diff --git a/api/src/androidTest/java/com/readrops/api/utils/AuthInterceptorTest.kt b/api/src/androidTest/java/com/readrops/api/utils/AuthInterceptorTest.kt
new file mode 100644
index 00000000..ea425a05
--- /dev/null
+++ b/api/src/androidTest/java/com/readrops/api/utils/AuthInterceptorTest.kt
@@ -0,0 +1,54 @@
+package com.readrops.api.utils
+
+import com.readrops.api.services.freshrss.FreshRSSCredentials
+import junit.framework.TestCase.assertEquals
+import junit.framework.TestCase.assertNull
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.mockwebserver.MockResponse
+import okhttp3.mockwebserver.MockWebServer
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+
+class AuthInterceptorTest {
+
+    private val interceptor = AuthInterceptor()
+    private val mockServer = MockWebServer()
+    private lateinit var okHttpClient: OkHttpClient
+
+    @Before
+    fun before() {
+        okHttpClient = OkHttpClient.Builder().addInterceptor(interceptor).build()
+        mockServer.start(8080)
+    }
+
+    @After
+    fun tearDown() {
+        mockServer.close()
+    }
+
+    @Test
+    fun credentialsUrlTest() {
+        mockServer.enqueue(MockResponse())
+        interceptor.credentials = FreshRSSCredentials("token", "http://localhost:8080/rss")
+
+        okHttpClient.newCall(Request.Builder().url(mockServer.url("/url")).build()).execute()
+        val request = mockServer.takeRequest()
+
+        assertEquals(request.requestUrl.toString(), "http://localhost:8080/rss/url")
+        assertEquals(request.headers["Authorization"], "GoogleLogin auth=token")
+    }
+
+    @Test
+    fun nullCredentialsTest() {
+        mockServer.enqueue(MockResponse())
+        interceptor.credentials = null
+
+        okHttpClient.newCall(Request.Builder().url(mockServer.url("/url")).build()).execute()
+        val request = mockServer.takeRequest()
+
+        assertEquals(request.requestUrl.toString(), "http://localhost:8080/url")
+        assertNull(request.headers["Authorization"])
+    }
+}
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