diff --git a/jest.config.unit.js b/jest.config.unit.js
index 2c94f4b1b..c3f994e02 100644
--- a/jest.config.unit.js
+++ b/jest.config.unit.js
@@ -5,10 +5,16 @@
 module.exports = {
     rootDir: './',
     moduleFileExtensions: ['js'],
-    testMatch: ['**/src/js/**/*.test.(js)'],
+    testMatch: ['**/src/js/**/*.test.js'],
     testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/src/js/device/_old/'],
     coverageDirectory: './coverage/',
     collectCoverage: true,
+    collectCoverageFrom: [
+        '<rootDir>/src/js/**',
+        '!**/constants/**',
+        '!**/__tests__/**',
+        '!**/__fixtures__/**',
+    ],
     modulePathIgnorePatterns: ['node_modules'],
     setupFiles: ['./tests/jest.setup.js'],
     transform: {
diff --git a/src/js/core/methods/__fixtures__/params.js b/src/js/core/methods/__fixtures__/params.js
new file mode 100644
index 000000000..2e336907a
--- /dev/null
+++ b/src/js/core/methods/__fixtures__/params.js
@@ -0,0 +1,91 @@
+export const fixtures = {
+    applySettings: [
+        {
+            description: 'language param invalid type',
+            params: { language: 1 },
+            error: 'Parameter "language" has invalid type. "string" expected.',
+        },
+        {
+            description: 'success',
+            params: { language: 'en' },
+        },
+    ],
+    applyFlags: [
+        {
+            description: 'missing flags param',
+            params: { foo: 1 },
+            error: 'Parameter "flags" is missing.',
+        },
+        {
+            description: 'flags param invalid type',
+            params: { flags: '1' },
+            error: 'Parameter "flags" has invalid type. "number" expected.',
+        },
+        {
+            description: 'success',
+            params: { flags: 1 },
+        },
+    ],
+    backupDevice: [],
+    binanceGetAddress: [],
+    binanceGetPublicKey: [],
+    binanceSignTransaction: [],
+    blockchainDisconnect: [],
+    blockchainEstimateFee: [],
+    blockchainGetAccountBalanceHistory: [],
+    blockchainGetCurrentFiatRates: [],
+    blockchainGetFiatRatesForTimestamps: [],
+    blockchainGetTransactions: [],
+    blockchainSetCustomBackend: [],
+    blockchainSubscribe: [],
+    blockchainSubscribeFiatRates: [],
+    blockchainUnsubscribe: [],
+    blockchainUnsubscribeFiatRates: [],
+    cardanoGetAddress: [],
+    cardanoGetPublicKey: [],
+    cardanoSignTransaction: [],
+    changePin: [],
+    cipherKeyValue: [],
+    composeTransaction: [],
+    customMessage: [],
+    debugLinkDecision: [],
+    debugLinkGetState: [],
+    eosGetPublicKey: [],
+    eosSignTransaction: [],
+    ethereumGetAddress: [],
+    ethereumGetPublicKey: [],
+    ethereumSignMessage: [],
+    ethereumSignTransaction: [],
+    ethereumVerifyMessage: [],
+    firmwareUpdate: [],
+    getAccountInfo: [],
+    getAddress: [],
+    getCoinInfo: [],
+    getDeviceState: [],
+    getFeatures: [],
+    getPublicKey: [],
+    getSettings: [],
+    liskGetAddress: [],
+    liskGetPublicKey: [],
+    liskSignMessage: [],
+    liskSignTransaction: [],
+    liskVerifyMessage: [],
+    loadDevice: [],
+    nemGetAddress: [],
+    nemSignTransaction: [],
+    pushTransaction: [],
+    recoveryDevice: [],
+    requestLogin: [],
+    resetDevice: [],
+    rippleGetAddress: [],
+    rippleSignTransaction: [],
+    signMessage: [],
+    signTransaction: [],
+    stellarGetAddress: [],
+    stellarSignTransaction: [],
+    tezosGetAddress: [],
+    tezosGetPublicKey: [],
+    tezosSignTransaction: [],
+    verifyMessage: [],
+    wipeDevice: [],
+};
diff --git a/src/js/core/methods/__tests__/params.test.js b/src/js/core/methods/__tests__/params.test.js
new file mode 100644
index 000000000..bb015f75e
--- /dev/null
+++ b/src/js/core/methods/__tests__/params.test.js
@@ -0,0 +1,30 @@
+import { find } from '../index';
+import { fixtures } from '../__fixtures__/params';
+import coinsJSON from '../../../../data/coins.json';
+import { parseCoinsJson } from '../../../data/CoinInfo';
+
+describe('core/methods params validation', () => {
+    beforeAll(() => {
+        parseCoinsJson(coinsJSON);
+    });
+    Object.keys(fixtures).forEach(key => {
+        fixtures[key].forEach(f => {
+            it(`${key}: ${f.description}`, () => {
+                try {
+                    const method = find({
+                        id: 0,
+                        payload: {
+                            method: key,
+                            ...f.params,
+                        },
+                    });
+                    method.device = {
+                        unavailableCapabilities: {},
+                    };
+                } catch (error) {
+                    expect(error.message).toBe(f.error);
+                }
+            });
+        });
+    });
+});