Prevent cypress environments from being treated as unit tests (#2273)

.changeset/slow-otters-deny.md

@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': patch
+---
+
+Fixed an issue where the internal unit test detection logic was incorrectly treating Cypress like a unit test environment.

packages/itwinui-react/src/utils/functions/dev.ts

@@ -6,10 +6,12 @@
 // @ts-expect-error -- jest is not used in iTwinUI but may be used in consuming apps
 const isJest = typeof jest !== 'undefined';
 
+const isCypress = typeof (globalThis as any).Cypress !== 'undefined';
 const isMocha =
   typeof (globalThis as any).beforeEach !== 'undefined' &&
   `${(globalThis as any).beforeEach}`.replace(/\s/g, '') ===
-    'function(name,fn){suites[0].beforeEach(name,fn);}';
+    'function(name,fn){suites[0].beforeEach(name,fn);}' &&
+  !isCypress;
 const isVitest = typeof (globalThis as any).__vitest_index__ !== 'undefined';
 
 const isUnitTest = isJest || isVitest || isMocha;