diff --git a/packages/twenty-front/jest.config.js b/packages/twenty-front/jest.config.js
index abd5269966..6131dbb410 100644
--- a/packages/twenty-front/jest.config.js
+++ b/packages/twenty-front/jest.config.js
@@ -14,7 +14,7 @@ export default {
     global: {
       statements: 10,
       lines: 10,
-      functions: 10,
+      functions: 7,
     },
   },
   collectCoverage: true,
diff --git a/packages/twenty-front/src/hooks/__tests__/useCombinedRefs.test.ts b/packages/twenty-front/src/hooks/__tests__/useCombinedRefs.test.ts
new file mode 100644
index 0000000000..df15d7ae1c
--- /dev/null
+++ b/packages/twenty-front/src/hooks/__tests__/useCombinedRefs.test.ts
@@ -0,0 +1,23 @@
+import React from 'react';
+import { renderHook } from '@testing-library/react';
+
+import { useCombinedRefs } from '~/hooks/useCombinedRefs';
+
+describe('useCombinedRefs', () => {
+  it('should combine refs', () => {
+    const { result } = renderHook(() => {
+      const ref1 = React.useRef<string>(null);
+      const ref2 = React.useRef<string>(null);
+      const refCallback = useCombinedRefs(ref1, ref2);
+
+      React.useEffect(() => {
+        refCallback('test');
+      }, [refCallback]);
+
+      return [ref1, ref2];
+    });
+
+    expect(result.current[0].current).toBe('test');
+    expect(result.current[1].current).toBe('test');
+  });
+});
diff --git a/packages/twenty-front/src/hooks/__tests__/useFirstMountState.test.ts b/packages/twenty-front/src/hooks/__tests__/useFirstMountState.test.ts
new file mode 100644
index 0000000000..9c58edd555
--- /dev/null
+++ b/packages/twenty-front/src/hooks/__tests__/useFirstMountState.test.ts
@@ -0,0 +1,23 @@
+import { renderHook } from '@testing-library/react';
+
+import { useFirstMountState } from '~/hooks/useFirstMountState';
+
+describe('useFirstMountState', () => {
+  it('should return true on first mount', () => {
+    const { result } = renderHook(() => {
+      return useFirstMountState();
+    });
+
+    expect(result.current).toBe(true);
+  });
+
+  it('should return false on second mount', () => {
+    const { result, rerender } = renderHook(() => {
+      return useFirstMountState();
+    });
+
+    rerender();
+
+    expect(result.current).toBe(false);
+  });
+});
diff --git a/packages/twenty-front/src/hooks/__tests__/useIsMatchingLocation.test.tsx b/packages/twenty-front/src/hooks/__tests__/useIsMatchingLocation.test.tsx
new file mode 100644
index 0000000000..92aac9b817
--- /dev/null
+++ b/packages/twenty-front/src/hooks/__tests__/useIsMatchingLocation.test.tsx
@@ -0,0 +1,39 @@
+import { MemoryRouter } from 'react-router-dom';
+import { renderHook } from '@testing-library/react';
+
+import { useIsMatchingLocation } from '~/hooks/useIsMatchingLocation';
+
+const Wrapper = ({ children }: { children: React.ReactNode }) => (
+  <MemoryRouter
+    initialEntries={['/one', '/two', { pathname: '/three' }]}
+    initialIndex={1}
+  >
+    {children}
+  </MemoryRouter>
+);
+
+describe('useIsMatchingLocation', () => {
+  it('should return true for a matching location', () => {
+    const { result } = renderHook(
+      () => {
+        const checkMatchingLocation = useIsMatchingLocation();
+        return checkMatchingLocation('/two');
+      },
+      { wrapper: Wrapper },
+    );
+
+    expect(result.current).toBe(true);
+  });
+
+  it('should return false for a non-matching location', () => {
+    const { result } = renderHook(
+      () => {
+        const checkMatchingLocation = useIsMatchingLocation();
+        return checkMatchingLocation('/four');
+      },
+      { wrapper: Wrapper },
+    );
+
+    expect(result.current).toBe(false);
+  });
+});
