chore: add tests to EnumCoder (#2515)

Co-authored-by: Daniel Bate <djbate23@gmail.com>
Co-authored-by: Peter Smith <peter@blueoceancomputing.co.uk>
Co-authored-by: Chad Nehemiah <chad.nehemiah94@gmail.com>

.changeset/rotten-walls-tickle.md

@@ -0,0 +1,4 @@
+---
+---
+
+chore: add tests to `EnumCoder`

packages/abi-coder/src/encoding/coders/EnumCoder.test.ts

@@ -59,6 +59,13 @@ describe('EnumCoder', () => {
         new FuelError(ErrorCode.INVALID_DECODE_VALUE, `Invalid case 'c'. Valid cases: 'a', 'b'.`)
       );
     });
+
+    it('should throw an error when multiple fields are provided', async () => {
+      await expectToThrowFuelError(
+        () => coder.encode({ a: 'test', b: 'test' } as never),
+        new FuelError(ErrorCode.INVALID_DECODE_VALUE, 'Only one field must be provided.')
+      );
+    });
   });
 
   describe('decode', () => {
@@ -122,5 +129,14 @@ describe('EnumCoder', () => {
         new FuelError(ErrorCode.DECODE_ERROR, 'Invalid enum data size.')
       );
     });
+
+    it('throws when decoding data that is too short', async () => {
+      const input = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 1]);
+
+      await expectToThrowFuelError(
+        () => coder.decode(input, 0),
+        new FuelError(ErrorCode.DECODE_ERROR, 'Invalid enum data size.')
+      );
+    });
   });
 });