 @testable import Mechanica
 
 class RangeReplaceableCollectionUtilsTests: XCTestCase {
-  
-    func test_removeFirst() {
-      var all = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] // 11 elements
-      /// removes the first even Int
-      let removedElement = all.removeFirst { (x) -> Bool in return (x.isEven) }
-      XCTAssertNotNil(removedElement)
-      XCTAssertTrue(removedElement! == 0)
-      XCTAssertTrue(all.count == 10)
-      XCTAssertTrue(all == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
-    }
+
+  func test_removeFirst() {
+    var all = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] // 11 elements
+    /// removes the first even Int
+    let removedElement = all.removeFirst { (x) -> Bool in return (x.isEven) }
+    XCTAssertNotNil(removedElement)
+    XCTAssertTrue(removedElement! == 0)
+    XCTAssertTrue(all.count == 10)
+    XCTAssertTrue(all == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
+  }
 
   func test_removingFirst() {
     let all = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] // 11 elements

    XCTAssertTrue(all.count == 11)

  }
  
  func test_removeAll() {
    var all = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] // 11 elements
    /// removes the first even Int

    XCTAssertTrue(all.count == 10)
    XCTAssertTrue(all == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
  }

  func test_removingLast() {
    let all = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] // 11 elements
    let newAll = all.removingLast { (x) -> Bool in return (x.isEven)}