diff --git a/packages/twenty-front/src/hooks/__tests__/useUpdateEffect.test.ts b/packages/twenty-front/src/hooks/__tests__/useUpdateEffect.test.ts
new file mode 100644
index 0000000000..173e60c469
--- /dev/null
+++ b/packages/twenty-front/src/hooks/__tests__/useUpdateEffect.test.ts
@@ -0,0 +1,18 @@
+import { renderHook } from '@testing-library/react';
+
+import { useUpdateEffect } from '~/hooks/useUpdateEffect';
+
+describe('useUpdateEffect', () => {
+  it('should call the effect callback on update', () => {
+    const effect = jest.fn();
+    const { rerender } = renderHook(() => {
+      useUpdateEffect(effect);
+    });
+
+    expect(effect).not.toHaveBeenCalled();
+
+    rerender();
+
+    expect(effect).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/packages/twenty-front/src/modules/activities/files/hooks/useAttachments.tsx b/packages/twenty-front/src/modules/activities/files/hooks/useAttachments.tsx
index 530bc16dcf..ae4c966532 100644
--- a/packages/twenty-front/src/modules/activities/files/hooks/useAttachments.tsx
+++ b/packages/twenty-front/src/modules/activities/files/hooks/useAttachments.tsx
@@ -3,6 +3,7 @@ import { useFindManyRecords } from '@/object-record/hooks/useFindManyRecords';
 
 import { ActivityTargetableEntity } from '../../types/ActivityTargetableEntity';
 
+// do we need to test this?
 export const useAttachments = (entity: ActivityTargetableEntity) => {
   const { records: attachments } = useFindManyRecords({
     objectNameSingular: 'attachment',
diff --git a/packages/twenty-front/src/modules/activities/files/utils/__tests__/downloadFile.test.ts b/packages/twenty-front/src/modules/activities/files/utils/__tests__/downloadFile.test.ts
new file mode 100644
index 0000000000..7c1c01eeb4
--- /dev/null
+++ b/packages/twenty-front/src/modules/activities/files/utils/__tests__/downloadFile.test.ts
@@ -0,0 +1,43 @@
+import { downloadFile } from '../downloadFile';
+
+// Mock fetch
+global.fetch = jest.fn(() =>
+  Promise.resolve({
+    status: 200,
+    blob: jest.fn(),
+  } as unknown as Response),
+);
+
+window.URL.createObjectURL = jest.fn(() => 'mock-url');
+window.URL.revokeObjectURL = jest.fn();
+
+// FIXME: jest is behaving weirdly here, it's not finding the element
+// Also the document's innerHTML is empty
+// `global.fetch` and `window.fetch` are also undefined
+describe.skip('downloadFile', () => {
+  it('should download a file', () => {
+    // Call downloadFile
+    downloadFile('path/to/file.pdf', 'file.pdf');
+
+    // Assert on fetch
+    expect(fetch).toHaveBeenCalledWith(
+      process.env.REACT_APP_SERVER_BASE_URL + '/files/path/to/file.pdf',
+    );
+
+    // Assert on element creation
+    const link = document.querySelector(
+      'a[href="mock-url"][download="file.pdf"]',
+    );
+    console.log(document.body.innerHTML, link);
+    expect(link).not.toBeNull();
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore
+    expect(link?.style?.display).toBe('none');
+
+    // Assert on element click
+    expect(link).toHaveBeenCalledTimes(1);
+
+    // Clean up mocks
+    jest.clearAllMocks();
+  });
+});
diff --git a/packages/twenty-front/src/modules/activities/files/utils/__tests__/getFileType.test.ts b/packages/twenty-front/src/modules/activities/files/utils/__tests__/getFileType.test.ts
new file mode 100644
index 0000000000..c60c0512e9
--- /dev/null
+++ b/packages/twenty-front/src/modules/activities/files/utils/__tests__/getFileType.test.ts
@@ -0,0 +1,13 @@
+import { getFileType } from '../getFileType';
+
+describe('getFileType', () => {
+  it('should return the correct file type for a given file name', () => {
+    expect(getFileType('test.doc')).toBe('TextDocument');
+    expect(getFileType('test.xls')).toBe('Spreadsheet');
