remove unit test (removed before but added again when resolving confl…

…ict)

Enact-DCO-1.0-Signed-off-by: Jiye Kim (jiye.kim@lge.com)

packages/core/platform/tests/platform-specs.js

@@ -165,13 +165,6 @@ describe('platform', () => {
 			windowSpy.mockRestore();
 		});
 
-		test('should return `true` for `unknown` in the testing environment', () => { // Deprecated: will be removed in 5.0.0
-			// The first access invokes detecting based on user agent value
-			expect(platform['unknown']).toBe(true);
-			// The second access makes the module to return already detected platform information
-			expect(platform['unknown']).toBe(true);
-		});
-
 		test('should return `webos` for `type` in WebOSTV environment', () => {
 			Object.defineProperty(globalThis.navigator, "userAgent", {
 				value: 'Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 WebAppManager',