diff --git a/src/lib/validate.js b/src/lib/validate.js
index edbb61a..7383b92 100644
--- a/src/lib/validate.js
+++ b/src/lib/validate.js
@@ -32,5 +32,4 @@ export default (array, categories) => {
   if (uniqueCategoryNames.size !== categories.length) {
     throw new TypeError("categories must have unique names");
   }
-  return true;
 };
diff --git a/src/lib/validate.test.js b/src/lib/validate.test.js
index 5900cb2..b691cd2 100644
--- a/src/lib/validate.test.js
+++ b/src/lib/validate.test.js
@@ -7,8 +7,9 @@ test("arguments are validated", () => {
     { name: "Taxi", type: "Bird" },
   ];
   const categories = [{ name: "cats", filter: ({ type }) => type === "Cat" }];
-  const validatedArgs = validate(array, categories);
-  expect(validatedArgs).toBe(true);
+  expect(() => {
+    validate(array, categories);
+  }).not.toThrow();
 });
 
 test("array is required", () => {