diff --git a/src/tests/configuration/dynamic-config-poller.test.ts b/src/tests/configuration/dynamic-config-poller.test.ts
new file mode 100644
index 0000000..440a997
--- /dev/null
+++ b/src/tests/configuration/dynamic-config-poller.test.ts
@@ -0,0 +1,186 @@
+/* eslint-disable global-require */
+import {AppContext} from '../../lib/context';
+import {Dict} from '../../types';
+
+const MOCK_INTERVAL = 100;
+
+jest.useFakeTimers({legacyFakeTimers: true});
+
+jest.mock('axios', () => ({
+    __esModule: true,
+    default: {
+        get: jest
+            .fn()
+            .mockImplementation(
+                () =>
+                    new Promise((resolve) =>
+                        setTimeout(
+                            () =>
+                                resolve({
+                                    data: {
+                                        gravity: 9.81,
+                                    },
+                                }),
+                            1,
+                        ),
+                    ),
+            )
+            .mockImplementationOnce(
+                () =>
+                    new Promise((_resolve, reject) =>
+                        setTimeout(() => reject('URL did not respond'), 1),
+                    ),
+            )
+            .mockImplementationOnce(
+                () =>
+                    new Promise((_resolve, reject) =>
+                        setTimeout(() => reject('axios timeout'), 100),
+                    ),
+            )
+            .mockImplementationOnce(
+                () =>
+                    new Promise((resolve) =>
+                        setTimeout(
+                            () =>
+                                resolve({
+                                    data: {
+                                        gravity: 9.81,
+                                    },
+                                }),
+                            1,
+                        ),
+                    ),
+            )
+            .mockImplementationOnce(
+                () =>
+                    new Promise((_resolve, reject) =>
+                        setTimeout(() => reject('axios timeout'), 100),
+                    ),
+            ),
+    },
+}));
+
+function logNothing(_message: string, _extra?: Dict) {}
+
+const createMockAppContext = () => {
+    const mockCtx = new (AppContext as new (name: string, config: Object) => AppContext)('test', {
+        parentContext: false,
+        config: {},
+        logger: {},
+        utils: {},
+        tracer: {},
+    }) as jest.Mocked<AppContext>;
+    mockCtx.log = jest.fn().mockImplementation(logNothing);
+    mockCtx.logError = jest.fn().mockImplementation(logNothing);
+    return mockCtx;
+};
+
+const mockAppContext = createMockAppContext();
+
+const spyOnLog = jest.spyOn(mockAppContext, 'log');
+const spyOnLogError = jest.spyOn(mockAppContext, 'logError');
+
+const proceedWithTicksAndTimers = async (iterations: number, interval: number = MOCK_INTERVAL) => {
+    for (let i = 0; i < iterations; i++) {
+        jest.advanceTimersByTime(interval);
+        await new Promise(process.nextTick);
+    }
+};
+
+const MOCK_DYNAMIC_CONFIG = {
+    url: 'mockUrl',
+    interval: MOCK_INTERVAL,
+};
+
+const baseEnv = process.env;
+
+beforeEach(() => {
+    jest.clearAllMocks();
+    jest.resetModules();
+    process.env = {...baseEnv};
+});
+
+afterEach(() => {
+    process.env = baseEnv;
+});
+
+test('check if we successfully set ctx.dynamicConfig after several error calls', async () => {
+    //ARRANGE
+    const {DynamicConfigPoller} = require('../../lib/dynamic-config-poller');
+    const poller = new DynamicConfigPoller(mockAppContext, 'testPoller', MOCK_DYNAMIC_CONFIG);
+    //ACT
+    poller.startPolling();
+    const POLLING_CALLS = 3;
+    const SUCCESS_CALLS = 1;
+    const ERROR_CALLS = 2;