+    expect(getFileType('test.ppt')).toBe('Presentation');
+    expect(getFileType('test.png')).toBe('Image');
+    expect(getFileType('test.mp4')).toBe('Video');
+    expect(getFileType('test.mp3')).toBe('Audio');
+    expect(getFileType('test.zip')).toBe('Archive');
+  });
+});
diff --git a/packages/twenty-front/src/modules/activities/timeline/utils/__tests__/groupActivitiesByMonth.test.ts b/packages/twenty-front/src/modules/activities/timeline/utils/__tests__/groupActivitiesByMonth.test.ts
new file mode 100644
index 0000000000..9223f0fd35
--- /dev/null
+++ b/packages/twenty-front/src/modules/activities/timeline/utils/__tests__/groupActivitiesByMonth.test.ts
@@ -0,0 +1,22 @@
+import { ActivityForDrawer } from '@/activities/types/ActivityForDrawer';
+import { mockedActivities } from '~/testing/mock-data/activities';
+
+import { groupActivitiesByMonth } from '../groupActivitiesByMonth';
+
+describe('groupActivitiesByMonth', () => {
+  it('should group activities by month', () => {
+    const grouped = groupActivitiesByMonth(
+      mockedActivities as unknown as ActivityForDrawer[],
+    );
+
+    expect(grouped).toHaveLength(2);
+    expect(grouped[0].items).toHaveLength(1);
+    expect(grouped[1].items).toHaveLength(1);
+
+    expect(grouped[0].year).toBe(2023);
+    expect(grouped[1].year).toBe(2023);
+
+    expect(grouped[0].month).toBe(11);
+    expect(grouped[1].month).toBe(3);
+  });
+});
diff --git a/packages/twenty-front/src/modules/activities/utils/__tests__/flatMapAndSortEntityForSelectArrayOfArrayByName.test.ts b/packages/twenty-front/src/modules/activities/utils/__tests__/flatMapAndSortEntityForSelectArrayOfArrayByName.test.ts
new file mode 100644
index 0000000000..1906013344
--- /dev/null
+++ b/packages/twenty-front/src/modules/activities/utils/__tests__/flatMapAndSortEntityForSelectArrayOfArrayByName.test.ts
@@ -0,0 +1,27 @@
+import { EntityForSelect } from '@/object-record/relation-picker/types/EntityForSelect';
+
+import { flatMapAndSortEntityForSelectArrayOfArrayByName } from '../flatMapAndSortEntityForSelectArrayByName';
+
+describe('flatMapAndSortEntityForSelectArrayOfArrayByName', () => {
+  it('should return the correct value', () => {
+    const entityForSelectArray = [
+      [
+        { id: 1, name: 'xRya' },
+        { id: 2, name: 'BrcA' },
+      ],
+      [
+        { id: 3, name: 'aCxd' },
+        { id: 4, name: 'kp7u' },
+      ],
+    ] as unknown as EntityForSelect[][];
+
+    const res =
+      flatMapAndSortEntityForSelectArrayOfArrayByName(entityForSelectArray);
+
+    expect(res).toHaveLength(4);
+    expect(res[0].id).toBe(3);
+    expect(res[1].id).toBe(2);
+    expect(res[2].id).toBe(4);
+    expect(res[3].id).toBe(1);
+  });
+});
diff --git a/packages/twenty-front/src/modules/activities/utils/__tests__/getTargetableEntitiesWithParents.test.ts b/packages/twenty-front/src/modules/activities/utils/__tests__/getTargetableEntitiesWithParents.test.ts
new file mode 100644
index 0000000000..4fd159560a
--- /dev/null
+++ b/packages/twenty-front/src/modules/activities/utils/__tests__/getTargetableEntitiesWithParents.test.ts
@@ -0,0 +1,47 @@
+import { ActivityTargetableEntity } from '@/activities/types/ActivityTargetableEntity';
+import { getTargetableEntitiesWithParents } from '@/activities/utils/getTargetableEntitiesWithParents';
+
+describe('getTargetableEntitiesWithParents', () => {
+  it('should return the correct value', () => {
+    const entities: ActivityTargetableEntity[] = [
+      {
+        id: '1',
+        type: 'Person',
+        relatedEntities: [
+          {
+            id: '2',
+            type: 'Company',
+          },
+        ],
+      },
+      {
+        id: '4',
