Quick nimble variable is always nil - swift

Question

I create a basic test case, I cannot instantiate the variable. And while test is running, it always crashes.
import Foundation
import XCTest
import Quick
import Nimble
import UIKit
#testable import tar22102
class ViewControllerTests: QuickSpec {
override func spec() {
var vc: ViewController?
beforeEach{               
vc = ViewController()
let _ = vc?.view
}
describe("testing Initial values") {
context("Reading values") {
expect(vc).toNot(beNil())
}
}
}
This is the crash log. I put breakpoint to the lines in the beforeEach, it would not reach. I also have switched to several different projects. The same issue happens.
2020-07-18 07:49:36.935064-0400 tar22102[15304:300447] Launching with XCTest injected. Preparing to run tests.
2020-07-18 07:49:37.263912-0400 tar22102[15304:300447] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'An exception occurred when building Quick's example groups.
Some possible reasons this might happen include:
- An 'expect(...).to' expectation was evaluated outside of an 'it', 'context', or 'describe' block
- 'sharedExamples' was called twice with the same name
- 'itBehavesLike' was called with a name that is not registered as a shared example
Here's the original exception: 'NSInternalInconsistencyException', reason: 'Attempted to report a test failure to XCTest while no test case was running. The failure was:
"expected to not be nil, got <nil>
"
It occurred at: /Users/hzhan25/Desktop/DD/22102/22102Tests/_2102Tests.swift:27', userInfo: '(null)''
*** First throw call stack:
(
0 CoreFoundation 0x000000010eb8327e __exceptionPreprocess + 350
1 libobjc.A.dylib 0x000000010ce4db20 objc_exception_throw + 48
2 CoreFoundation 0x000000010eb830bc +[NSException raise:format:] + 188
3 22102Tests 0x000000012b7dc8f9 __23+[QuickSpec initialize]_block_invoke + 457
4 22102Tests 0x000000012b7f8cda $sIyB_Ieg_TR + 10
5 22102Tests 0x000000012b7f8b82 $s5Quick5WorldC30performWithCurrentExampleGroup_7closureyAA0fG0C_yyXEtF + 370
6 22102Tests 0x000000012b7f8c9b $s5Quick5WorldC30performWithCurrentExampleGroup_7closureyAA0fG0C_yyXEtFTo + 107
7 22102Tests 0x000000012b7dc705 +[QuickSpec initialize] + 229
8 libobjc.A.dylib 0x000000010ce4e103 CALLING_SOME_+initialize_METHOD + 17
9 libobjc.A.dylib 0x000000010ce4eee9 initializeNonMetaClass + 624
10 libobjc.A.dylib 0x000000010ce4f4ba _ZL24initializeAndMaybeRelockP10objc_classP11objc_objectR8mutex_ttILb0EEb + 157
11 libobjc.A.dylib 0x000000010ce59a5d lookUpImpOrForward + 595
12 libobjc.A.dylib 0x000000010ce4a219 _objc_msgSend_uncached + 73
13 Foundation 0x000000010d12852b -[NSBundle loadAndReturnError:] + 1141
14 libXCTestBundleInject.dylib 0x000000010cc46719 __XCTestBundleInject + 538
15 ??? 0x000000010cbb53a7 0x0 + 4508570535
16 ??? 0x000000010cbb57b8 0x0 + 4508571576
17 ??? 0x000000010cbb09a2 0x0 + 4508551586
18 ??? 0x000000010cbaf7a6 0x0 + 4508546982
19 ??? 0x000000010cbaf846 0x0 + 4508547142
20 ??? 0x000000010cba4046 0x0 + 4508500038
21 ??? 0x000000010cba80fc 0x0 + 4508516604
22 ??? 0x000000010cba31cd 0x0 + 4508496333
23 ??? 0x000000010d055234 0x0 + 4513419828
24 ??? 0x000000010d0530ce 0x0 + 4513411278
25 ??? 0x000000010d04e503 0x0 + 4513391875
26 ??? 0x000000010d04e036 0x0 + 4513390646
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

Matcher calls need to be inside an it block
describe("Initial values") {
it("Sets vc") {
expect(vc).toNot(beNil())
}
}