diff --git a/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MockClient.kt b/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MockClient.kt
new file mode 100644
index 0000000..8fae324
--- /dev/null
+++ b/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MockClient.kt
@@ -0,0 +1,131 @@
+package com.example.movieskmm.data.network.sources
+
+import com.example.movieskmm.BuildKonfig
+import com.example.movieskmm.data.util.ApiConstants
+import io.github.aakira.napier.DebugAntilog
+import io.github.aakira.napier.Napier
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.HttpClientEngine
+import io.ktor.client.engine.mock.MockEngine
+import io.ktor.client.engine.mock.respond
+import io.ktor.client.plugins.HttpTimeout
+import io.ktor.client.plugins.auth.Auth
+import io.ktor.client.plugins.auth.providers.BearerTokens
+import io.ktor.client.plugins.auth.providers.bearer
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.plugins.logging.LogLevel
+import io.ktor.client.plugins.logging.Logging
+import io.ktor.http.ContentType
+import io.ktor.http.HttpHeaders
+import io.ktor.http.HttpStatusCode
+import io.ktor.http.headersOf
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.serialization.json.Json
+import kotlin.test.assertEquals
+
+val mockSuccessEngine = MockEngine {
+    assertEquals(
+        ApiConstants.BASE_URL + ApiConstants.ENDPOINT_NOW_PLAYING_MOVIES,
+        it.url.toString()
+    )
+    respond(
+        content = """
+                    {
+  "dates": {
+    "maximum": "2024-01-17",
+    "minimum": "2023-12-06"
+  },
+  "page": 1,
+  "results": [
+    {
+      "adult": false,
+      "backdrop_path": "/f1AQhx6ZfGhPZFTVKgxG91PhEYc.jpg",
+      "genre_ids": [
+        36,
+        10752,
+        18
+      ],
+      "id": 753342,
+      "original_language": "en",
+      "original_title": "Napoleon",
+      "overview": "An epic that details the checkered rise and fall of French Emperor Napoleon Bonaparte and his relentless journey to power through the prism of his addictive, volatile relationship with his wife, Josephine.",
+      "popularity": 2998.164,
+      "poster_path": "/jE5o7y9K6pZtWNNMEw3IdpHuncR.jpg",
+      "release_date": "2023-11-22",
+      "title": "Napoleon",
+      "video": false,
+      "vote_average": 6.462,
+      "vote_count": 1124
+    },
+    {
+      "adult": false,
+      "backdrop_path": "/vdpE5pjJVql5aD6pnzRqlFmgxXf.jpg",
+      "genre_ids": [
+        18,
+        36
+      ],
+      "id": 906126,
+      "original_language": "es",
+      "original_title": "La sociedad de la nieve",
+      "overview": "On October 13, 1972, Uruguayan Air Force Flight 571, chartered to take a rugby team to Chile, crashes into a glacier in the heart of the Andes.",
+      "popularity": 1811.995,
+      "poster_path": "/2e853FDVSIso600RqAMunPxiZjq.jpg",
+      "release_date": "2023-12-13",
+      "title": "Society of the Snow",
+      "video": false,
+      "vote_average": 8.024,
+      "vote_count": 798
+    }
+  ],
+  "total_pages": 1,
+  "total_results": 2
+}
+                """.trimIndent(),
+        headers = headersOf(
+            HttpHeaders.ContentType,
+            ContentType.Application.Json.toString()
+        )
+    )
+}
+
+val mockFailureEngine = MockEngine {
+    respond(
+        content = "",
+        status = HttpStatusCode.NotFound
+    )
+}
+
+fun getMockHttpClient(engine: HttpClientEngine): HttpClient {
+    return HttpClient(engine) {
+        install(Auth) {
+            bearer {
+                loadTokens {
+                    BearerTokens(
+                        accessToken = BuildKonfig.API_READ_ACCESS_TOKEN,
+                        refreshToken = BuildKonfig.API_READ_ACCESS_TOKEN
+                    )
+                }
+            }
+        }
+        install(HttpTimeout) {
+            val timeout = 30000L
+            connectTimeoutMillis = timeout
+            requestTimeoutMillis = timeout
+            socketTimeoutMillis = timeout
+        }
+        install(ContentNegotiation) {
+            json(
+                Json {
+                    ignoreUnknownKeys = true
+                    prettyPrint = true
+                    isLenient = true
+                }
+            )
+        }
+        install(Logging) {
+            level = LogLevel.ALL
+        }.also {
+            Napier.base(DebugAntilog())
+        }
+    }
+}
\ No newline at end of file
diff --git a/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MoviesSourceTest.kt b/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MoviesSourceTest.kt
new file mode 100644
index 0000000..2d0e9c7
--- /dev/null
+++ b/shared/src/commonTest/kotlin/com/example/movieskmm/data/network/sources/MoviesSourceTest.kt
@@ -0,0 +1,41 @@
+package com.example.movieskmm.data.network.sources
+
+import com.example.movieskmm.domain.util.NetworkResponse
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class MoviesSourceTest {
+    @Test
+    fun `fetch now playing movies - success`() = runTest {
+
+        // Arrange
+        val moviesSource = MoviesSourceImpl(getMockHttpClient(mockSuccessEngine))
+
+        // Act
+        val result = moviesSource.fetchNowPlayingMovies()
+
+        // Assert
+        assertTrue(result is NetworkResponse.Success)
+
+        val firstMovieItem = result.data.results.first().title
+        assertEquals("Napoleon", firstMovieItem)
+
+        val totalResults = result.data.totalResults
+        assertEquals(2, totalResults)
+    }
+
+    @Test
+    fun `fetch now playing movies - failure`() = runTest {
+
+        // Arrange
+        val moviesSource = MoviesSourceImpl(getMockHttpClient(mockFailureEngine))
+
+        // Act
+        val result = moviesSource.fetchNowPlayingMovies()
+
+        // Assert
+        assertTrue(result is NetworkResponse.Failure)
+    }
+}
\ No newline at end of file