Fix suffix tests

Author: michiboo

Tests/SwiftAlgorithmsTests/SuffixTests.swift

@@ -13,13 +13,14 @@ import XCTest
 import Algorithms
 
 final class SuffixTests: XCTestCase {
-  
   func testSuffix() {
     let a = 0...10
     XCTAssertEqualSequences(a.suffix(while: { $0 > 5 }), (6...10))
     XCTAssertEqualSequences(a.suffix(while: { $0 > 10 }), [])
-    XCTAssertEqualSequences(a.suffix(while: { $0 > 9 }), [9])
+    XCTAssertEqualSequences(a.suffix(while: { $0 > 9 }), [10])
     XCTAssertEqualSequences(a.suffix(while: { $0 > -1 }), (0...10))
-    let empty = (0...).prefix(0)
+    
+    let empty: [Int] = []
     XCTAssertEqualSequences(empty.suffix(while: { $0 > 10 }), [])
+  }
 }