diff --git a/src/Common/Annotations.php b/src/Common/Annotations.php
index 8cbd2f85..3dc87dd9 100644
--- a/src/Common/Annotations.php
+++ b/src/Common/Annotations.php
@@ -173,6 +173,8 @@ public function code(bool $code = true): self
 
     public function withColor(string $color): self
     {
+        $this->checkColor($color);
+
         return new self(
             $this->bold,
             $this->italic,
diff --git a/tests/Unit/Common/AnnotationsTest.php b/tests/Unit/Common/AnnotationsTest.php
new file mode 100644
index 00000000..4c8d0396
--- /dev/null
+++ b/tests/Unit/Common/AnnotationsTest.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace Notion\Test\Common;
+
+use Notion\Common\Annotations;
+use PHPUnit\Framework\TestCase;
+
+class AnnotationsTest extends TestCase
+{
+    public function test_without_annotations(): void
+    {
+        $annotations = Annotations::create();
+
+        $this->assertFalse($annotations->isBold());
+        $this->assertFalse($annotations->isItalic());
+        $this->assertFalse($annotations->isStrikeThrough());
+        $this->assertFalse($annotations->isUnderline());
+        $this->assertFalse($annotations->isCode());
+        $this->assertEquals("default", $annotations->color());
+    }
+
+    public function test_bold(): void
+    {
+        $annotations = Annotations::create()->bold();
+
+        $this->assertTrue($annotations->isBold());
+    }
+
+    public function test_italic(): void
+    {
+        $annotations = Annotations::create()->italic();
+
+        $this->assertTrue($annotations->isItalic());
+    }
+
+    public function test_strike_through(): void
+    {
+        $annotations = Annotations::create()->strikeThrough();
+
+        $this->assertTrue($annotations->isStrikeThrough());
+    }
+
+    public function test_underline(): void
+    {
+        $annotations = Annotations::create()->underline();
+
+        $this->assertTrue($annotations->isUnderline());
+    }
+
+    public function test_code(): void
+    {
+        $annotations = Annotations::create()->code();
+
+        $this->assertTrue($annotations->isCode());
+    }
+
+    public function test_change_color(): void
+    {
+        $annotations = Annotations::create()->withColor("red");
+
+        $this->assertEquals("red", $annotations->color());
+    }
+
+    public function test_change_unsupported_color(): void
+    {
+        $this->expectException(\Exception::class);
+        Annotations::create()->withColor("not-a-color");
+    }
+}