diff --git a/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-less-than-2.e2e.test.ts b/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-less-than-2.e2e.test.ts
new file mode 100644
index 0000000..ece4f95
--- /dev/null
+++ b/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-less-than-2.e2e.test.ts
@@ -0,0 +1,31 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Session Creation', () => {
+  test('Attempt to Create Session with Invalid Number of Participants (Less than 2)', async ({ page }) => {
+    // Ensure the user is logged in and on the session creation page.
+    await page.goto('https://unisono.aglink.duckdns.org/login');
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('HonorableHumansPrivilegeIsToBeAllowedHere');
+    await page.getByRole('button', { name: 'Enter' }).click();
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // 2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+    await page.getByRole('textbox', { name: 'Topic' }).fill('Project Alpha Planning');
+
+    // 3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+    await page.getByRole('textbox', { name: 'Details (Optional)' }).fill('Discuss Q4 goals and allocate resources');
+
+    // 4. Enter "1" into the "Number of Expected Responses" spinbutton.
+    await page.getByRole('spinbutton', { name: 'Number of Expected Responses' }).fill('1');
+
+    // 5. Click the "Start Session" button.
+    await page.getByRole('button', { name: 'Start Session' }).click();
+
+    // Expected Results:
+    // - An error message indicating that the number of participants must be at least 2 is displayed.
+    await expect(page.getByText('Must be an integer between 2 and 12')).toBeVisible();
+
+    // - The session is not created, and the user remains on the session creation page.
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+    await expect(page.getByRole('heading', { name: 'Harmonize Desires' })).toBeVisible();
+  });
+});
diff --git a/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-more-than-12.e2e.test.ts b/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-more-than-12.e2e.test.ts
new file mode 100644
index 0000000..cc32d54
--- /dev/null
+++ b/tests/e2e/attempt-to-create-session-with-invalid-number-of-participants-more-than-12.e2e.test.ts
@@ -0,0 +1,31 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Session Creation', () => {
+  test('Attempt to Create Session with Invalid Number of Participants (More than 12)', async ({ page }) => {
+    // Ensure the user is logged in and on the session creation page.
+    await page.goto('https://unisono.aglink.duckdns.org/login');
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('HonorableHumansPrivilegeIsToBeAllowedHere');
+    await page.getByRole('button', { name: 'Enter' }).click();
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // 2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+    await page.getByRole('textbox', { name: 'Topic' }).fill('Project Alpha Planning');
+
+    // 3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+    await page.getByRole('textbox', { name: 'Details (Optional)' }).fill('Discuss Q4 goals and allocate resources');
+
+    // 4. Enter "13" into the "Number of Expected Responses" spinbutton.
+    await page.getByRole('spinbutton', { name: 'Number of Expected Responses' }).fill('13');
+
+    // 5. Click the "Start Session" button.
+    await page.getByRole('button', { name: 'Start Session' }).click();
+
+    // Expected Results:
+    // - An error message indicating that the number of participants cannot exceed 12 is displayed.
+    await expect(page.getByText('Must be an integer between 2 and 12')).toBeVisible();
+
+    // - The session is not created, and the user remains on the session creation page.
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+    await expect(page.getByRole('heading', { name: 'Harmonize Desires' })).toBeVisible();
+  });
+});
diff --git a/tests/e2e/attempt-to-create-session-with-missing-topic.e2e.test.ts b/tests/e2e/attempt-to-create-session-with-missing-topic.e2e.test.ts
new file mode 100644
index 0000000..443efd9
--- /dev/null
+++ b/tests/e2e/attempt-to-create-session-with-missing-topic.e2e.test.ts
@@ -0,0 +1,31 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Session Creation', () => {
+  test('Attempt to Create Session with Missing Topic', async ({ page }) => {
+    // Ensure the user is logged in and on the session creation page.
+    await page.goto('https://unisono.aglink.duckdns.org/login');
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('HonorableHumansPrivilegeIsToBeAllowedHere');
+    await page.getByRole('button', { name: 'Enter' }).click();
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // 2. Leave the "Topic" textbox empty.
+    // (This step is implicitly handled by not filling the topic field)
+
+    // 3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+    await page.getByRole('textbox', { name: 'Details (Optional)' }).fill('Discuss Q4 goals and allocate resources');
+
+    // 4. Enter a valid number of participants (e.g., "3") into the "Number of Expected Responses" spinbutton.
+    await page.getByRole('spinbutton', { name: 'Number of Expected Responses' }).fill('3');
+
+    // 5. Click the "Start Session" button.
+    await page.getByRole('button', { name: 'Start Session' }).click();
+
+    // Expected Results:
+    // - An error message indicating that the "Topic" field is required is displayed.
