Add tests for settings redux module

src/redux/modules/settings.js

@@ -19,7 +19,10 @@ const initialState = {
   passcodeHash: null,
 };
 
-const requirePasscode = (state = initialState.requirePasscode, action) => {
+export const requirePasscode = (
+  state = initialState.requirePasscode,
+  action
+) => {
   switch (action.type) {
     case TOGGLE_PASSCODE_REQUIREMENT:
       return !state;
@@ -30,7 +33,7 @@ const requirePasscode = (state = initialState.requirePasscode, action) => {
   }
 };
 
-const passcodeHash = (state = initialState.passcodeHash, action) => {
+export const passcodeHash = (state = initialState.passcodeHash, action) => {
   switch (action.type) {
     case SET_PASSCODE:
       return action.passcodeHash;

src/redux/modules/settings.test.js

@@ -0,0 +1,51 @@
+import {
+  requirePasscode as requirePasscodeReducer,
+  passcodeHash as passcodeHashReducer,
+  togglePasscodeRequirement,
+  resetPasscodeSettings,
+  setPasscode,
+} from './settings';
+
+describe('settings modules test', () => {
+  describe('requirePasscode reducer test', () => {
+    it('should return the initial state', () => {
+      expect(requirePasscodeReducer(undefined, {})).toEqual(false);
+    });
+
+    it('should set the requirement to false if previously true', () => {
+      expect(requirePasscodeReducer(true, togglePasscodeRequirement())).toEqual(
+        false
+      );
+    });
+
+    it('should set the requirement to true if previously false', () => {
+      expect(
+        requirePasscodeReducer(false, togglePasscodeRequirement())
+      ).toEqual(true);
+    });
+
+    it('should reset the requirement correctly (reset to initial state)', () => {
+      expect(requirePasscodeReducer(true, resetPasscodeSettings())).toEqual(
+        false
+      );
+    });
+  });
+
+  describe('passcodeHash reducer test', () => {
+    it('should return the initial state', () => {
+      expect(passcodeHashReducer(undefined, {})).toEqual(null);
+    });
+
+    it('should set the hash correctly', () => {
+      expect(
+        passcodeHashReducer(undefined, setPasscode('HASH HASH BABY'))
+      ).toEqual('HASH HASH BABY');
+    });
+
+    it('should reset passcode hash correctly (reset to initial state)', () => {
+      expect(
+        passcodeHashReducer('HASH HASH BABY', resetPasscodeSettings())
+      ).toEqual(null);
+    });
+  });
+});