diff --git a/tests/items.test.js b/tests/items.test.js
index 88e2700..281a922 100644
--- a/tests/items.test.js
+++ b/tests/items.test.js
@@ -6,6 +6,7 @@ const {
 	iconDefinitions,
 	fileExtensions,
 	fileNames,
+	languageIds,
 } = require('./../src/data/items.json');
 const colors = require('./../src/data/colors.json');
 
@@ -16,6 +17,7 @@ function runTests() {
 	testThemeItems();
 
 	testFileDefinitions();
+	testLanguageIds();
 }
 
 function testIconColors() {
@@ -65,6 +67,16 @@ function testFileDefinitions() {
 	}
 }
 
+function testLanguageIds() {
+	for (const languageId in languageIds) {
+		const itemType = languageIds[languageId];
+
+		test(`${languageId} has a valid ${itemType} value`, (t) => {
+			t.true(itemType in iconDefinitions);
+		});
+	}
+}
+
 function testIconProp(themeId, propName, condition) {
 	const iconProps = getIconProps(propName);
 	for (const entryName in iconProps) {