diff --git a/exercises/practice/knapsack/KnapsackTest.php b/exercises/practice/knapsack/KnapsackTest.php
index 1abe41afd..f48872730 100644
--- a/exercises/practice/knapsack/KnapsackTest.php
+++ b/exercises/practice/knapsack/KnapsackTest.php
@@ -20,105 +20,155 @@ protected function setUp(): void
 
     /**
      * uuid: 3993a824-c20e-493d-b3c9-ee8a7753ee59
+     * @testdox No Items
      */
     public function testNoItems(): void
     {
-        $this->assertEquals(0, $this->knapsack->getMaximumValue(100, []));
+        $expected = 0;
+        $maximumWeight = 100;
+        $items = [];
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: 1d39e98c-6249-4a8b-912f-87cb12e506b0
+     * @testdox One item, too heavy
      */
     public function testOneItemTooHeavy(): void
     {
-        $items = [[ 'weight' => 100, 'value' => 1 ]];
-        $this->assertEquals(0, $this->knapsack->getMaximumValue(10, $items));
+        $expected = 0;
+        $maximumWeight = 10;
+        $items = [['weight' => 100, 'value' => 1]];
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: 833ea310-6323-44f2-9d27-a278740ffbd8
+     * @testdox Five items (cannot be greedy by weight)
      */
     public function testFiveItemsCannotBeGreedyByWeight(): void
     {
+        $expected = 21;
+        $maximumWeight = 10;
         $items = [
-            [ 'weight' => 2, 'value' => 5 ],
-            [ 'weight' => 2, 'value' => 5 ],
-            [ 'weight' => 2, 'value' => 5 ],
-            [ 'weight' => 2, 'value' => 5 ],
-            [ 'weight' => 10, 'value' => 21 ],
+            ['weight' => 2, 'value' => 5],
+            ['weight' => 2, 'value' => 5],
+            ['weight' => 2, 'value' => 5],
+            ['weight' => 2, 'value' => 5],
+            ['weight' => 10, 'value' => 21],
         ];
-        $this->assertEquals(21, $this->knapsack->getMaximumValue(10, $items));
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: 277cdc52-f835-4c7d-872b-bff17bab2456
+     * @testdox Five items (cannot be greedy by value)
      */
     public function testFiveItemsCannotBeGreedyByValue(): void
     {
+        $expected = 80;
+        $maximumWeight = 10;
         $items = [
-            [ 'weight' => 2, 'value' => 20 ],
-            [ 'weight' => 2, 'value' => 20 ],
-            [ 'weight' => 2, 'value' => 20 ],
-            [ 'weight' => 2, 'value' => 20 ],
-            [ 'weight' => 10, 'value' => 50 ],
+            ['weight' => 2, 'value' => 20],
+            ['weight' => 2, 'value' => 20],
+            ['weight' => 2, 'value' => 20],
+            ['weight' => 2, 'value' => 20],
+            ['weight' => 10, 'value' => 50],
         ];
-        $this->assertEquals(80, $this->knapsack->getMaximumValue(10, $items));
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: 81d8e679-442b-4f7a-8a59-7278083916c9
+     * @testdox Example knapsack
      */
     public function testExampleKnapsack(): void
     {
+        $expected = 90;
+        $maximumWeight = 10;
         $items = [
-            [ 'weight' => 5, 'value' => 10 ],
-            [ 'weight' => 4, 'value' => 40 ],
-            [ 'weight' => 6, 'value' => 30 ],
-            [ 'weight' => 4, 'value' => 50 ],
+            ['weight' => 5, 'value' => 10],
+            ['weight' => 4, 'value' => 40],
+            ['weight' => 6, 'value' => 30],
+            ['weight' => 4, 'value' => 50],
         ];
-        $this->assertEquals(90, $this->knapsack->getMaximumValue(10, $items));
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: f23a2449-d67c-4c26-bf3e-cde020f27ecc
+     * @testdox 8 items
      */
     public function testEightItems(): void
     {
+        $expected = 900;
+        $maximumWeight = 104;
         $items = [
-            [ 'weight' => 25, 'value' => 350 ],
-            [ 'weight' => 35, 'value' => 400 ],
-            [ 'weight' => 45, 'value' => 450 ],
-            [ 'weight' => 5, 'value' => 20 ],
-            [ 'weight' => 25, 'value' => 70 ],
-            [ 'weight' => 3, 'value' => 8 ],
-            [ 'weight' => 2, 'value' => 5 ],
-            [ 'weight' => 2, 'value' => 5 ],
+            ['weight' => 25, 'value' => 350],
+            ['weight' => 35, 'value' => 400],
+            ['weight' => 45, 'value' => 450],
+            ['weight' => 5, 'value' => 20],
+            ['weight' => 25, 'value' => 70],
+            ['weight' => 3, 'value' => 8],
+            ['weight' => 2, 'value' => 5],
+            ['weight' => 2, 'value' => 5],
         ];
-        $this->assertEquals(900, $this->knapsack->getMaximumValue(104, $items));
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 
     /**
      * uuid: 7c682ae9-c385-4241-a197-d2fa02c81a11
+     * @testdox 15 items
      */
     public function testFifteenItems(): void
     {
+        $expected = 1458;
+        $maximumWeight = 750;
         $items = [
-            [ 'weight' => 70, 'value' => 135 ],
-            [ 'weight' => 73, 'value' => 139 ],
-            [ 'weight' => 77, 'value' => 149 ],
-            [ 'weight' => 80, 'value' => 150 ],
-            [ 'weight' => 82, 'value' => 156 ],
-            [ 'weight' => 87, 'value' => 163 ],
-            [ 'weight' => 90, 'value' => 173 ],
-            [ 'weight' => 94, 'value' => 184 ],
-            [ 'weight' => 98, 'value' => 192 ],
-            [ 'weight' => 106, 'value' => 201 ],
-            [ 'weight' => 110, 'value' => 210 ],
-            [ 'weight' => 113, 'value' => 214 ],
-            [ 'weight' => 115, 'value' => 221 ],
-            [ 'weight' => 118, 'value' => 229 ],
-            [ 'weight' => 120, 'value' => 240 ],
+            ['weight' => 70, 'value' => 135],
+            ['weight' => 73, 'value' => 139],
+            ['weight' => 77, 'value' => 149],
+            ['weight' => 80, 'value' => 150],
+            ['weight' => 82, 'value' => 156],
+            ['weight' => 87, 'value' => 163],
+            ['weight' => 90, 'value' => 173],
+            ['weight' => 94, 'value' => 184],
+            ['weight' => 98, 'value' => 192],
+            ['weight' => 106, 'value' => 201],
+            ['weight' => 110, 'value' => 210],
+            ['weight' => 113, 'value' => 214],
+            ['weight' => 115, 'value' => 221],
+            ['weight' => 118, 'value' => 229],
+            ['weight' => 120, 'value' => 240],
         ];
-        $this->assertEquals(1458, $this->knapsack->getMaximumValue(750, $items));
+
+        $knapsack = new Knapsack();
+        $actual = $knapsack->getMaximumValue($maximumWeight, $items);
+
+        $this->assertEquals($expected, $actual);
     }
 }