diff --git a/.github/workflows/e2e.yml b/.github/workflows/test.yml
similarity index 63%
rename from .github/workflows/e2e.yml
rename to .github/workflows/test.yml
index f4f092d2..b1e49e31 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/test.yml
@@ -1,8 +1,23 @@
-name: E2E Testing
+name: Testing
 
 on: [pull_request]
 
 jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20.x]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Install dependencies
+      run: npm install
+    - name: Run Unit Tests
+      run: npm run test:unit
   e2e-test:
     runs-on: ubuntu-latest
     strategy:
diff --git a/jest.config.ts b/jest.config.ts
index 2130dc13..6bca3938 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -11,15 +11,17 @@ const config: Config = {
     "node_modules",
     "src",
   ],
-  preset: 'ts-jest',
+  preset: 'ts-jest/presets/js-with-ts-esm',
   setupFilesAfterEnv: ['<rootDir>/test/jest-setup.ts'],
   testEnvironment: "node",
   testRegex: [
     '.*\\.test\\.ts$',
   ],
+  transformIgnorePatterns: ['node_modules/(?!cli-testing-library)'],
   transform: {
     '^.+\\.(ts|tsx)$': ['ts-jest', {
       diagnostics: false,
+      useESM: true
     }],
   }
 };
diff --git a/package.json b/package.json
index 56e6a652..6764a61a 100644
--- a/package.json
+++ b/package.json
@@ -48,8 +48,12 @@
     "deploy": "npm version patch && npm run build:push && git push --tags && npm publish --tag latest",
     "lint": "eslint src --ext ts && tsc --noEmit",
     "format": "prettier --write src",
+    "test:all": "npm run test:unit:docker && npm run test:e2e:docker",
+    "test:docker-build": "docker build -t oco-test -f test/Dockerfile .",
+    "test:unit": "NODE_OPTIONS=--experimental-vm-modules jest test/unit",
+    "test:unit:docker": "npm run test:docker-build && DOCKER_CONTENT_TRUST=0 docker run --rm oco-test npm run test:unit",
     "test:e2e": "jest test/e2e",
-    "test:e2e:docker": "docker build -t oco-e2e -f test/Dockerfile . && DOCKER_CONTENT_TRUST=0 docker run oco-e2e"
+    "test:e2e:docker": "npm run test:docker-build && DOCKER_CONTENT_TRUST=0 docker run --rm oco-test npm run test:e2e"
   },
   "devDependencies": {
     "@commitlint/types": "^17.4.4",
diff --git a/src/commands/config.ts b/src/commands/config.ts
index e038312e..d877db38 100644
--- a/src/commands/config.ts
+++ b/src/commands/config.ts
@@ -4,15 +4,13 @@ import * as dotenv from 'dotenv';
 import { existsSync, readFileSync, writeFileSync } from 'fs';
 import { parse as iniParse, stringify as iniStringify } from 'ini';
 import { homedir } from 'os';
-import { join as pathJoin } from 'path';
+import { join as pathJoin, resolve as pathResolve } from 'path';
 
 import { intro, outro } from '@clack/prompts';
 
 import { COMMANDS } from '../CommandsEnum';
 import { getI18nLocal } from '../i18n';
 
-dotenv.config();
-
 export enum CONFIG_KEYS {
   OCO_OPENAI_API_KEY = 'OCO_OPENAI_API_KEY',
   OCO_ANTHROPIC_API_KEY = 'OCO_ANTHROPIC_API_KEY',
@@ -248,9 +246,17 @@ export type ConfigType = {
   [key in CONFIG_KEYS]?: any;
 };
 
