rename file plus add test case

src/validateParentChain.unit.test.ts

@@ -0,0 +1,31 @@
+import { it, expect } from 'vitest';
+
+import { validateParentChain } from './types/ParentChain';
+import { arbitrumOne, registerCustomParentChain } from './chains';
+import { generateChainId } from './utils';
+
+import { testHelper_createCustomParentChain } from './customChainsTestHelpers';
+
+it(`sucessfully validates arbitrum one`, () => {
+  const result = validateParentChain(arbitrumOne.id);
+
+  expect(result.chainId).toEqual(arbitrumOne.id);
+  expect(result.isCustom).toEqual(false);
+});
+
+it(`throws for an unregistered custom parent chain`, () => {
+  const id = generateChainId();
+
+  expect(() => validateParentChain(id)).toThrowError(`Parent chain not supported: ${id}`);
+});
+
+it(`sucessfully validates a registered custom parent chain`, () => {
+  const chain = testHelper_createCustomParentChain();
+
+  registerCustomParentChain(chain);
+
+  const result = validateParentChain(chain.id);
+
+  expect(result.chainId).toEqual(chain.id);
+  expect(result.isCustom).toEqual(true);
+});