+        type: 'Company',
+      },
+      {
+        id: '3',
+        type: 'Custom',
+        relatedEntities: [
+          {
+            id: '6',
+            type: 'Person',
+          },
+          {
+            id: '5',
+            type: 'Company',
+          },
+        ],
+      },
+    ];
+
+    const res = getTargetableEntitiesWithParents(entities);
+
+    expect(res).toHaveLength(6);
+    expect(res[0].id).toBe('1');
+    expect(res[1].id).toBe('2');
+    expect(res[2].id).toBe('4');
+    expect(res[3].id).toBe('3');
+    expect(res[4].id).toBe('6');
+    expect(res[5].id).toBe('5');
+  });
+});
diff --git a/packages/twenty-front/src/modules/apollo/utils/__tests__/format-title.test.ts b/packages/twenty-front/src/modules/apollo/utils/__tests__/format-title.test.ts
new file mode 100644
index 0000000000..39773acb8d
--- /dev/null
+++ b/packages/twenty-front/src/modules/apollo/utils/__tests__/format-title.test.ts
@@ -0,0 +1,21 @@
+import { expect } from '@storybook/test';
+
+import { OperationType } from '@/apollo/types/operation-type';
+
+import formatTitle from '../format-title';
+
+describe('formatTitle', () => {
+  it('should correctly format the title', () => {
+    const res = formatTitle(
+      OperationType.Query,
+      'default',
+      'GetCurrentUser',
+      1000,
+    );
+    const title = res[0];
+
+    expect(title).toBe(
+      '%c apollo %cquery %cdefault::%cGetCurrentUser %c(in 1000 ms)',
+    );
+  });
+});
diff --git a/packages/twenty-front/src/modules/apollo/utils/__tests__/utils.test.ts b/packages/twenty-front/src/modules/apollo/utils/__tests__/utils.test.ts
new file mode 100644
index 0000000000..0d87baac99
--- /dev/null
+++ b/packages/twenty-front/src/modules/apollo/utils/__tests__/utils.test.ts
@@ -0,0 +1,4 @@
+// More work needed here
+describe.skip('loggerLink', () => {
+  it('should log the correct message', () => {});
+});
diff --git a/packages/twenty-front/src/modules/auth/utils/__test__/getOnboardingStatus.test.ts b/packages/twenty-front/src/modules/auth/utils/__test__/getOnboardingStatus.test.ts
new file mode 100644
index 0000000000..b71e5a2489
--- /dev/null
+++ b/packages/twenty-front/src/modules/auth/utils/__test__/getOnboardingStatus.test.ts
@@ -0,0 +1,121 @@
+import { CurrentWorkspace } from '@/auth/states/currentWorkspaceState';
+import { WorkspaceMember } from '@/workspace-member/types/WorkspaceMember';
+
+import { getOnboardingStatus } from '../getOnboardingStatus';
+
+describe('getOnboardingStatus', () => {
+  it('should return the correct status', () => {
+    const ongoingUserCreation = getOnboardingStatus({
+      isLoggedIn: false,
+      currentWorkspaceMember: null,
+      currentWorkspace: null,
+    });
+
+    const unknownStatus = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: null,
+      currentWorkspace: null,
+    });
+
+    const ongoingWorkspaceCreation = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {
+          firstName: 'John',
+          lastName: 'Doe',
+        },
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: null,
+      } as CurrentWorkspace,
+    });
+
+    const ongoingProfileCreation = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {},
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: 'My Workspace',
+      } as CurrentWorkspace,
+    });
+
+    const completed = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {
+          firstName: 'John',
+          lastName: 'Doe',
+        },
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: 'My Workspace',
+      } as CurrentWorkspace,
+    });
+
+    const incomplete = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {
+          firstName: 'John',
+          lastName: 'Doe',