+    // we subtract 1 because we dont't care if our poller move to startPolling again after onSuccess in this test
+    await proceedWithTicksAndTimers(POLLING_CALLS + SUCCESS_CALLS + ERROR_CALLS - 1);
+    //ASSERT
+    expect(
+        (mockAppContext.dynamicConfig as Record<string, {gravity: number}>).testPoller.gravity,
+    ).toEqual(9.81);
+});
+
+test('check if we do not rewrite already set ctx.dynamicConfig after error call', async () => {
+    //ARRANGE
+    const {DynamicConfigPoller} = require('../../lib/dynamic-config-poller');
+    const poller = new DynamicConfigPoller(mockAppContext, 'testPoller', MOCK_DYNAMIC_CONFIG);
+    //ACT
+    poller.startPolling();
+    const POLLING_CALLS = 4;
+    const SUCCESS_CALLS = 1;
+    const ERROR_CALLS = 3;
+    await proceedWithTicksAndTimers(POLLING_CALLS + SUCCESS_CALLS + ERROR_CALLS);
+    //ASSERT
+    expect(
+        (mockAppContext.dynamicConfig as Record<string, {gravity: number}>).testPoller.gravity,
+    ).toEqual(9.81);
+});
+
+test('check if we continue to poll for config after success', async () => {
+    //ARRANGE
+    const {DynamicConfigPoller} = require('../../lib/dynamic-config-poller');
+    const poller = new DynamicConfigPoller(mockAppContext, 'testPoller', MOCK_DYNAMIC_CONFIG);
+    const spyOnStartPolling = jest.spyOn(poller, 'startPolling');
+    //ACT
+    poller.startPolling();
+    const POLLING_CALLS = 4;
+    const SUCCESS_CALLS = 1;
+    const ERROR_CALLS = 2;
+    await proceedWithTicksAndTimers(POLLING_CALLS + SUCCESS_CALLS + ERROR_CALLS);
+    //ASSERT
+    expect(spyOnStartPolling).toHaveBeenCalledTimes(POLLING_CALLS);
+});
+
+test('check if we log stuff with APP_DEBUG_DYNAMIC_CONFIG=debug', async () => {
+    //ARRANGE
+    process.env.APP_DEBUG_DYNAMIC_CONFIG = 'debug';
+    const {DynamicConfigPoller} = require('../../lib/dynamic-config-poller');
+    const poller = new DynamicConfigPoller(mockAppContext, 'testPoller', MOCK_DYNAMIC_CONFIG);
+    //ACT
+    poller.startPolling();
+    const POLLING_CALLS = 3;
+    const SUCCESS_CALLS = 1;
+    const ERROR_CALLS = 2;
+    // we subtract 1 because we dont't care if our poller move to startPolling again after onSuccess in this test
+    await proceedWithTicksAndTimers(POLLING_CALLS + SUCCESS_CALLS + ERROR_CALLS - 1);
+    //ASSERT
+    expect(spyOnLog).toHaveBeenCalledTimes(POLLING_CALLS + SUCCESS_CALLS);
+    expect(spyOnLogError).toHaveBeenCalledTimes(ERROR_CALLS);
+});
+
+test('check if we do not log stuff without APP_DEBUG_DYNAMIC_CONFIG flag', async () => {
+    //ARRANGE
+    const {DynamicConfigPoller} = require('../../lib/dynamic-config-poller');
+    const poller = new DynamicConfigPoller(mockAppContext, 'testPoller', MOCK_DYNAMIC_CONFIG);
+    //ACT
+    poller.startPolling();
+    const POLLING_CALLS = 3;
+    const SUCCESS_CALLS = 1;
+    const ERROR_CALLS = 2;
+    // we subtract 1 because we dont't care if our poller move to startPolling again after onSuccess in this test
+    await proceedWithTicksAndTimers(POLLING_CALLS + SUCCESS_CALLS + ERROR_CALLS - 1);
+    //ASSERT
+    expect(spyOnLog).not.toBeCalled();
+    expect(spyOnLogError).toHaveBeenCalledTimes(ERROR_CALLS);
+});
diff --git a/src/tests/configuration/file-configs.test.ts b/src/tests/configuration/file-configs.test.ts
new file mode 100644
index 0000000..6123900
--- /dev/null
+++ b/src/tests/configuration/file-configs.test.ts
@@ -0,0 +1,156 @@
+import path from 'path';
+
+import {loadFileConfigs} from '../../lib/file-configs';
+
+const TEST_MOCK_CONFIG = {
+    common: {
+        athmosphere: true,
+        gravity: 9.81,
+    },
+    mars: {
+        common: {
+            gravity: 3.71,
+        },
+        test: {
+            surface: 'marshmallow',
+            gravity: 1.23,
+        },
+        production: {
+            surface: 'sand',
+        },
+    },
+    venus: {
+        common: {
