColumn(nullable=false)
+     * @var GH7180B
+     */
+    public $b;
+}
+
+/**
+ * @Entity
+ */
+class GH7180B
+{
+    /**
+     * @GeneratedValue()
+     * @Id
+     * @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=GH7180A::class, mappedBy="b")
+     * @JoinColumn(nullable=true)
+     * @var GH7180A
+     */
+    public $a;
+}
+
+/**
+ * @Entity
+ */
+class GH7180C
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @ManyToOne(targetEntity=GH7180A::class)
+     * @JoinColumn(nullable=false)
+     * @var GH7180A
+     */
+    public $a;
+}
+
+/**
+ * @Entity
+ */
+class GH7180D
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=GH7180E::class)
+     * @JoinColumn(nullable=false)
+     * @var GH7180E
+     */
+    public $e;
+}
+
+/**
+ * @Entity
+ */
+class GH7180E
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=GH7180F::class)
+     * @JoinColumn(nullable=false)
+     * @var GH7180F
+     */
+    public $f;
+}
+
+/**
+ * @Entity
+ */
+class GH7180F
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @ManyToOne(targetEntity=GH7180D::class)
+     * @JoinColumn(nullable=true)
+     * @var GH7180D
+     */
+    public $d;
+}
+
+/**
+ * @Entity
+ */
+class GH7180G
+{
+    /**
+     * @GeneratedValue()
+     * @Id @Column(type="integer")
+     * @var int
+     */
+    public $id;
+
+    /**
+     * @ManyToOne(targetEntity=GH7180D::class)
+     * @JoinColumn(nullable=false)
+     * @var GH7180D
+     */
+    public $d;
+}