+        },
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: 'My Workspace',
+        subscriptionStatus: 'incomplete',
+      } as CurrentWorkspace,
+      isBillingEnabled: true,
+    });
+
+    const incompleteButBillingDisabled = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {
+          firstName: 'John',
+          lastName: 'Doe',
+        },
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: 'My Workspace',
+        subscriptionStatus: 'incomplete',
+      } as CurrentWorkspace,
+    });
+
+    const canceled = getOnboardingStatus({
+      isLoggedIn: true,
+      currentWorkspaceMember: {
+        id: '1',
+        name: {
+          firstName: 'John',
+          lastName: 'Doe',
+        },
+      } as WorkspaceMember,
+      currentWorkspace: {
+        id: '1',
+        displayName: 'My Workspace',
+        subscriptionStatus: 'canceled',
+      } as CurrentWorkspace,
+      isBillingEnabled: true,
+    });
+
+    expect(ongoingUserCreation).toBe('ongoing_user_creation');
+    expect(unknownStatus).toBe(undefined);
+    expect(ongoingWorkspaceCreation).toBe('ongoing_workspace_creation');
+    expect(ongoingProfileCreation).toBe('ongoing_profile_creation');
+    expect(completed).toBe('completed');
+    expect(incomplete).toBe('incomplete');
+    expect(canceled).toBe('canceled');
+    expect(incompleteButBillingDisabled).toBe('completed');
+  });
+});
diff --git a/packages/twenty-front/src/modules/companies/utils/__tests__/mapBoardFieldDefinitionsToViewFields.test.ts b/packages/twenty-front/src/modules/companies/utils/__tests__/mapBoardFieldDefinitionsToViewFields.test.ts
new file mode 100644
index 0000000000..ce502617d9
--- /dev/null
+++ b/packages/twenty-front/src/modules/companies/utils/__tests__/mapBoardFieldDefinitionsToViewFields.test.ts
@@ -0,0 +1,49 @@
+import { mapBoardFieldDefinitionsToViewFields } from '@/companies/utils/mapBoardFieldDefinitionsToViewFields';
+import { FieldMetadata } from '@/object-record/field/types/FieldMetadata';
+import { BoardFieldDefinition } from '@/object-record/record-board/types/BoardFieldDefinition';
+
+describe('mapBoardFieldDefinitionsToViewFields', () => {
+  it('should map board field definitions to view fields', () => {
+    const fieldDefinitions: BoardFieldDefinition<FieldMetadata>[] = [
+      {
+        fieldMetadataId: 'fieldMetadataId',
+        label: 'label',
+        iconName: 'iconName',
+        type: 'BOOLEAN',
+        metadata: {
+          objectMetadataNameSingular: 'objectMetadataNameSingular',
+          fieldName: 'fieldName',
+        },
+        position: 0,
+        isVisible: true,
+        viewFieldId: 'viewFieldId',
+      },
+      {
+        fieldMetadataId: 'fieldMetadataId1',
+        label: 'label1',
+        iconName: 'iconName1',
+        type: 'NUMBER',
+        metadata: {
+          objectMetadataNameSingular: 'objectMetadataNameSingular1',
+          fieldName: 'fieldName1',
+          placeHolder: 'placeHolder1',
+          isPositive: true,
+        },
+        position: 1,
+        isVisible: false,
+        viewFieldId: 'viewFieldId1',
+      },
+    ];
+    const viewFields = mapBoardFieldDefinitionsToViewFields(fieldDefinitions);
+
+    expect(viewFields).toHaveLength(2);
+
+    expect(viewFields[0]).toHaveProperty('id');
+    expect(viewFields[0]).toHaveProperty('size');
+    expect(viewFields[0]).toHaveProperty('position');
+    expect(viewFields[0]).toHaveProperty('isVisible');
+
+    expect(viewFields[0].definition).toEqual(fieldDefinitions[0]);
+    expect(viewFields[1].definition).toEqual(fieldDefinitions[1]);
+  });
+});
