 @testable import Mechanica
 
 class CollectionUtilsTests: XCTestCase {
-
+  
   func testFirstIndex() {
     // Given
     let array = [1, 1, 1, 2, 3, 4, 4, 5, 8]
-
+    
     // When, Then
     let index1 = array.firstIndex(of: 1)
     XCTAssertTrue(index1 == 0)

        XCTAssertTrue(collection.contains(value))
      }
    }

    do {
      let collection = ["a", "b", "c", "d", "e", "z", "1", "👻"]
      for _ in 1...100 {

    let index4 = array.lastIndex(of: 11)
    XCTAssertTrue(index4 == nil)
  }
  
  func testRandom() {
    do {
      let collection = [1]
      for _ in 1...100 {
        XCTAssertTrue(collection.random() == 1)
      }
    }
    
    do {
      let collection = [1, 2]
      for _ in 1...100 {
