feat: add one more test to Observable

Author: htmlprogrammist

Tests/ObservableTests.swift

@@ -15,21 +15,30 @@ class ObservableTests: XCTestCase {
 
  override func setUpWithError() throws {
  observable = Observable(value: 0)
- observable.bind { [unowned self] number in
- newValue = number
- }
  }
 
  override func tearDownWithError() throws {
  observable = nil
  newValue = nil
  }
 
- func testChangingValue() throws {
+ func testChangingValueWithBinding() throws {
  let newNumber = 1
+ observable.bind { [unowned self] number in
+ newValue = number
+ }
 
  observable.value = newNumber
 
  XCTAssertEqual(newValue, newNumber)
  }
+ 
+ func testChangingValueWithoutBinding() throws {
+ let newNumber = 1
+ 
+ observable.value = newNumber
+ 
+ XCTAssertNil(newValue)
+ XCTAssertNotEqual(newValue, newNumber)
+ }
 }