diff --git a/clients/client-cognito-identity/.gitignore b/clients/client-cognito-identity/.gitignore
index b41c05b597c42..35f221867ed0d 100644
--- a/clients/client-cognito-identity/.gitignore
+++ b/clients/client-cognito-identity/.gitignore
@@ -11,4 +11,5 @@ package-lock.json
 
 *.d.ts
 *.js
+!karma.conf.js
 *.js.map
diff --git a/clients/client-cognito-identity/.npmignore b/clients/client-cognito-identity/.npmignore
index b7ff81137c4ad..e40c82df262c4 100644
--- a/clients/client-cognito-identity/.npmignore
+++ b/clients/client-cognito-identity/.npmignore
@@ -1,4 +1,6 @@
 /coverage/
 /docs/
+/e2e/
 tsconfig.test.json
 *.tsbuildinfo
+jest.config.js
diff --git a/clients/client-cognito-identity/e2e/CognitoIdentity.ispec.ts b/clients/client-cognito-identity/e2e/CognitoIdentity.ispec.ts
new file mode 100644
index 0000000000000..09d9780bbac0b
--- /dev/null
+++ b/clients/client-cognito-identity/e2e/CognitoIdentity.ispec.ts
@@ -0,0 +1,111 @@
+/// <reference types="mocha" />
+/**
+ * This is the integration test that make sure the client can make request cross-platform-ly
+ * in NodeJS, Chromium and Firefox. This test is written in mocha.
+ */
+import { expect } from "chai";
+import { CognitoIdentity } from "../index";
+import { Credentials } from "@aws-sdk/types";
+import { IAM } from "@aws-sdk/client-iam";
+// There will be default values of defaultRegion, credentials, and isBrowser variable in browser tests.
+// Define the values for Node.js tests
+const region: string | undefined =
+  (globalThis as any).defaultRegion || undefined;
+const credentials: Credentials | undefined =
+  (globalThis as any).credentials || undefined;
+
+describe("@aws-sdk/client-cognito-identity", function () {
+  this.timeout(50000);
+  // Required in run
+  const unAuthClient = new CognitoIdentity({
+    region
+  });
+  const authClient = new CognitoIdentity({
+    credentials,
+    region
+  });
+  const iam = new IAM({ credentials, region });
+  const identityPoolName = `aws_sdk_unit_test_${Date.now()}`;
+  const identityPoolRoleName = `${identityPoolName}-role`;
+  let identityPoolRole: string;
+  let identityPoolId: string;
+
+  before(async () => {
+    // Create an identity pool
+    const createIdentityPoolResult = await authClient.createIdentityPool({
+      IdentityPoolName: identityPoolName,
+      AllowUnauthenticatedIdentities: true
+    });
+    expect(createIdentityPoolResult.$metadata.httpStatusCode).to.equal(200);
+    expect(typeof createIdentityPoolResult.IdentityPoolId).to.equal("string");
+    identityPoolId = createIdentityPoolResult.IdentityPoolId as string;
+
+    // Create a role to be attached to identity pool
+    const { Role } = await iam.createRole({
+      RoleName: identityPoolRoleName,
+      AssumeRolePolicyDocument: `{
+    "Version": "2012-10-17",
+    "Statement": [
+      {
+        "Effect": "Allow",
+        "Principal": {
+          "Federated": "cognito-identity.amazonaws.com"
+        },
+        "Action": "sts:AssumeRoleWithWebIdentity"
+      }
+    ]
+  }`
+    });
+    identityPoolRole = Role?.Arn as string;
+
+    // wait for role creating
+    // TODO: add RoleExists waiter
+    await new Promise(resolve => setTimeout(resolve, 5000));
+
+    // Set role to identity pool
+    await authClient.setIdentityPoolRoles({
+      IdentityPoolId: identityPoolId,
+      Roles: {
+        unauthenticated: identityPoolRole!
