Is it possible to run UITest in an iOS app?

I've already setup UITest target with 1 test function

func testExample() throws {
     let app = XCUIApplication()
     app.launch()
}

then I wanna run UITest target without cmd+u and I've found that we can run Unit test successfully from main target by adding this code

let suite = XCTestSuite.default
for test in suite.tests {
    test.run()
}

but when I try the same way on UITest my testExample failed and I've got this error

Assertion failure in -[XCUIApplication init], XCUIApplication.m:90

No target application path specified via test configuration: (null) (NSInternalInconsistencyException)