+            gravity: 8.87,
+        },
+        test: {
+            surface: 'nougat',
+            gravity: 4.56,
+        },
+        production: {
+            surface: 'stone',
+        },
+    },
+} as Record<string, Record<string, unknown>>;
+
+const MOCK_CONFIG_PATH = './mockConfigs';
+
+jest.doMock(path.resolve(MOCK_CONFIG_PATH, `common`), () => TEST_MOCK_CONFIG.common, {
+    virtual: true,
+});
+
+['mars', 'venus'].forEach((installation) =>
+    ['common', 'test', 'production'].forEach((environment) =>
+        jest.doMock(
+            path.resolve(MOCK_CONFIG_PATH, `${installation}/${environment}`),
+            () => TEST_MOCK_CONFIG[installation][environment],
+            {virtual: true},
+        ),
+    ),
+);
+
+test('check if we load right common config by default', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs');
+    //ASSERT
+    expect(gravity).toEqual(9.81);
+});
+
+test('check if we load specific common config without env', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'mars');
+    //ASSERT
+    expect(gravity).toEqual(3.71);
+});
+
+test('check if we load default common config if we messed with installation parameter', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'phaeton', 'test');
+    //ASSERT
+    expect(gravity).toEqual(9.81);
+});
+
+test('check if we load specific common config if we messed with env parameter', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'mars', 'model');
+    //ASSERT
+    expect(gravity).toEqual(3.71);
+});
+
+test('check if we do not overwrite existing parameters with non existing ones', () => {
+    //ARRANGE
+    //ACT
+    const {athmosphere} = loadFileConfigs('./mockConfigs', 'mars', 'test');
+    //ASSERT
+    expect(athmosphere).toEqual(true);
+});
+
+test('check if we correctly overwrite existing parameters', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'mars', 'production');
+    //ASSERT
+    expect(gravity).toEqual(3.71);
+});
+
+test('check if we correctly load existing parameters from specific configs', () => {
+    //ARRANGE
+    //ACT
+    const {surface} = loadFileConfigs('./mockConfigs', 'mars', 'test');
+    //ASSERT
+    expect(surface).toEqual('marshmallow');
+});
+
+test('check if we load different configs for different envs', () => {
+    //ARRANGE
+    //ACT
+    const {surface: testSurface} = loadFileConfigs('./mockConfigs', 'mars', 'test');
+    const {surface: productionSurface} = loadFileConfigs('./mockConfigs', 'mars', 'production');
+    //ASSERT
+    expect(testSurface === productionSurface).toEqual(false);
+});
+
+test('check if we load different configs for different installations', () => {
+    //ARRANGE
+    //ACT
+    const {gravity: marsSurface} = loadFileConfigs('./mockConfigs', 'mars', 'production');
+    const {gravity: venusSurface} = loadFileConfigs('./mockConfigs', 'venus', 'production');
+    //ASSERT
+    expect(marsSurface === venusSurface).toEqual(false);
+});
+
+test('check if we load specific common config if env and installation parameters are OK', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'mars', 'test');
+    //ASSERT
+    expect(gravity).toEqual(1.23);
+});
+
+test('check if we load default common config if we messed with env and installation parameters order', () => {
+    //ARRANGE
+    //ACT
+    const {gravity} = loadFileConfigs('./mockConfigs', 'test', 'mars');
+    //ASSERT
+    expect(gravity).toEqual(9.81);
+});
+
+test('check if we load empty config if we messed with configs path', () => {
+    //ARRANGE
+    //ACT
+    const config = loadFileConfigs('./noConfigs', 'mars', 'test');
+    //ASSERT
+    expect(Object.keys(config).length).toEqual(0);
+});
+
+test('check if we load empty config if we skip configs path', () => {
+    //ARRANGE
+    //ACT
+    const config = loadFileConfigs();
+    //ASSERT
+    expect(Object.keys(config).length).toEqual(0);
+});