+      }
+    });
+
+    // wait for role propagating
+    // TODO: add waiters
+    await new Promise(resolve => setTimeout(resolve, 10000));
+  });
+
+  after(async () => {
+    // Delete the identity pool
+    if (identityPoolId) {
+      await authClient.deleteIdentityPool({
+        IdentityPoolId: identityPoolId
+      });
+    }
+    // Delete identity pool role
+    if (identityPoolRole) {
+      await iam.deleteRole({ RoleName: identityPoolRoleName });
+    }
+  });
+
+  it("should successfully fetch Id and get credentials", async () => {
+    // Test getId()
+    const getIdResult = await unAuthClient.getId({
+      IdentityPoolId: identityPoolId
+    });
+    expect(getIdResult.$metadata.httpStatusCode).to.equal(200);
+    expect(typeof getIdResult.IdentityId).to.equal("string");
+
+    // Test getCredentialsForIdentity() with Id from above
+    const getCredentialsResult = await unAuthClient.getCredentialsForIdentity({
+      IdentityId: getIdResult.IdentityId
+    });
+    expect(getCredentialsResult.$metadata.httpStatusCode).to.equal(200);
+    expect(typeof getCredentialsResult.Credentials?.AccessKeyId).to.equal(
+      "string"
+    );
+    expect(typeof getCredentialsResult.Credentials?.SecretKey).to.equal(
+      "string"
+    );
+  });
+});
diff --git a/clients/client-cognito-identity/karma.conf.js b/clients/client-cognito-identity/karma.conf.js
new file mode 100644
index 0000000000000..32475f3900c6f
--- /dev/null
+++ b/clients/client-cognito-identity/karma.conf.js
@@ -0,0 +1,64 @@
+module.exports = function (config) {
+  config.set({
+    basePath: "",
+    frameworks: ["mocha", "chai"],
+    files: ["e2e/**/*.ispec.ts"],
+    preprocessors: {
+      "e2e/**/*.ispec.ts": ["webpack", "sourcemap", "credentials"]
+    },
+    webpackMiddleware: {
+      stats: "minimal"
+    },
+    webpack: {
+      resolve: {
+        extensions: [".ts", ".js"]
+      },
+      mode: "development",
+      module: {
+        rules: [
+          {
+            test: /\.tsx?$/,
+            use: [
+              {
+                loader: "ts-loader",
+                options: {
+                  configFile: "tsconfig.json",
+                  compilerOptions: {
+                    rootDir: "./"
+                  }
+                }
+              }
+            ],
+            exclude: /node_modules/
+          }
+        ]
+      },
+      devtool: "inline-source-map"
+    },
+    plugins: [
+      "@aws-sdk/karma-credential-loader",
+      "karma-chrome-launcher",
+      "karma-firefox-launcher",
+      "karma-mocha",
+      "karma-chai",
+      "karma-webpack",
+      "karma-coverage",
+      "karma-sourcemap-loader"
+    ],
+    reporters: ["progress"],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_WARN,
+    autoWatch: false,
+    browsers: ["ChromeHeadless", "FirefoxHeadless"],
+    customLaunchers: {
+      FirefoxHeadless: {
+        base: "Firefox",
+        flags: ["-headless"]
+      }
+    },
+    singleRun: true,
+    concurrency: Infinity,
+    exclude: ["**/*.d.ts", "*.spec.ts"]
+  });
+};
diff --git a/clients/client-cognito-identity/package.json b/clients/client-cognito-identity/package.json
index 15b534ae08c3f..2b0156708732e 100644
--- a/clients/client-cognito-identity/package.json
+++ b/clients/client-cognito-identity/package.json
@@ -12,7 +12,9 @@
     "remove-documentation": "rimraf ./docs",
     "remove-js": "rimraf *.js && rimraf ./commands/*.js && rimraf ./models/*.js && rimraf ./protocols/*.js",
     "remove-maps": "rimraf *.js.map && rimraf ./commands/*.js.map && rimraf ./models/*.js.map && rimraf ./protocols/*.js.map",
-    "test": "exit 0",
+    "test:unit": "mocha **/cjs/**/*.spec.js",
+    "test:e2e": "mocha **/cjs/**/*.ispec.js && karma start karma.conf.js",
+    "test": "yarn test:unit",
     "build:es": "tsc -p tsconfig.es.json",
     "build": "yarn pretest && yarn build:es"
   },
@@ -60,8 +62,10 @@
     "tslib": "^1.8.0"
   },
   "devDependencies": {
+    "@types/chai": "^4.2.11",
+    "@types/mocha": "^7.0.2",
     "@types/node": "^12.7.5",
-    "jest": "^25.1.0",
+    "@aws-sdk/client-iam": "1.0.0-gamma.2",
     "rimraf": "^3.0.0",
     "tslib": "^1.8.0",
     "typedoc": "^0.15.0",
diff --git a/clients/client-cognito-identity/tsconfig.json b/clients/client-cognito-identity/tsconfig.json
index ca2fadc08187b..3b53843739832 100644
--- a/clients/client-cognito-identity/tsconfig.json
+++ b/clients/client-cognito-identity/tsconfig.json
@@ -12,7 +12,8 @@
     "incremental": true,
     "resolveJsonModule": true,
     "declarationDir": "./types",
-    "outDir": "dist/cjs"
+    "outDir": "dist/cjs",
+    "types": ["mocha", "node"]
   },
   "typedocOptions": {
     "exclude": "**/node_modules/**",