diff --git a/tests/iso-date/Date.test.ts b/tests/iso-date/Date.test.ts
index 687002f11..cc778d777 100644
--- a/tests/iso-date/Date.test.ts
+++ b/tests/iso-date/Date.test.ts
@@ -87,6 +87,7 @@ describe('GraphQLDate', () => {
       };
 
       it(`parses literal ${stringify(literal)} into javascript Date ${stringify(expected)}`, () => {
+        // @ts-expect-error - intentional invalid input
         expect(GraphQLDate.parseLiteral(literal, {})).toEqual(expected);
       });
     });
@@ -97,6 +98,7 @@ describe('GraphQLDate', () => {
         value,
       };
       it(`errors when parsing invalid literal ${stringify(invalidLiteral)}`, () => {
+        // @ts-expect-error - intentional invalid input
         expect(() => GraphQLDate.parseLiteral(invalidLiteral, {})).toThrowErrorMatchingSnapshot();
       });
     });
diff --git a/tests/iso-date/DateTime.test.ts b/tests/iso-date/DateTime.test.ts
index a20569385..877603f0e 100644
--- a/tests/iso-date/DateTime.test.ts
+++ b/tests/iso-date/DateTime.test.ts
@@ -128,6 +128,7 @@ describe('GraphQLDateTime', () => {
       };
 
       it(`parses literal ${stringify(literal)} into javascript Date ${stringify(expected)}`, () => {
+        // @ts-expect-error - intentional invalid input
         expect(GraphQLDateTime.parseLiteral(literal, {})).toEqual(expected);
       });
     });
@@ -139,6 +140,7 @@ describe('GraphQLDateTime', () => {
       };
       it(`errors when parsing invalid literal ${stringify(invalidLiteral)}`, () => {
         expect(() =>
+          // @ts-expect-error - intentional invalid input
           GraphQLDateTime.parseLiteral(invalidLiteral, {}),
         ).toThrowErrorMatchingSnapshot();
       });