diff --git a/Assets/Editor/OptionPromptMetadataTests.cs b/Assets/Editor/OptionPromptMetadataTests.cs
new file mode 100644
index 000000000..869214aa5
--- /dev/null
+++ b/Assets/Editor/OptionPromptMetadataTests.cs
@@ -0,0 +1,44 @@
+using AibisDream.Utility;
+using NUnit.Framework;
+using Yarn.Unity;
+
+namespace AibisDream.SystemEditor.Tests
+{
+    public sealed class OptionPromptMetadataTests
+    {
+        [Test]
+        public void IsOptionPromptLine_WithExactMetadata_ReturnsTrue()
+        {
+            var line = new LocalizedLine
+            {
+                Metadata = new[] { "line:0123456", YarnUtil.OptionPrompt }
+            };
+
+            Assert.That(line.IsOptionPromptLine(), Is.True);
+        }
+
+        [TestCase("option_prompts")]
+        [TestCase("dream_option_prompt")]
+        [TestCase("OPTION_PROMPT")]
+        public void IsOptionPromptLine_WithSimilarMetadata_ReturnsFalse(string metadata)
+        {
+            var line = new LocalizedLine
+            {
+                Metadata = new[] { metadata }
+            };
+
+            Assert.That(line.IsOptionPromptLine(), Is.False);
+        }
+
+        [Test]
+        public void IsOptionPromptLine_WithoutMetadata_ReturnsFalse()
+        {
+            var line = new LocalizedLine
+            {
+                Metadata = null
+            };
+
+            Assert.That(line.IsOptionPromptLine(), Is.False);
+        }
+    }
+}
diff --git a/Assets/Editor/OptionPromptMetadataTests.cs.meta b/Assets/Editor/OptionPromptMetadataTests.cs.meta
new file mode 100644
index 000000000..3a88d584a
--- /dev/null
+++ b/Assets/Editor/OptionPromptMetadataTests.cs.meta
@@ -0,0 +1,11 @@
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