-const configPath = pathJoin(homedir(), '.opencommit');
-
-export const getConfig = (): ConfigType | null => {
+const defaultConfigPath = pathJoin(homedir(), '.opencommit');
+const defaultEnvPath = pathResolve(process.cwd(), '.env');
+
+export const getConfig = ({
+  configPath = defaultConfigPath,
+  envPath = defaultEnvPath
+}: {
+  configPath?: string
+  envPath?: string
+} = {}): ConfigType | null => {
+  dotenv.config({ path: envPath });
   const configFromEnv = {
     OCO_OPENAI_API_KEY: process.env.OCO_OPENAI_API_KEY,
     OCO_ANTHROPIC_API_KEY: process.env.OCO_ANTHROPIC_API_KEY,
@@ -306,7 +312,7 @@ export const getConfig = (): ConfigType | null => {
   return config;
 };
 
-export const setConfig = (keyValues: [key: string, value: string][]) => {
+export const setConfig = (keyValues: [key: string, value: string][], configPath: string = defaultConfigPath) => {
   const config = getConfig() || {};
 
   for (const [configKey, configValue] of keyValues) {
diff --git a/test/Dockerfile b/test/Dockerfile
index 80c8f3c2..5b779174 100644
--- a/test/Dockerfile
+++ b/test/Dockerfile
@@ -17,5 +17,3 @@ RUN ls -la
 