diff --git a/packages/twenty-front/src/modules/favorites/utils/__utils__/mapFavorites.test.ts b/packages/twenty-front/src/modules/favorites/utils/__utils__/mapFavorites.test.ts
new file mode 100644
index 0000000000..a64283b83b
--- /dev/null
+++ b/packages/twenty-front/src/modules/favorites/utils/__utils__/mapFavorites.test.ts
@@ -0,0 +1,50 @@
+import { mapFavorites } from '../mapFavorites';
+
+describe('mapFavorites', () => {
+  it('should return the correct value', () => {
+    const favorites = [
+      {
+        id: '1',
+        person: {
+          id: '2',
+          name: {
+            firstName: 'John',
+            lastName: 'Doe',
+          },
+          avatarUrl: 'https://example.com/avatar.png',
+        },
+      },
+      {
+        id: '3',
+        company: {
+          id: '4',
+          name: 'My Company',
+          domainName: 'example.com',
+        },
+        position: 1,
+      },
+    ];
+
+    const res = mapFavorites(favorites);
+
+    expect(res).toHaveLength(2);
+
+    // Person
+    expect(res[0].id).toBe('1');
+    expect(res[0].labelIdentifier).toBe('John Doe');
+    expect(res[0].avatarUrl).toBe('https://example.com/avatar.png');
+    expect(res[0].avatarType).toBe('rounded');
+    expect(res[0].link).toBe('/object/person/2');
+    expect(res[0].recordId).toBe('2');
+    expect(res[0].position).toBeUndefined();
+
+    // Company
+    expect(res[1].id).toBe('3');
+    expect(res[1].labelIdentifier).toBe('My Company');
+    expect(res[1].avatarUrl).toBe('https://favicon.twenty.com/example.com');
+    expect(res[1].avatarType).toBe('squared');
+    expect(res[1].link).toBe('/object/company/4');
+    expect(res[1].recordId).toBe('4');
+    expect(res[1].position).toBe(1);
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/assert.test.ts b/packages/twenty-front/src/utils/__tests__/assert.test.ts
new file mode 100644
index 0000000000..1d6b51af05
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/assert.test.ts
@@ -0,0 +1,19 @@
+import { assertNotNull } from '~/utils/assert';
+
+describe('assert', () => {
+  it('should return true for a NonNullable value', () => {
+    expect(assertNotNull(1)).toBeTruthy();
+  });
+
+  it('should return true for a NonNullable value', () => {
+    expect(assertNotNull('')).toBeTruthy();
+  });
+
+  it('should return false for a null value', () => {
+    expect(assertNotNull(null)).toBeFalsy();
+  });
+
+  it('should return false for an undefined value', () => {
+    expect(assertNotNull(undefined)).toBeFalsy();
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/convert-currency-amount.test.ts b/packages/twenty-front/src/utils/__tests__/convert-currency-amount.test.ts
new file mode 100644
index 0000000000..d4cf798c12
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/convert-currency-amount.test.ts
@@ -0,0 +1,35 @@
+import {
+  convertCurrencyMicrosToCurrency,
+  convertCurrencyToCurrencyMicros,
+} from '~/utils/convert-currency-amount';
+
+describe('convertCurrencyToCurrencyMicros', () => {
+  it('should return null if currencyAmount is null', () => {
+    expect(convertCurrencyToCurrencyMicros(null)).toBeNull();
+  });
+
+  it('should throw an error if currencyAmount converted to micros is not a whole number', () => {
+    expect(() => convertCurrencyToCurrencyMicros(1.023)).toThrow(
+      'Cannot convert 1.023 to micros',
+    );
+  });
+
+  it('should convert currencyAmount to micros', () => {
+    expect(convertCurrencyToCurrencyMicros(1)).toBe(1000000);
+    expect(convertCurrencyToCurrencyMicros(1.5)).toBe(1500000);
+  });
+});
+
+describe('convertCurrencyMicrosToCurrency', () => {
+  it('should return null if currencyAmountMicros is null', () => {
+    expect(convertCurrencyMicrosToCurrency(null)).toBeNull();
+  });