+    await expect(page.getByText('Topic is required')).toBeVisible();
+
+    // - The session is not created, and the user remains on the session creation page.
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+    await expect(page.getByRole('heading', { name: 'Harmonize Desires' })).toBeVisible();
+  });
+});
diff --git a/tests/e2e/create-session-with-valid-data.e2e.test.ts b/tests/e2e/create-session-with-valid-data.e2e.test.ts
new file mode 100644
index 0000000..ecb286b
--- /dev/null
+++ b/tests/e2e/create-session-with-valid-data.e2e.test.ts
@@ -0,0 +1,36 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Session Creation', () => {
+  test('Create Session with Valid Data', async ({ page }) => {
+    // Ensure the user is logged in and on the session creation page.
+    await page.goto('https://unisono.aglink.duckdns.org/login');
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('HonorableHumansPrivilegeIsToBeAllowedHere');
+    await page.getByRole('button', { name: 'Enter' }).click();
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // 2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+    await page.getByRole('textbox', { name: 'Topic' }).fill('Project Alpha Planning');
+
+    // 3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+    await page.getByRole('textbox', { name: 'Details (Optional)' }).fill('Discuss Q4 goals and allocate resources');
+
+    // 4. Enter a valid number of participants (e.g., "3") into the "Number of Expected Responses" spinbutton.
+    await page.getByRole('spinbutton', { name: 'Number of Expected Responses' }).fill('3');
+
+    // 5. Click the "Start Session" button.
+    await page.getByRole('button', { name: 'Start Session' }).click();
+
+    // Expected Results:
+    // - A new session is created.
+    // - The user is redirected to the active session page.
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // - The session details (Topic, Details, Number of Expected Responses) are displayed correctly.
+    await expect(page.getByRole('heading', { name: 'Project Alpha Planning' })).toBeVisible();
+    await expect(page.getByText('Details: Discuss Q4 goals and allocate resources')).toBeVisible();
+    await expect(page.getByText('Expected Responses: 3')).toBeVisible();
+
+    // - A "Copy Link" button is visible.
+    await expect(page.getByRole('button', { name: 'Copy Link' })).toBeVisible();
+  });
+});
diff --git a/tests/e2e/successful-login-with-valid-passphrase.e2e.test.ts b/tests/e2e/successful-login-with-valid-passphrase.e2e.test.ts
new file mode 100644
index 0000000..4a50c84
--- /dev/null
+++ b/tests/e2e/successful-login-with-valid-passphrase.e2e.test.ts
@@ -0,0 +1,27 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Authentication', () => {
+  test('Successful Login with Valid Passphrase', async ({ page }) => {
+    // 1. Navigate to the application URL
+    await page.goto('https://unisono.aglink.duckdns.org');
+
+    // 2. On the login page, enter the valid AUTH_PASSPHRASE into the "Passphrase" textbox.
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('HonorableHumansPrivilegeIsToBeAllowedHere');
+
+    // 3. Click the "Enter" button.
+    await page.getByRole('button', { name: 'Enter' }).click();
+
+    // Expected Results:
+    // - The user is redirected to a new session creation page (e.g., /session/<session-id>).
+    await expect(page).toHaveURL(/.*\/session\/.*/);
+
+    // - The "Harmonize Desires" heading is visible.
+    await expect(page.getByRole('heading', { name: 'Harmonize Desires' })).toBeVisible();
+
+    // - The session creation form (Topic, Details, Number of Expected Responses, Start Session button) is displayed.
+    await expect(page.getByRole('textbox', { name: 'Topic' })).toBeVisible();
+    await expect(page.getByRole('textbox', { name: 'Details (Optional)' })).toBeVisible();
+    await expect(page.getByRole('spinbutton', { name: 'Number of Expected Responses' })).toBeVisible();
+    await expect(page.getByRole('button', { name: 'Start Session' })).toBeVisible();
+  });
+});
diff --git a/tests/e2e/unsuccessful-login-with-invalid-passphrase.e2e.test.ts b/tests/e2e/unsuccessful-login-with-invalid-passphrase.e2e.test.ts
new file mode 100644
index 0000000..bdd663f
--- /dev/null
+++ b/tests/e2e/unsuccessful-login-with-invalid-passphrase.e2e.test.ts
@@ -0,0 +1,21 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Authentication', () => {
+  test('Unsuccessful Login with Invalid Passphrase', async ({ page }) => {
+    // 1. Navigate to the application URL
+    await page.goto('https://unisono.aglink.duckdns.org/login');
+
+    // 2. On the login page, enter an invalid passphrase (e.g., "incorrect-passphrase") into the "Passphrase" textbox.