 RUN npm install
 RUN npm run build
-
-CMD ["npm", "run", "test:e2e"]
diff --git a/test/unit/config.test.ts b/test/unit/config.test.ts
new file mode 100644
index 00000000..4c596aea
--- /dev/null
+++ b/test/unit/config.test.ts
@@ -0,0 +1,105 @@
+import { getConfig } from '../../src/commands/config';
+import { prepareFile } from './utils';
+
+describe('getConfig', () => {
+  const originalEnv = { ...process.env };
+  function resetEnv(env: NodeJS.ProcessEnv) {
+    Object.keys(process.env).forEach((key) => {
+      if (!(key in env)) {
+        delete process.env[key];
+      } else {
+        process.env[key] = env[key];
+      }
+    });
+  }
+
+  beforeEach(() => {
+    resetEnv(originalEnv);
+  });
+
+  afterAll(() => {
+    resetEnv(originalEnv);
+  });
+
+  it('return config values from the global config file', async () => {
+    const configFile = await prepareFile(
+      '.opencommit',
+      `
+OCO_OPENAI_API_KEY="sk-key"
+OCO_ANTHROPIC_API_KEY="secret-key"
+OCO_TOKENS_MAX_INPUT="8192"
+OCO_TOKENS_MAX_OUTPUT="1000"
+OCO_OPENAI_BASE_PATH="/openai/api"
+OCO_DESCRIPTION="true"
+OCO_EMOJI="true"
+OCO_MODEL="gpt-4"
+OCO_LANGUAGE="de"
+OCO_MESSAGE_TEMPLATE_PLACEHOLDER="$m"
+OCO_PROMPT_MODULE="@commitlint"
+OCO_AI_PROVIDER="ollama"
+OCO_GITPUSH="false"
+OCO_ONE_LINE_COMMIT="true"
+`
+    );
+    const config = getConfig({ configPath: configFile.filePath, envPath: '' });
+
+    expect(config).not.toEqual(null);
+    expect(config!['OCO_OPENAI_API_KEY']).toEqual('sk-key');
+    expect(config!['OCO_ANTHROPIC_API_KEY']).toEqual('secret-key');
+    expect(config!['OCO_TOKENS_MAX_INPUT']).toEqual(8192);
+    expect(config!['OCO_TOKENS_MAX_OUTPUT']).toEqual(1000);
+    expect(config!['OCO_OPENAI_BASE_PATH']).toEqual('/openai/api');
+    expect(config!['OCO_DESCRIPTION']).toEqual(true);
+    expect(config!['OCO_EMOJI']).toEqual(true);
+    expect(config!['OCO_MODEL']).toEqual('gpt-4');
+    expect(config!['OCO_LANGUAGE']).toEqual('de');
+    expect(config!['OCO_MESSAGE_TEMPLATE_PLACEHOLDER']).toEqual('$m');
+    expect(config!['OCO_PROMPT_MODULE']).toEqual('@commitlint');
+    expect(config!['OCO_AI_PROVIDER']).toEqual('ollama');
+    expect(config!['OCO_GITPUSH']).toEqual(false);
+    expect(config!['OCO_ONE_LINE_COMMIT']).toEqual(true);
+
+    await configFile.cleanup();
+  });
+
+  it('return config values from the local env file', async () => {
+    const envFile = await prepareFile(
+      '.env',
+      `
+OCO_OPENAI_API_KEY="sk-key"
+OCO_ANTHROPIC_API_KEY="secret-key"
+OCO_TOKENS_MAX_INPUT="8192"
+OCO_TOKENS_MAX_OUTPUT="1000"
+OCO_OPENAI_BASE_PATH="/openai/api"
+OCO_DESCRIPTION="true"
+OCO_EMOJI="true"
+OCO_MODEL="gpt-4"
+OCO_LANGUAGE="de"
+OCO_MESSAGE_TEMPLATE_PLACEHOLDER="$m"
+OCO_PROMPT_MODULE="@commitlint"
+OCO_AI_PROVIDER="ollama"
+OCO_GITPUSH="false"
+OCO_ONE_LINE_COMMIT="true"
+    `
+    );
+    const config = getConfig({ configPath: '', envPath: envFile.filePath });
+
+    expect(config).not.toEqual(null);
+    expect(config!['OCO_OPENAI_API_KEY']).toEqual('sk-key');
+    expect(config!['OCO_ANTHROPIC_API_KEY']).toEqual('secret-key');
+    expect(config!['OCO_TOKENS_MAX_INPUT']).toEqual(8192);
+    expect(config!['OCO_TOKENS_MAX_OUTPUT']).toEqual(1000);
+    expect(config!['OCO_OPENAI_BASE_PATH']).toEqual('/openai/api');
+    expect(config!['OCO_DESCRIPTION']).toEqual(true);
+    expect(config!['OCO_EMOJI']).toEqual(true);
+    expect(config!['OCO_MODEL']).toEqual('gpt-4');
+    expect(config!['OCO_LANGUAGE']).toEqual('de');
+    expect(config!['OCO_MESSAGE_TEMPLATE_PLACEHOLDER']).toEqual('$m');
+    expect(config!['OCO_PROMPT_MODULE']).toEqual('@commitlint');
+    expect(config!['OCO_AI_PROVIDER']).toEqual('ollama');
+    expect(config!['OCO_GITPUSH']).toEqual(false);
+    expect(config!['OCO_ONE_LINE_COMMIT']).toEqual(true);
+
+    await envFile.cleanup();
+  });
+});
diff --git a/test/unit/utils.ts b/test/unit/utils.ts
new file mode 100644
index 00000000..14433442
--- /dev/null
+++ b/test/unit/utils.ts
@@ -0,0 +1,29 @@
+import path from 'path';
+import { mkdtemp, rm, writeFile } from 'fs';
+import { promisify } from 'util';
+import { tmpdir } from 'os';
+const fsMakeTempDir = promisify(mkdtemp);
+const fsRemove = promisify(rm);
+const fsWriteFile = promisify(writeFile);
+
+/**
+ * Prepare tmp file for the test
+ */
+export async function prepareFile(
+  fileName: string,
+  content: string
+): Promise<{
+  filePath: string;
+  cleanup: () => Promise<void>;
+}> {
+  const tempDir = await fsMakeTempDir(path.join(tmpdir(), 'opencommit-test-'));
+  const filePath = path.resolve(tempDir, fileName);
+  await fsWriteFile(filePath, content);
+  const cleanup = async () => {
+    return fsRemove(tempDir, { recursive: true });
+  };
+  return {
+    filePath,
+    cleanup
+  };
+}