diff --git a/README.md b/README.md
index a8a99f3..ea7b1f6 100644
--- a/README.md
+++ b/README.md
@@ -60,8 +60,8 @@ struct ContentView: View {
                 }
             }
         }
-        .onChange(of: oauth.state) {
-            handle(state: oauth.state)
+        .onChange(of: oauth.state) { state, _ in
+            handle(state: state)
         }
     }
     
@@ -101,7 +101,7 @@ If you want to customize your OAuth environment or are using modules in your app
 
 
 ```swift
-    let oauth: OAuth = .init(.module)
+    let oauth: OAuth = await .init(.module)
 ```
 
 If you are building your OAuth Providers programatically (recommended for production applications via a CI build pipeline for security purposes), you can pass providers and options as well.
@@ -109,7 +109,7 @@ If you are building your OAuth Providers programatically (recommended for produc
 ```swift
     let providers: [OAuth.Provider] = ...
     let options: [OAuth.Option: Sendable] = [.applicationTag: "com.bundle.identifier"]
-    let oauth: OAuth = .init(providers: providers, options: options)
+    let oauth: OAuth = await .init(providers: providers, options: options)
 ```
 
 
diff --git a/Sources/OAuthKit/Extensions/Collection+Extensions.swift b/Sources/OAuthKit/Extensions/Collection+Extensions.swift
index 95cb424..2c5dae2 100644
--- a/Sources/OAuthKit/Extensions/Collection+Extensions.swift
+++ b/Sources/OAuthKit/Extensions/Collection+Extensions.swift
@@ -9,8 +9,9 @@ import Foundation
 
 extension Collection {
 
+    /// Returns true if the collection is not empty.
     @inlinable
     public var isNotEmpty: Bool {
-        return !isEmpty
+        !isEmpty
     }
 }
diff --git a/Sources/OAuthKit/OAuth.swift b/Sources/OAuthKit/OAuth.swift
index d60972c..58380ca 100644
--- a/Sources/OAuthKit/OAuth.swift
+++ b/Sources/OAuthKit/OAuth.swift
@@ -204,8 +204,7 @@ public final class OAuth: NSObject {
     /// The url session to use for communicating with providers.
     @ObservationIgnored
     private lazy var urlSession: URLSession = {
-        let configuration = URLSessionConfiguration.default
-        return URLSession(configuration: URLSessionConfiguration.default)
+        .init(configuration: .default)
     }()
 
     @ObservationIgnored
diff --git a/Sources/OAuthKit/Views/OAWebViewCoordinator.swift b/Sources/OAuthKit/Views/OAWebViewCoordinator.swift
index acfc2e6..260ca11 100644
--- a/Sources/OAuthKit/Views/OAWebViewCoordinator.swift
+++ b/Sources/OAuthKit/Views/OAWebViewCoordinator.swift
@@ -17,7 +17,7 @@ public class OAWebViewCoordinator: NSObject {
 
     /// The oauth reference.
     var oauth: OAuth {
-        return webView.oauth
+        webView.oauth
     }
 
     /// Initializer
diff --git a/Tests/OAuthKitTests/CodableTests.swift b/Tests/OAuthKitTests/CodableTests.swift
new file mode 100644
index 0000000..1b72644
--- /dev/null
+++ b/Tests/OAuthKitTests/CodableTests.swift
@@ -0,0 +1,28 @@
+//
+//  CodeableTests.swift
+//  OAuthKit
+//
+//  Created by Kevin McKee
+//
+
+import Foundation
+@testable import OAuthKit
+import Testing
+
+@Suite("Codable Tests")
+struct CodableTests {
+
+    private let encoder: JSONEncoder = .init()
+    private let decoder: JSONDecoder = .init()
+
+    @Test("Encoding and Decoding Tokens")
+    func whenEncodingDecodingTokens() async throws {
+
+        let token: OAuth.Token = .init(accessToken: UUID().uuidString, refreshToken: UUID().uuidString, expiresIn: 3600, state: "xyz", type: "bearer")
+
+        let data = try encoder.encode(token)
+        let decoded: OAuth.Token = try decoder.decode(OAuth.Token.self, from: data)
+        #expect(token == decoded)
+    }
+
+}
diff --git a/Tests/OAuthKitTests/KeychainTests.swift b/Tests/OAuthKitTests/KeychainTests.swift
index a792459..c07e6a3 100644
--- a/Tests/OAuthKitTests/KeychainTests.swift
+++ b/Tests/OAuthKitTests/KeychainTests.swift
@@ -19,14 +19,14 @@ final class KeychainTests {
     func whenStoring() async throws {
         let keychain = Keychain.default
         let key = "Github"
-        let token = OAuth.Token(accessToken: "1234", refreshToken: nil, expiresIn: 3600, state: "x", type: "bearer")
+        let token: OAuth.Token = .init(accessToken: "1234", refreshToken: nil, expiresIn: 3600, state: "x", type: "bearer")
 
         let inserted = try! keychain.set(token, for: key)
         #expect(inserted == true)
 
         let found: OAuth.Token = try! keychain.get(key: key)!
 
-        #expect(token.accessToken != nil)
+        #expect(token.accessToken.isNotEmpty)
         #expect(token.accessToken == found.accessToken)
         #expect(token.expiresIn == found.expiresIn)
         #expect(token.state == found.state)
diff --git a/Tests/OAuthKitTests/OAuthTests.swift b/Tests/OAuthKitTests/OAuthTests.swift
index 0ace4d3..055d79e 100644
--- a/Tests/OAuthKitTests/OAuthTests.swift
+++ b/Tests/OAuthKitTests/OAuthTests.swift
@@ -11,10 +11,16 @@ import Testing
 @Suite("OAuth Tests", .tags(.oauth))
 final class OAuthTests {
 
+    let oauth: OAuth
+
+    /// Initializer.
+    init() async throws {
+        oauth = await .init(.module)
+    }
+
     /// Tests the init method using a custom bundle.
     @Test("Initializing providers")
     func whenInitializing() async throws {
-        let oauth: OAuth = await .init(.module)
         let providers = await oauth.providers
         #expect(providers.isNotEmpty)
     }
@@ -29,4 +35,27 @@ final class OAuthTests {
         let timeInterval = expiration - Date.now
         #expect(timeInterval < 0)
     }
+
+    /// Tests the authorization request parameters.
+    @Test("Building Authorization Request")
+    func whenBuildingAuthorizationRequest() async throws {
+        let provider = await oauth.providers[0]
+        let request = provider.request(grantType: .authorizationCode)
+        #expect(request != nil)
+        #expect(request!.url!.absoluteString.contains("client_id="))
+        #expect(request!.url!.absoluteString.contains("redirect_uri=\(provider.redirectURI!)"))
+        #expect(request!.url!.absoluteString.contains("response_type=code"))
+    }
+
+    /// Tests the refresh token request parameters.
+    @Test("Building Refresh Token Request")
+    func whenBuildingRefreshTokenRequest() async throws {
+        let provider = await oauth.providers[0]
+        let token: OAuth.Token = .init(accessToken: UUID().uuidString, refreshToken: UUID().uuidString, expiresIn: 3600, state: nil, type: "bearer")
+        let request = provider.request(grantType: .refreshToken, token: token)
+        #expect(request != nil)
+        #expect(request!.url!.absoluteString.contains("client_id="))
+        #expect(request!.url!.absoluteString.contains("grant_type=refresh_token"))
+        #expect(request!.url!.absoluteString.contains("refresh_token=\(token.refreshToken!)"))
+    }
 }