diff --git a/tests/unit/NaturallyColorModels/CyanMagentaYellowKeyTest.php b/tests/unit/NaturallyColorModels/CyanMagentaYellowKeyTest.php
index 5c2a8a5..73fec3b 100644
--- a/tests/unit/NaturallyColorModels/CyanMagentaYellowKeyTest.php
+++ b/tests/unit/NaturallyColorModels/CyanMagentaYellowKeyTest.php
@@ -125,4 +125,19 @@ class CyanMagentaYellowKeyTest extends AbstractColorModelUnit
         $this->expectException(InvalidArgumentException::class);
         $color->setKey($value);
     }
+
+    public function testGetPureColor(): void
+    {
+        $naturally_color = new CyanMagentaYellowKey();
+        $naturally_color
+            ->setCyan(12)
+            ->setMagenta(28)
+            ->setYellow(37)
+            ->setKey(56);
+        $pure_color = $naturally_color->getPureColor();
+        $this->assertEquals(0.12, $pure_color->getCyan());
+        $this->assertEquals(0.28, $pure_color->getMagenta());
+        $this->assertEquals(0.37, $pure_color->getYellow());
+        $this->assertEquals(0.56, $pure_color->getKey());
+    }
 }
diff --git a/tests/unit/NaturallyColorModels/HueSaturationValueTest.php b/tests/unit/NaturallyColorModels/HueSaturationValueTest.php
index 614e254..f76b4ec 100644
--- a/tests/unit/NaturallyColorModels/HueSaturationValueTest.php
+++ b/tests/unit/NaturallyColorModels/HueSaturationValueTest.php
@@ -97,4 +97,17 @@ class HueSaturationValueTest extends AbstractColorModelUnit
         $this->expectException(InvalidArgumentException::class);
         $color->setValue($value);
     }
+
+    public function testGetPureColor(): void
+    {
+        $naturally_color = new HueSaturationValue();
+        $naturally_color
+            ->setHue(45)
+            ->setSaturation(28)
+            ->setValue(56);
+        $pure_color = $naturally_color->getPureColor();
+        $this->assertEquals(0.125, $pure_color->getHue());
+        $this->assertEquals(0.28, $pure_color->getSaturation());
+        $this->assertEquals(0.56, $pure_color->getValue());
+    }
 }
diff --git a/tests/unit/NaturallyColorModels/RedGreenBlueTest.php b/tests/unit/NaturallyColorModels/RedGreenBlueTest.php
index f33cb1a..209acc9 100644
--- a/tests/unit/NaturallyColorModels/RedGreenBlueTest.php
+++ b/tests/unit/NaturallyColorModels/RedGreenBlueTest.php
@@ -106,4 +106,17 @@ class RedGreenBlueTest extends AbstractColorModelUnit
         $this->assertIsString($html);
         $this->assertEquals('#A1B2C3', $html);
     }
+
+    public function testGetPureColor(): void
+    {
+        $naturally_color = new RedGreenBlue();
+        $naturally_color
+            ->setRed(0x33)
+            ->setBlue(0x66)
+            ->setGreen(0x99);
+        $pure_color = $naturally_color->getPureColor();
+        $this->assertEquals(0.2, $pure_color->getRed());
+        $this->assertEquals(0.4, $pure_color->getBlue());
+        $this->assertEquals(0.6, $pure_color->getGreen());
+    }
 }