         // Given
         let promise = expectation(description: #function)
         
+        guard let urlGet = URL(string: "https://httpbin.org/get"),
+            let urlPost = URL(string: "https://httpbin.org/post"),
+            let urlPatch = URL(string: "https://httpbin.org/patch"),
+            let urlDelete = URL(string: "https://httpbin.org/delete") else {
+                XCTFail("URL was not valid")
+                return
+        }
+        
         let requests = [
-            URLRequest(
-                url: URL(string: "https://httpbin.org/get")!,
-                method: .get
-            ),
-            URLRequest(
-                url: URL(string: "https://httpbin.org/post")!,
-                method: .post
-            ),
-            URLRequest(
-                url: URL(string: "https://httpbin.org/patch")!,
-                method: .patch
-            ),
-            URLRequest(
-                url: URL(string: "https://httpbin.org/delete")!,
-                method: .delete
-            )
+            URLRequest(url: urlGet, method: .get),
+            URLRequest(url: urlPost, method: .post),
+            URLRequest(url: urlPatch, method: .patch),
+            URLRequest(url: urlDelete, method: .delete)
         ]
         
         var response0: NetworkAPI.Response?

        // Given
        let promise = expectation(description: #function)
        
        let headers: [String: String] = [
            "Abc": "test123",
            "Def": "test456",
            "Xyz": "test789"
        ]
        
        let request = URLRequest(
            url: URL(string: "https://httpbin.org/put")!,
            method: .put,
            headers: headers
        )
        
        var response: NetworkAPI.Response?
        
        // When

    func testPOSTWithParameters() {
        // Given
        let promise = expectation(description: #function)
        
        guard let url = URL(string: "https://httpbin.org/post") else {
            XCTFail("URL was not valid")
            return
        }
        
        let parameters: [String: Any] = [
            "abc": 123,
