diff --git a/tests/phpunit/unit/STVTallierTest.php b/tests/phpunit/unit/STVTallierTest.php
index 6730e5a..0822a5e 100644
--- a/tests/phpunit/unit/STVTallierTest.php
+++ b/tests/phpunit/unit/STVTallierTest.php
@@ -100,6 +100,99 @@ class STVTallierTest extends MediaWikiUnitTestCase {
 		];
 	}
 
+	public static function testDeclareEliminatedProvider() {
+		return [
+			[
+				// Example from 12_9_4828_204236991
+				[
+					1 => ['total' => 482],
+					2 => ['total' => 205.00000000000304],
+					3 => ['total' => 205],
+				],
+				0,
+				[],
+				[3],
+			],
+			[
+				// Example from 12_9_4828_204236991
+				[
+					1 => ['total' => 482],
+					2 => ['total' => 205.00000000000304],
+					3 => ['total' => 205],
+				],
+				1,
+				[],
+				[],
+			],
+			[
+				// Example from 12_9_5000_1830523430
+				[
+					1 => ['total' => 500.000001],
+					2 => ['total' => 248.0],
+					3 => ['total' => 248],
+				],
+				0,
+				[],
+				[2, 3],
+			],
+			[
+				// Example from 12_9_5000_1830523430
+				[
+					1 => ['total' => 500.000001],
+					2 => ['total' => 248.0],
+					3 => ['total' => 248],
+				],
+				1,
+				[],
+				[2, 3],
+			],
+			[
+				// Example from 12_9_5000_1830523430
+				[
+					1 => ['total' => 500.000001],
+					2 => ['total' => 248],
+					3 => ['total' => 248.0],
+				],
+				0,
+				[],
+				[2, 3],
+			],
+			[
+				// Example from 12_9_5000_1830523430
+				[
+					1 => ['total' => 500.000001],
+					2 => ['total' => 248],
+					3 => ['total' => 248.0],
+				],
+				1,
+				[],
+				[2, 3],
+			],
+			[
+				// Example from 12_9_4808_1919647607
+				[
+					1 => ['total' => 480],
+					2 => ['total' => 200.00000000000699],
+					3 => ['total' => 200],
+				],
+				0,
+				[],
+				[3],
+			],
+			[
+				// Example from 12_9_4808_1919647607
+				[
+					1 => ['total' => 480],
+					2 => ['total' => 200.00000000000699],
+					3 => ['total' => 200],
+				],
+				1,
+				[],
+				[],
+			],
+		];
+	}
+
 	public function testFactory() {
 		$this->assertInstanceOf( STVTallier::class, $this->tallier );
 	}
@@ -148,4 +241,13 @@ class STVTallierTest extends MediaWikiUnitTestCase {
 		$expectedRounds = count( $expected[ 'rounds'] );
 		$this->assertCount( $expectedRounds, $this->tallier->resultsLog['rounds'] );
 	}
+
+	/**
+	 * @dataProvider testDeclareEliminatedProvider
+	 * @covers \MediaWiki\Extensions\SecurePoll\Talliers\STVTallier::declareEliminated
+	 */
+	public function testDeclareEliminated( $ranking, $surplus, $eliminated, $expected ) {
+		$actual = TestingAccessWrapper::newFromObject( $this->tallier )->declareEliminated( $ranking, $surplus, $eliminated );
+		$this->assertSame( $expected, $actual );
+	}
 }