1 files changed, 8 insertions, 0 deletions
diff --git a/packages/contracts/test/libraries/lib_bytes.ts b/packages/contracts/test/libraries/lib_bytes.ts
index ce3adbdae..fc28c363b 100644
--- a/packages/contracts/test/libraries/lib_bytes.ts
+++ b/packages/contracts/test/libraries/lib_bytes.ts
@@ -248,4 +248,12 @@ describe('LibBytes', () => {
         it('should fail if the length between the offset and end of the byte array is too short to hold a uint256)', async () => {});
     });
     */
+
+    describe('readFirst4', () => {
+        it('should return the first 4 bytes of a byte array of arbitrary length', async () => {
+            const first4Bytes = libBytes.publicReadFirst4.callAsync(byteArrayLongerThan32Bytes);
+            const expectedFirst4Bytes = byteArrayLongerThan32Bytes.slice(0, 10);
+            expect(first4Bytes).to.equal(expectedFirst4Bytes);
+        });
+    });
 });