Add buildEither and URL concatenation with + (#39)

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.1
+// swift-tools-version:5.3
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/Request/Request/RequestBuilder.swift

@@ -33,4 +33,12 @@ public struct RequestBuilder {
         }
         return CombinedParams(children: [])
     }
+
+    public static func buildEither(first: RequestParam) -> RequestParam {
+        return first
+    }
+
+    public static func buildEither(second: RequestParam) -> RequestParam {
+        return second
+    }
 }

Sources/Request/Request/RequestParams/Url/Url.swift

@@ -23,3 +23,11 @@ public struct Url: RequestParam {
         self.value = "\(type.rawValue)://\(url)"
     }
 }
+
+public func + (_ url: Url, _ complementary: String) -> Url {
+    Url("\(url.value ?? "")\(complementary)")
+}
+
+public func + (_ lhs: Url, _ rhs: Url) -> Url {
+    Url("\(lhs.value ?? "")\(rhs.value ?? "")")
+}

Tests/RequestTests/RequestTests.swift

@@ -64,7 +64,7 @@ final class RequestTests: XCTestCase {
             ))
         })
     }
-    
+
     func testQuery() {
         performRequest(Request {
             Url("https://jsonplaceholder.typicode.com/todos")
@@ -74,6 +74,53 @@ final class RequestTests: XCTestCase {
         })
     }
 
+    func testURLConcatenatedStringQuery() {
+        let baseUrl = Url("https://jsonplaceholder.typicode.com")
+        let todosEndpoint = "/todos"
+
+        performRequest(Request {
+            baseUrl + todosEndpoint
+            Method(.get)
+            Query(["userId":"1", "password": "2"])
+            Query([QueryParam("key", value: "value"), QueryParam("key2", value: "value2")])
+        })
+    }
+
+    func testURLConcatenatedURLQuery() {
+        let baseUrl = Url("https://jsonplaceholder.typicode.com")
+        let todosEndpoint = Url("/todos")
+
+        performRequest(Request {
+            baseUrl + todosEndpoint
+            Method(.get)
+            Query(["userId":"1", "password": "2"])
+            Query([QueryParam("key", value: "value"), QueryParam("key2", value: "value2")])
+        })
+    }
+
+    func testBuildEitherQuery() {
+        enum AuthProvider {
+            case explicity(userId: String, password: String)
+            case barrer(String)
+        }
+
+        let provider = AuthProvider.explicity(userId: "1", password: "2")
+
+        performRequest(Request {
+            Url("https://jsonplaceholder.typicode.com/todos")
+            Method(.get)
+
+            switch provider {
+            case .explicity(let userId, let password):
+                Query(["userId":userId, "password": password])
+            case .barrer(let token):
+                Header.Authorization(.bearer(token))
+            }
+
+            Query([QueryParam("key", value: "value"), QueryParam("key2", value: "value2")])
+        })
+    }
+
     func testComplexRequest() {
         performRequest(Request {
             Url("https://jsonplaceholder.typicode.com/todos")