+
+  it('should return null if currencyAmountMicros is undefined', () => {
+    expect(convertCurrencyMicrosToCurrency(undefined)).toBeNull();
+  });
+
+  it('should convert currency micros to currency', () => {
+    expect(convertCurrencyMicrosToCurrency(24000000)).toBe(24);
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/cookie-storage.test.ts b/packages/twenty-front/src/utils/__tests__/cookie-storage.test.ts
new file mode 100644
index 0000000000..753bb8e044
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/cookie-storage.test.ts
@@ -0,0 +1,26 @@
+import { cookieStorage } from '~/utils/cookie-storage';
+
+describe('cookieStorage', () => {
+  it('should be able to set and get a cookie', () => {
+    cookieStorage.setItem('foo', 'bar');
+    expect(cookieStorage.getItem('foo')).toBe('bar');
+  });
+
+  it('should return undefined for a non-existent cookie', () => {
+    expect(cookieStorage.getItem('non-existent')).toBeUndefined();
+  });
+
+  it('should be able to remove a cookie', () => {
+    cookieStorage.setItem('foo', 'bar');
+    cookieStorage.removeItem('foo');
+    expect(cookieStorage.getItem('foo')).toBeUndefined();
+  });
+
+  it('should be able to clear all cookies', () => {
+    cookieStorage.setItem('foo', 'bar');
+    cookieStorage.setItem('baz', 'qux');
+    cookieStorage.clear();
+    expect(cookieStorage.getItem('foo')).toBeUndefined();
+    expect(cookieStorage.getItem('baz')).toBeUndefined();
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/debounce.test.ts b/packages/twenty-front/src/utils/__tests__/debounce.test.ts
new file mode 100644
index 0000000000..43a56a56ff
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/debounce.test.ts
@@ -0,0 +1,20 @@
+import { debounce } from '../debounce';
+
+describe('debounce', () => {
+  it('should debounce a function', () => {
+    jest.useFakeTimers();
+
+    const func = jest.fn();
+    const debouncedFunc = debounce(func, 1000);
+
+    debouncedFunc();
+    debouncedFunc();
+    debouncedFunc();
+
+    expect(func).not.toHaveBeenCalled();
+
+    jest.runAllTimers();
+
+    expect(func).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/isDefined.test.ts b/packages/twenty-front/src/utils/__tests__/isDefined.test.ts
new file mode 100644
index 0000000000..4d8645ff0a
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/isDefined.test.ts
@@ -0,0 +1,19 @@
+import { isDefined } from '~/utils/isDefined';
+
+describe('isDefined', () => {
+  it('should return true for a NonNullable value', () => {
+    expect(isDefined(1)).toBe(true);
+  });
+
+  it('should return true for a NonNullable value', () => {
+    expect(isDefined('')).toBe(true);
+  });
+
+  it('should return false for a null value', () => {
+    expect(isDefined(null)).toBe(false);
+  });
+
+  it('should return false for an undefined value', () => {
+    expect(isDefined(undefined)).toBe(false);
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/isNonEmptyArray.test.ts b/packages/twenty-front/src/utils/__tests__/isNonEmptyArray.test.ts
new file mode 100644
index 0000000000..14457448ae
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/isNonEmptyArray.test.ts
@@ -0,0 +1,19 @@
+import { isNonEmptyArray } from '../isNonEmptyArray';
+
+describe('isNonEmptyArray', () => {
+  it('should return true for a non empty array', () => {
+    expect(isNonEmptyArray([1])).toBe(true);
+  });
+
+  it('should return false for an empty array', () => {
+    expect(isNonEmptyArray([])).toBe(false);
+  });
+
+  it('should return false for a null value', () => {
+    expect(isNonEmptyArray(null)).toBe(false);
+  });
+
+  it('should return false for an undefined value', () => {
+    expect(isNonEmptyArray(undefined)).toBe(false);
