Add stake verification unit tests

Author: charityagbenu12-cmd

src/stake-verification/stake-verification.service.spec.ts

@@ -0,0 +1,29 @@
+import { StakeVerificationService } from './stake-verification.service';
+import { ConfigService } from '@nestjs/config';
+
+const makeService = () => {
+  const cfg = { get: (k: string) => 'https://example.org' } as unknown as ConfigService;
+  const cache = { get: jest.fn(), set: jest.fn(), del: jest.fn() } as any;
+  const svc = new StakeVerificationService(cfg, cache);
+  // patch private query method
+  return { svc, cache };
+};
+
+describe('StakeVerificationService', () => {
+  it('verifies eligible provider', async () => {
+    const { svc } = makeService();
+    // @ts-ignore
+    svc.queryStakeFromSoroban = jest.fn(async () => '2000');
+    const res = await svc.verifyProviderStake({ publicKey: 'GABC' } as any);
+    expect(res.verified).toBe(true);
+    expect(res.stakeAmount).toBe('2000');
+  });
+
+  it('rejects ineligible provider', async () => {
+    const { svc } = makeService();
+    // @ts-ignore
+    svc.queryStakeFromSoroban = jest.fn(async () => '10');
+    const res = await svc.verifyProviderStake({ publicKey: 'GXYZ' } as any);
+    expect(res.verified).toBe(false);
+  });
+});