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diff --git a/www/wiki/tests/phpunit/includes/Storage/MutableRevisionSlotsTest.php b/www/wiki/tests/phpunit/includes/Storage/MutableRevisionSlotsTest.php
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+++ b/www/wiki/tests/phpunit/includes/Storage/MutableRevisionSlotsTest.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace MediaWiki\Tests\Storage;
+
+use MediaWiki\Storage\MutableRevisionSlots;
+use MediaWiki\Storage\RevisionAccessException;
+use MediaWiki\Storage\SlotRecord;
+use WikitextContent;
+
+/**
+ * @covers \MediaWiki\Storage\MutableRevisionSlots
+ */
+class MutableRevisionSlotsTest extends RevisionSlotsTest {
+
+	public function testSetMultipleSlots() {
+		$slots = new MutableRevisionSlots();
+
+		$this->assertSame( [], $slots->getSlots() );
+
+		$slotA = SlotRecord::newUnsaved( 'some', new WikitextContent( 'A' ) );
+		$slots->setSlot( $slotA );
+		$this->assertTrue( $slots->hasSlot( 'some' ) );
+		$this->assertSame( $slotA, $slots->getSlot( 'some' ) );
+		$this->assertSame( [ 'some' => $slotA ], $slots->getSlots() );
+
+		$slotB = SlotRecord::newUnsaved( 'other', new WikitextContent( 'B' ) );
+		$slots->setSlot( $slotB );
+		$this->assertTrue( $slots->hasSlot( 'other' ) );
+		$this->assertSame( $slotB, $slots->getSlot( 'other' ) );
+		$this->assertSame( [ 'some' => $slotA, 'other' => $slotB ], $slots->getSlots() );
+	}
+
+	public function testSetExistingSlotOverwritesSlot() {
+		$slots = new MutableRevisionSlots();
+
+		$this->assertSame( [], $slots->getSlots() );
+
+		$slotA = SlotRecord::newUnsaved( 'main', new WikitextContent( 'A' ) );
+		$slots->setSlot( $slotA );
+		$this->assertSame( $slotA, $slots->getSlot( 'main' ) );
+		$this->assertSame( [ 'main' => $slotA ], $slots->getSlots() );
+
+		$slotB = SlotRecord::newUnsaved( 'main', new WikitextContent( 'B' ) );
+		$slots->setSlot( $slotB );
+		$this->assertSame( $slotB, $slots->getSlot( 'main' ) );
+		$this->assertSame( [ 'main' => $slotB ], $slots->getSlots() );
+	}
+
+	public function testSetContentOfExistingSlotOverwritesContent() {
+		$slots = new MutableRevisionSlots();
+
+		$this->assertSame( [], $slots->getSlots() );
+
+		$slotA = SlotRecord::newUnsaved( 'main', new WikitextContent( 'A' ) );
+		$slots->setSlot( $slotA );
+		$this->assertSame( $slotA, $slots->getSlot( 'main' ) );
+		$this->assertSame( [ 'main' => $slotA ], $slots->getSlots() );
+
+		$newContent = new WikitextContent( 'B' );
+		$slots->setContent( 'main', $newContent );
+		$this->assertSame( $newContent, $slots->getContent( 'main' ) );
+	}
+
+	public function testRemoveExistingSlot() {
+		$slotA = SlotRecord::newUnsaved( 'main', new WikitextContent( 'A' ) );
+		$slots = new MutableRevisionSlots( [ $slotA ] );
+
+		$this->assertSame( [ 'main' => $slotA ], $slots->getSlots() );
+
+		$slots->removeSlot( 'main' );
+		$this->assertSame( [], $slots->getSlots() );
+		$this->setExpectedException( RevisionAccessException::class );
+		$slots->getSlot( 'main' );
+	}
+
+}