diff --git a/components/__tests__/AreaInput-test.tsx b/components/__tests__/AreaInput-test.tsx
new file mode 100644
index 0000000..c7418c1
--- /dev/null
+++ b/components/__tests__/AreaInput-test.tsx
@@ -0,0 +1,23 @@
+import React from 'react';
+import { render, fireEvent } from '@testing-library/react-native';
+import { AreaInput } from '../AreaInput';
+
+describe('AreaInput', () => {
+  it('renders correctly', () => {
+    const { getByPlaceholderText } = render(<AreaInput units="foot" />);
+    const lengthInput = getByPlaceholderText('Length');
+    const widthInput = getByPlaceholderText('Width');
+    expect(lengthInput).toBeTruthy();
+    expect(widthInput).toBeTruthy();
+  });
+
+  it('calls onValueSet when a value is entered', () => {
+    const onValueSetMock = jest.fn();
+    const { getByPlaceholderText } = render(
+      <AreaInput units="foot" onValueSet={onValueSetMock} />
+    );
+    const lengthInput = getByPlaceholderText('Length');
+    fireEvent.changeText(lengthInput, '10');
+    expect(onValueSetMock).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/components/__tests__/MeasurementInput-test.tsx b/components/__tests__/MeasurementInput-test.tsx
new file mode 100644
index 0000000..a69ce1a
--- /dev/null
+++ b/components/__tests__/MeasurementInput-test.tsx
@@ -0,0 +1,18 @@
+import { render, fireEvent } from '@testing-library/react-native';
+import { MeasurementInput } from '../MeasurementInput';
+
+describe('MeasurementInput', () => {
+  it('renders correctly', () => {
+    const { getByPlaceholderText } = render(<MeasurementInput units="foot" defaultValue={10} />);
+    const input = getByPlaceholderText('Enter measurement');
+    expect(input).toBeTruthy();
+  });
+
+  it('calls onValueSet when value is changed', () => {
+    const mockOnValueSet = jest.fn();
+    const { getByPlaceholderText } = render(<MeasurementInput units="foot" defaultValue={10} onValueSet={mockOnValueSet} />);
+    const input = getByPlaceholderText('Enter measurement');
+    fireEvent.changeText(input, '20');
+    expect(mockOnValueSet).toHaveBeenCalledWith({ l: 20, u: 'foot' });
+  });
+});
diff --git a/components/__tests__/ProductCalculatorSelector-test.tsx b/components/__tests__/ProductCalculatorSelector-test.tsx
new file mode 100644
index 0000000..06248f4
--- /dev/null
+++ b/components/__tests__/ProductCalculatorSelector-test.tsx
@@ -0,0 +1,42 @@
+import React from 'react';
+import { render, fireEvent } from '@testing-library/react-native';
+import { Provider } from 'react-redux';
+import { store } from '@/app/store';
+import ProductCalculatorSelector from '@/components/ProductCalculatorSelector';
+
+describe('ProductCalculatorSelector', () => {
+  it('renders correctly', () => {
+    const { getByText } = render(
+      <Provider store={store}>
+        <ProductCalculatorSelector />
+      </Provider>
+    );
+
+    expect(getByText('Please select a product')).toBeTruthy();
+  });
+
+  it('updates price when measurement is set', () => {
+    const { getByTestId, getByText } = render(
+      <Provider store={store}>
+        <ProductCalculatorSelector />
+      </Provider>
+    );
+
+    // Assume there is a product with a priceFor function that returns 100
+    const product = {
+      priceFor: jest.fn().mockReturnValue(100),
+    };
+
+    // Assume there are units for measurement
+    const units = ['cm', 'in'];
+
+    // Assume there is a measurement input
+    const measurementInput = getByTestId('measurement-input');
+
+    // Simulate user input
+    fireEvent.changeText(measurementInput, '10');
+
+    // Check if the price has been updated
+    expect(getByText('Price: 100')).toBeTruthy();
+  });
+});
diff --git a/components/__tests__/UnitChooser-test.tsx b/components/__tests__/UnitChooser-test.tsx
new file mode 100644
index 0000000..8be883a
--- /dev/null
+++ b/components/__tests__/UnitChooser-test.tsx
@@ -0,0 +1,29 @@
+import React from 'react';
+import { render, fireEvent } from '@testing-library/react-native';
+import UnitChooser from "../UnitChooser";
+import { Length } from 'safe-units';
+
+describe('UnitChooser', () => {
+  const mockOnChoicePressed = jest.fn();
+  const choices = ['foot', 'inch'] as Length [];
+
+  it('renders correctly', () => {
+    const { getByText } = render(
+      <UnitChooser choices={choices} onChoicePressed={mockOnChoicePressed} />
+    );
+
+    choices.forEach(choice => {
+      expect(getByText(choice)).toBeTruthy();
+    });
+  });
+
+  it('calls onChoicePressed when a button is pressed', () => {
+    const { getByText } = render(
+      <UnitChooser choices={choices} onChoicePressed={mockOnChoicePressed} />
+    );
+
+    fireEvent.press(getByText(choices[0]));
+
+    expect(mockOnChoicePressed).toHaveBeenCalledWith(choices[0]);
+  });
+});