diff --git a/src/rln_contract.spec.ts b/src/rln_contract.spec.ts
new file mode 100644
index 0000000..04ddd51
--- /dev/null
+++ b/src/rln_contract.spec.ts
@@ -0,0 +1,61 @@
+import chai from "chai";
+import spies from "chai-spies";
+import * as ethers from "ethers";
+
+import * as rln from "./index.js";
+
+chai.use(spies);
+
+describe("RLN Contract abstraction", () => {
+  it("should be able to fetch members from events and store to rln instance", async () => {
+    const rlnInstance = await rln.create();
+
+    chai.spy.on(rlnInstance, "insertMember");
+
+    const voidSigner = new ethers.VoidSigner(rln.GOERLI_CONTRACT.address);
+    const rlnContract = new rln.RLNContract({
+      address: rln.GOERLI_CONTRACT.address,
+      provider: voidSigner,
+    });
+
+    chai.spy.on(rlnContract, "contract.queryFilter", () =>
+      Promise.resolve([mockEvent()])
+    );
+
+    await rlnContract.fetchMembers(rlnInstance);
+
+    chai.expect(rlnInstance.insertMember).to.have.been.called();
+  });
+
+  it("should register a member by signature", async () => {
+    const mockSignature =
+      "0xdeb8a6b00a8e404deb1f52d3aa72ed7f60a2ff4484c737eedaef18a0aacb2dfb4d5d74ac39bb71fa358cf2eb390565a35b026cc6272f2010d4351e17670311c21c";
+
+    const rlnInstance = await rln.create();
+    const voidSigner = new ethers.VoidSigner(rln.GOERLI_CONTRACT.address);
+    const rlnContract = new rln.RLNContract({
+      address: rln.GOERLI_CONTRACT.address,
+      provider: voidSigner,
+    });
+
+    chai.spy.on(rlnContract, "contract.MEMBERSHIP_DEPOSIT", () =>
+      Promise.resolve(1)
+    );
+
+    const contractSpy = chai.spy.on(rlnContract, "contract.register");
+
+    await rlnContract.registerMember(rlnInstance, mockSignature);
+
+    chai.expect(contractSpy).to.have.been.called();
+  });
+});
+
+function mockEvent(): ethers.Event {
+  return {
+    args: {
+      pubkey:
+        "C4qAaeoqKlLv4Df910gnyuCfKLk7uhIhLZgcQfOMncYJpfZqW+Pdlv3ie6hm4WkGLaS5UIO2QPbyhN4EGx73c8vkTqjv5gK49w/pGIDi+ILMjYqYKexSwJPmPOMn0XM0FDbQ5wwXmZ4SIauYiQM8faZLDk8ltkAsIX/TKA6Dgw0=",
+      index: 1,
+    },
+  } as unknown as ethers.Event;
+}