+    await page.getByRole('textbox', { name: 'Passphrase' }).fill('incorrect-passphrase');
+
+    // 3. Click the "Enter" button.
+    await page.getByRole('button', { name: 'Enter' }).click();
+
+    // Expected Results:
+    // - An error message indicating invalid credentials is displayed.
+    await expect(page.locator('.MuiAlert-standardError', { hasText: 'Invalid passphrase' })).toBeVisible();
+
+    // - The user remains on the login page.
+    await expect(page).toHaveURL(/.*\/login/);
+  });
+});
diff --git a/tests/unisono-test-plan.md b/tests/unisono-test-plan.md
new file mode 100644
index 0000000..21fc6c3
--- /dev/null
+++ b/tests/unisono-test-plan.md
@@ -0,0 +1,93 @@
+# Unisono Application - Comprehensive Test Plan
+
+## Application Overview
+
+The Unisono application facilitates harmonizing desires among participants through real-time collaboration. Users can create sessions, define a topic and optional details, specify the number of expected responses, and then share a link for others to join. The application uses a passphrase for authentication.
+
+## Test Scenarios
+
+### 1. Authentication
+
+#### 1.1 Successful Login with Valid Passphrase
+**Steps:**
+1. Navigate to the application URL (e.g., `https://unisono.aglink.duckdns.org`).
+2. On the login page, enter the valid `AUTH_PASSPHRASE` into the "Passphrase" textbox.
+3. Click the "Enter" button.
+
+**Expected Results:**
+- The user is redirected to a new session creation page (e.g., `/session/<session-id>`).
+- The "Harmonize Desires" heading is visible.
+- The session creation form (Topic, Details, Number of Expected Responses, Start Session button) is displayed.
+
+#### 1.2 Unsuccessful Login with Invalid Passphrase
+**Steps:**
+1. Navigate to the application URL (e.g., `https://unisono.aglink.duckdns.org`).
+2. On the login page, enter an invalid passphrase (e.g., "incorrect-passphrase") into the "Passphrase" textbox.
+3. Click the "Enter" button.
+
+**Expected Results:**
+- An error message indicating invalid credentials is displayed.
+- The user remains on the login page.
+
+### 2. Session Creation
+
+#### 2.1 Create Session with Valid Data
+**Steps:**
+1. Ensure the user is logged in and on the session creation page.
+2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+4. Enter a valid number of participants (e.g., "3") into the "Number of Expected Responses" spinbutton.
+5. Click the "Start Session" button.
+
+**Expected Results:**
+- A new session is created.
+- The user is redirected to the active session page.
+- The session details (Topic, Details, Number of Expected Responses) are displayed correctly.
+- A "Copy Link" button is visible.
+
+#### 2.2 Attempt to Create Session with Missing Topic
+**Steps:**
+1. Ensure the user is logged in and on the session creation page.
+2. Leave the "Topic" textbox empty.
+3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+4. Enter a valid number of participants (e.g., "3") into the "Number of Expected Responses" spinbutton.
+5. Click the "Start Session" button.
+
+**Expected Results:**
+- An error message indicating that the "Topic" field is required is displayed.
+- The session is not created, and the user remains on the session creation page.
+
+#### 2.3 Attempt to Create Session with Invalid Number of Participants (Less than 2)
+**Steps:**
+1. Ensure the user is logged in and on the session creation page.
+2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+4. Enter "1" into the "Number of Expected Responses" spinbutton.
+5. Click the "Start Session" button.
+
+**Expected Results:**
+- An error message indicating that the number of participants must be at least 2 is displayed.
+- The session is not created, and the user remains on the session creation page.
+
+#### 2.4 Attempt to Create Session with Invalid Number of Participants (More than 12)
+**Steps:**
+1. Ensure the user is logged in and on the session creation page.
+2. Enter a valid topic (e.g., "Project Alpha Planning") into the "Topic" textbox.
+3. Enter optional details (e.g., "Discuss Q4 goals and allocate resources") into the "Details (Optional)" textbox.
+4. Enter "13" into the "Number of Expected Responses" spinbutton.
+5. Click the "Start Session" button.
+
+**Expected Results:**
+- An error message indicating that the number of participants cannot exceed 12 is displayed.
+- The session is not created, and the user remains on the session creation page.
+
+### 3. Copy Link Feature
+
+#### 3.1 Verify Copy Link Button Functionality
+**Steps:**
+1. Ensure a session has been successfully created and the user is on the active session page.
+2. Click the "Copy Link" button.
+
+**Expected Results:**
+- A success message (e.g., "Link copied to clipboard!") is displayed.
+- The session URL is copied to the clipboard.