diff --git a/src/common/constants.js b/src/common/constants.js
index f0a8bd85..77b89871 100644
--- a/src/common/constants.js
+++ b/src/common/constants.js
@@ -49,6 +49,13 @@ export const CHAIN_METHODS = {
     method: 'GET',
     params: ['blockHeight', 'includeTransactions']
   },
+  getContractViewMethodList: {
+    name: 'getContractViewMethodList',
+    call: 'blockChain/ContractViewMethodList',
+    method: 'GET',
+    params: ['address'],
+    inputFormatter: []
+  },
   getTxResult: {
     name: 'getTxResult',
     call: 'blockChain/transactionResult',
diff --git a/test/unit/chain/index.test.js b/test/unit/chain/index.test.js
new file mode 100644
index 00000000..558a622d
--- /dev/null
+++ b/test/unit/chain/index.test.js
@@ -0,0 +1,125 @@
+import Chain from '../../../src/chain/index';
+import RequestManager from '../../../src/util/requestManage';
+import HttpProvider from '../../../src/util/httpProvider';
+import AElf from '../../../src';
+import { noop } from '../../../src/util/utils';
+const stageEndpoint = 'https://tdvw-test-node.aelf.io/';
+const testEndpoint = 'https://explorer-test-side02.aelf.io/chain';
+let httpProvider, requestManager, chain;
+
+describe('chain should work', () => {
+  beforeEach(() => {
+    httpProvider = new HttpProvider(stageEndpoint);
+    requestManager = new RequestManager(httpProvider);
+    chain = new Chain(requestManager);
+  });
+  test('test is chain method on object', () => {
+    expect(chain.getChainStatus).toBeInstanceOf(Function);
+  });
+  test('test fn argument into object ', () => {
+    const fn = new Function();
+    const args = [fn];
+    const result = chain.extractArgumentsIntoObject(args);
+    expect(result.callback).toBe(fn);
+  });
+  test('test undefined argument into object ', () => {
+    const args = [undefined];
+    const result = chain.extractArgumentsIntoObject(args);
+    expect(result.callback).toBe(noop);
+    expect(result.isSync).toBe(false);
+  });
+  test('test sync argument into object', () => {
+    const args = [{ sync: true }];
+    const result = chain.extractArgumentsIntoObject(args);
+    expect(result.isSync).toBeTruthy();
+  });
+  test('test is concrete contract when sync', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const { GenesisContractAddress } = await aelf.chain.getChainStatus();
+    const args = [{ sync: true }];
+    const contract = await chain.contractAt(GenesisContractAddress, null, ...args);
+    expect(contract.deserializeLog).toBeInstanceOf(Function);
+  });
+  test('test is invalid contract when sync', async () => {
+    const address = 'ELF_iUY5CLwzU8L8vjVgH95vx3ZRuvD5d9hVK3EdPMVD8v9EaQT75_AELF';
+    const args = [{ sync: true }];
+    // mock contractFileDescriptorSet
+    chain.getContractFileDescriptorSet = jest.fn(() => {
+      return {
+        file: []
+      };
+    });
+    expect(() => chain.contractAt(address, null, ...args)).toThrow('no such contract');
+  });
+  test('test is concrete contract when async', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const { GenesisContractAddress } = await aelf.chain.getChainStatus();
+    const contract = await chain.contractAt(GenesisContractAddress, null);
+    expect(contract.deserializeLog).toBeInstanceOf(Function);
+  });
+  test('test is invalid contract when async', async () => {
+    const address = 'ELF_iUY5CLwzU8L8vjVgH95vx3ZRuvD5d9hVK3EdPMVD8v9EaQT75_AELF';
+    chain.getContractFileDescriptorSet = jest.fn(() => {
+      return Promise.resolve({
+        file: []
+      });
+    });
+    let error;
+    chain.extractArgumentsIntoObject = jest.fn(() => {
+      return {
+        callback: e => {
+          error = e;
+        },
+        isSync: false
+      };
+    });
+    await chain.contractAt(address, null);
+    expect(error).toEqual(new Error('no such contract'));
+  }, 5000);
+  test('test is invalid contract with noop callback', async () => {
+    const address = 'ELF_iUY5CLwzU8L8vjVgH95vx3ZRuvD5d9hVK3EdPMVD8v9EaQT75_AELF';
+    chain.getContractFileDescriptorSet = jest.fn(() => {
+      return Promise.resolve({
+        file: []
+      });
+    });
+    await expect(chain.contractAt(address, null)).rejects.toEqual(new Error('no such contract'));
+  }, 5000);
+  test('test txId has corresponding transaction in the block with height when sync', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const blockInfo = await aelf.chain.getBlockByHeight(1, true);
+    const txId = blockInfo.Body.Transactions[0];
+    const result = Array.isArray(aelf.chain.getMerklePath(txId, 1, { sync: true }));
+    expect(result).toBe(true);
+  }, 5000);
+  test('test txId has no corresponding transaction in the block with height when sync', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const blockInfo = await chain.getBlockByHeight(1, true);
+    const txId = blockInfo.Body.Transactions[0];
+    await expect(() => aelf.chain.getMerklePath(txId, 2, { sync: true })).toThrow(
+      'txId dce643d5c142945dc9f0665819dbf0b268b8423a94fa7a488d24cd89c0b67a23 has no correspond transaction in the block with height 2'
+    );
+  }, 20000);
+
+  test('test txId has corresponding transaction in the block with height when async', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const blockInfo = await aelf.chain.getBlockByHeight(1, true);
+    const txId = blockInfo.Body.Transactions[0];
+    const result = await aelf.chain.getMerklePath(txId, 1);
+    expect(Array.isArray(result)).toBe(true);
+  }, 80000);
+  test('test txId has no corresponding transaction in the block with height when async', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(stageEndpoint));
+    const blockInfo = await aelf.chain.getBlockByHeight(1, true);
+    const txId = blockInfo.Body.Transactions[0];
+    await expect(async () => await aelf.chain.getMerklePath(txId, 2)).rejects.toThrow(
+      'txId dce643d5c142945dc9f0665819dbf0b268b8423a94fa7a488d24cd89c0b67a23 has no correspond transaction in the block with height 2'
+    );
+  });
+  test('should show list of ContractViewMethod', async () => {
+    const aelf = new AElf(new AElf.providers.HttpProvider(testEndpoint));
+    const address = '2WzfRW6KZhAfh3gCZ8Akw4wcti69GUNc1F2sXNa2fgjndv59bE';
+    const result = await aelf.chain.getContractViewMethodList(address);
+    await expect(Array.isArray(result)).toBe(true);
+  });
+}, 20000);