diff --git a/packages/node-core/src/integrations/processSession.ts b/packages/node-core/src/integrations/processSession.ts
index f1c7f9b0dadf..d19948cbe6f9 100644
--- a/packages/node-core/src/integrations/processSession.ts
+++ b/packages/node-core/src/integrations/processSession.ts
@@ -18,11 +18,11 @@ export const processSessionIntegration = defineIntegration(() => {
       process.on('beforeExit', () => {
         const session = getIsolationScope().getSession();
 
-        // Only call endSession, if the Session exists on Scope and SessionStatus is not a
-        // Terminal Status i.e. Exited or Crashed because
-        // "When a session is moved away from ok it must not be updated anymore."
+        // Only call endSession if a Session exists on the Scope and has not already reached a
+        // Terminal Status, because "When a session is moved away from ok it must not be updated
+        // anymore." `ok` is the only non-terminal status.
         // Ref: https://develop.sentry.dev/sdk/sessions/
-        if (session?.status !== 'ok') {
+        if (session?.status === 'ok') {
           endSession();
         }
       });
diff --git a/packages/node-core/test/integrations/processSession.test.ts b/packages/node-core/test/integrations/processSession.test.ts
new file mode 100644
index 000000000000..4d511035b8f9
--- /dev/null
+++ b/packages/node-core/test/integrations/processSession.test.ts
@@ -0,0 +1,73 @@
+import { getIsolationScope, setCurrentClient } from '@sentry/core';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { processSessionIntegration } from '../../src/integrations/processSession';
+import { NodeClient } from '../../src/sdk/client';
+import { getDefaultNodeClientOptions } from '../helpers/getDefaultNodeClientOptions';
+
+describe('processSessionIntegration', () => {
+  let client: NodeClient;
+  let sendSession: ReturnType<typeof vi.spyOn>;
+  let beforeExitHandler: () => void;
+
+  beforeEach(() => {
+    getIsolationScope().setSession(undefined);
+
+    client = new NodeClient(getDefaultNodeClientOptions({ release: '1.0.0' }));
+    setCurrentClient(client);
+    client.init();
+    sendSession = vi.spyOn(client, 'sendSession').mockImplementation(() => undefined);
+
+    const processOn = vi.spyOn(process, 'on').mockImplementation(((event: string, listener: () => void) => {
+      if (event === 'beforeExit') {
+        beforeExitHandler = listener;
+      }
+      return process;
+    }) as never);
+
+    processSessionIntegration().setupOnce!();
+    processOn.mockRestore();
+  });
+
+  it('has a name', () => {
+    expect(processSessionIntegration().name).toBe('ProcessSession');
+  });
+
+  it('starts a session on setup', () => {
+    expect(getIsolationScope().getSession()).toEqual(expect.objectContaining({ status: 'ok' }));
+  });
+
+  it('ends the session with status "exited" on a healthy exit', () => {
+    beforeExitHandler();
+
+    expect(sendSession).toHaveBeenCalledTimes(1);
+    expect(sendSession).toHaveBeenCalledWith(expect.objectContaining({ status: 'exited', errors: 0 }));
+  });
+
+  it('ends a session that recorded a handled error', () => {
+    const session = getIsolationScope().getSession()!;
+    session.errors = 1;
+
+    beforeExitHandler();
+
+    expect(sendSession).toHaveBeenCalledWith(expect.objectContaining({ status: 'exited', errors: 1 }));
+  });
+
+  it.each(['exited', 'crashed', 'abnormal', 'unhandled'] as const)('does not update an already-%s session', status => {
+    const session = getIsolationScope().getSession()!;
+    session.status = status;
+    sendSession.mockClear();
+
+    beforeExitHandler();
+
+    expect(sendSession).not.toHaveBeenCalled();
+  });
+
+  it('does nothing when no session is on the scope', () => {
+    getIsolationScope().setSession(undefined);
+    sendSession.mockClear();
+
+    beforeExitHandler();
+
+    expect(sendSession).not.toHaveBeenCalled();
+  });
+});