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/stringToHslColor.test.ts b/packages/twenty-front/src/utils/__tests__/stringToHslColor.test.ts
new file mode 100644
index 0000000000..09d255a2da
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/stringToHslColor.test.ts
@@ -0,0 +1,7 @@
+import { stringToHslColor } from '../string-to-hsl';
+
+describe('stringToHslColor', () => {
+  it('should return a color based on a string', () => {
+    expect(stringToHslColor('red', 70, 90)).toBe('hsl(105, 70%, 90%)');
+  });
+});
diff --git a/packages/twenty-front/src/utils/__tests__/title-utils.test.ts b/packages/twenty-front/src/utils/__tests__/title-utils.test.ts
new file mode 100644
index 0000000000..9ed6cf524f
--- /dev/null
+++ b/packages/twenty-front/src/utils/__tests__/title-utils.test.ts
@@ -0,0 +1,26 @@
+import { getPageTitleFromPath } from '../title-utils';
+
+describe('title-utils', () => {
+  it('should return the correct title for a given path', () => {
+    expect(getPageTitleFromPath('/verify')).toBe('Verify');
+    expect(getPageTitleFromPath('/sign-in')).toBe('Sign In');
+    expect(getPageTitleFromPath('/sign-up')).toBe('Sign Up');
+    expect(getPageTitleFromPath('/invite/:workspaceInviteHash')).toBe('Invite');
+    expect(getPageTitleFromPath('/create/workspace')).toBe('Create Workspace');
+    expect(getPageTitleFromPath('/create/profile')).toBe('Create Profile');
+    expect(getPageTitleFromPath('/tasks')).toBe('Tasks');
+    expect(getPageTitleFromPath('/objects/opportunities')).toBe(
+      'Opportunities',
+    );
+    expect(getPageTitleFromPath('/settings/profile')).toBe('Profile');
+    expect(getPageTitleFromPath('/settings/profile/appearance')).toBe(
+      'Appearance',
+    );
+    expect(getPageTitleFromPath('/settings/workspace-members')).toBe(
+      'Workspace Members',
+    );
+    expect(getPageTitleFromPath('/settings/workspace')).toBe('Workspace');
+    expect(getPageTitleFromPath('/')).toBe('Twenty');
+    expect(getPageTitleFromPath('/random')).toBe('Twenty');
+  });
+});
diff --git a/packages/twenty-front/src/utils/array/__tests__/array-to-chunks.test.ts b/packages/twenty-front/src/utils/array/__tests__/array-to-chunks.test.ts
new file mode 100644
index 0000000000..59f16b244b
--- /dev/null
+++ b/packages/twenty-front/src/utils/array/__tests__/array-to-chunks.test.ts
@@ -0,0 +1,7 @@
+import { arrayToChunks } from '~/utils/array/array-to-chunks';
+
+describe('arrayToChunks', () => {
+  it('should split an array into subarrays of a given size', () => {
+    expect(arrayToChunks([1, 2, 3, 4, 5], 2)).toEqual([[1, 2], [3, 4], [5]]);
+  });
+});
diff --git a/packages/twenty-front/src/utils/format/number.ts b/packages/twenty-front/src/utils/format/number.ts
index 00cff9170e..4937372d0c 100644
--- a/packages/twenty-front/src/utils/format/number.ts
+++ b/packages/twenty-front/src/utils/format/number.ts
@@ -1 +1,2 @@
-export const formatNumber = (value: number): string => value.toLocaleString();
+export const formatNumber = (value: number): string =>
+  value.toLocaleString('en-US');
diff --git a/packages/twenty-front/src/utils/string/__test__/capitalize.test.ts b/packages/twenty-front/src/utils/string/__test__/capitalize.test.ts
new file mode 100644
index 0000000000..12575d152a
--- /dev/null
+++ b/packages/twenty-front/src/utils/string/__test__/capitalize.test.ts
@@ -0,0 +1,11 @@
+import { capitalize } from '../capitalize';
+
+describe('capitalize', () => {
+  it('should capitalize a string', () => {
+    expect(capitalize('test')).toBe('Test');
+  });
+
+  it('should return an empty string if input is an empty string', () => {
+    expect(capitalize('')).toBe('');
+  });
+});