test: refactor OptionCoder tests (#1006)

.changeset/clean-squids-burn.md

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+---
+---

packages/abi-coder/src/coders/option.test.ts

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+/* eslint-disable @typescript-eslint/ban-ts-comment */
+import { BN } from '@fuel-ts/math';
+
+import { U8_MAX } from '../../test/utils/constants';
+
+import OptionCoder from './option';
+import U64Coder from './u64';
+
+describe('OptionCoder', () => {
+  it('should encode a some u64 option ', () => {
+    const coder = new OptionCoder('test option', { Some: new U64Coder() });
+    const expected = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255]);
+    // @ts-expect-error
+    const actual = coder.encode(U8_MAX);
+
+    expect(actual).toStrictEqual(expected);
+  });
+
+  it('should decode a some u64 option', () => {
+    const coder = new OptionCoder('test option', { Some: new U64Coder() });
+    const expectedValue = U8_MAX;
+    const expectedLength = 16;
+    const [actualValue, actualLength] = coder.decode(
+      new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255]),
+      0
+    );
+
+    expect(actualValue).toBeInstanceOf(BN);
+    expect((actualValue as unknown as BN).toNumber()).toBe(expectedValue);
+    expect(actualLength).toBe(expectedLength);
+  });
+
+  it('should encode a none u64 option', () => {
+    const coder = new OptionCoder('test option', { None: new U64Coder() });
+    const expected = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+    // @ts-expect-error
+    const actual = coder.encode(undefined);
+
+    expect(actual).toStrictEqual(expected);
+  });
+
+  it('should decode a none u64 option', () => {
+    const coder = new OptionCoder('test option', { None: new U64Coder() });
+    const expectedValue = undefined;
+    const expectedLength = 16;
+    const [actualValue, actualLength] = coder.decode(
+      new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]),
+      0
+    );
+
+    expect(actualValue).toBe(expectedValue);
+    expect(actualLength).toBe(expectedLength);
+  });
+});