diff --git a/tests/GuardTest.php b/tests/GuardTest.php
index 42c97ec..3de9b7d 100644
--- a/tests/GuardTest.php
+++ b/tests/GuardTest.php
@@ -12,24 +12,43 @@ use PHPUnit\Framework\Attributes\CoversClass;
 #[CoversClass(Guard::class)]
 class GuardTest extends TestCase
 {
-    public function testargumentIsValidIndex(): void
+    public function testargumentIsValidIndexArgumentAbove(): void
     {
         $this->expectException(Exception::class);
         $this->expectExceptionMessage('dummy is an invalid index');
         Guard::argumentIsValidIndex(10, 10, "dummy");
     }
 
-    public function testargumentIsValidIndex2(): void
+    public function testargumentIsValidIndexArgumentBelow(): void
     {
         $this->expectException(Exception::class);
         $this->expectExceptionMessage('dummy is an invalid index');
         Guard::argumentIsValidIndex(-1, 10, "dummy");
     }
 
-    public function testargumentInRangeInclusive(): void
+    public function testargumentIsValidIndexArgumentValid(): void
+    {
+        Guard::argumentIsValidIndex(5, 10, "dummy");
+        $this->expectNotToPerformAssertions();
+    }
+
+    public function testargumentInRangeInclusiveAbove(): void
     {
         $this->expectException(Exception::class);
         $this->expectExceptionMessage('dummy is not in the valid range [0, 100]');
         Guard::argumentInRangeInclusive(101, 0, 100, "dummy");
     }
+
+    public function testargumentInRangeInclusiveBelow(): void
+    {
+        $this->expectException(Exception::class);
+        $this->expectExceptionMessage('dummy is not in the valid range [0, 100]');
+        Guard::argumentInRangeInclusive(-1, 0, 100, "dummy");
+    }
+
+    public function testargumentInRangeInclusiveValid(): void
+    {
+        Guard::argumentInRangeInclusive(50, 0, 100, "dummy");
+        $this->expectNotToPerformAssertions();
+    }
 }
diff --git a/tests/PartialPlayTest.php b/tests/PartialPlayTest.php
new file mode 100644
index 0000000..c5925cc
--- /dev/null
+++ b/tests/PartialPlayTest.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DNW\Skills\Tests;
+
+use DNW\Skills\PartialPlay;
+use DNW\Skills\Player;
+use DNW\Skills\Guard;
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+
+#[CoversClass(PartialPlay::class)]
+#[UsesClass(Player::class)]
+#[UsesClass(Guard::class)]
+class PartialPlayTest extends TestCase
+{
+    public function testgetPartialPlayPercentage(): void
+    {
+        $p = new Player(1, 0.5);
+        $this->assertEquals($p->getPartialPlayPercentage(), PartialPlay::getPartialPlayPercentage($p));
+
+        $p = new Player(1, 0.000000);
+        $this->assertNotEquals(0.0, PartialPlay::getPartialPlayPercentage($p));
+    }
+}