diff --git a/Tests/TMDbTests/TMDbClientTests.swift b/Tests/TMDbTests/TMDbClientTests.swift
new file mode 100644
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+++ b/Tests/TMDbTests/TMDbClientTests.swift
@@ -0,0 +1,139 @@
+//
+//  TMDbClientTests.swift
+//  TMDb
+//
+//  Copyright © 2024 Adam Young.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an AS IS BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+import Foundation
+import Testing
+
+@testable import TMDb
+
+@Suite
+struct TMDbClientTests {
+
+    var apiKey: String!
+
+    init() {
+        self.apiKey = "test-api-key"
+    }
+
+    @Test("init with API key creates account service")
+    func initWithAPIKeyCreatesAccountService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.account is TMDbAccountService)
+    }
+
+    @Test("init with API key creates authentication service")
+    func initWithAPIKeyCreatesAuthenticationService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.authentication is TMDbAuthenticationService)
+    }
+
+    @Test("init with API key creates certification service")
+    func initWithAPIKeyCreatesCertificationService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.certifications is TMDbCertificationService)
+    }
+
+    @Test("init with API key creates company service")
+    func initWithAPIKeyCreatesCompanyService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.companies is TMDbCompanyService)
+    }
+
+    @Test("init with API key creates configuration service")
+    func initWithAPIKeyCreatesConfigurationService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.configurations is TMDbConfigurationService)
+    }
+
+    @Test("init with API key creates discover service")
+    func initWithAPIKeyCreatesDiscoverService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.discover is TMDbDiscoverService)
+    }
+
+    @Test("init with API key creates genre service")
+    func initWithAPIKeyCreatesGenreService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.genres is TMDbGenreService)
+    }
+
+    @Test("init with API key creates movie service")
+    func initWithAPIKeyCreatesMovieService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.movies is TMDbMovieService)
+    }
+
+    @Test("init with API key creates person service")
+    func initWithAPIKeyCreatesPersonService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.people is TMDbPersonService)
+    }
+
+    @Test("init with API key creates search service")
+    func initWithAPIKeyCreatesSearchService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.search is TMDbSearchService)
+    }
+
+    @Test("init with API key creates trending service")
+    func initWithAPIKeyCreatesTrendingService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.trending is TMDbTrendingService)
+    }
+
+    @Test("init with API key creates TV episode service")
+    func initWithAPIKeyCreatesTVEpisodeService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.tvEpisodes is TMDbTVEpisodeService)
+    }
+
+    @Test("init with API key creates TV season service")
+    func initWithAPIKeyCreatesTVSeasonService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.tvSeasons is TMDbTVSeasonService)
+    }
+
+    @Test("init with API key creates TV series service")
+    func initWithAPIKeyCreatesTVSeriesService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.tvSeries is TMDbTVSeriesService)
+    }
+
+    @Test("init with API key creates watch provider service")
+    func initWithAPIKeyCreatesWatchProviderService() {
+        let client = TMDbClient(apiKey: apiKey)
+
+        #expect(client.watchProviders is TMDbWatchProviderService)
+    }
+
+}