With more unit test cases (#3269)

app/src/test/kotlin/fr/free/nrw/commons/auth/LogoutClientTest.kt

@@ -0,0 +1,46 @@
+package fr.free.nrw.commons.auth
+
+import com.nhaarman.mockito_kotlin.verify
+import io.reactivex.Observable
+import org.junit.Before
+import org.junit.Test
+import org.mockito.ArgumentMatchers.anyString
+import org.mockito.InjectMocks
+import org.mockito.Mock
+import org.mockito.Mockito
+import org.mockito.Mockito.*
+import org.mockito.MockitoAnnotations
+import org.wikipedia.dataclient.Service
+import org.wikipedia.dataclient.mwapi.MwPostResponse
+import org.wikipedia.dataclient.mwapi.MwQueryResponse
+import org.wikipedia.dataclient.mwapi.MwQueryResult
+import javax.inject.Inject
+import javax.inject.Named
+
+class LogoutClientTest {
+
+    @Mock @field:[Inject Named("commons-service")]
+    internal var service: Service? = null
+
+    @InjectMocks
+    var logoutClient: LogoutClient? = null
+
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        val mwQueryResponse = Mockito.mock(MwQueryResponse::class.java)
+        val mwQueryResult = Mockito.mock(MwQueryResult::class.java)
+        `when`(mwQueryResult!!.csrfToken()).thenReturn("test_token")
+        `when`(mwQueryResponse.query()).thenReturn(mwQueryResult)
+        `when`(service!!.csrfToken)
+                .thenReturn(Observable.just(mwQueryResponse))
+    }
+
+    @Test
+    fun postLogout() {
+        `when`(service!!.postLogout(anyString())).thenReturn(Observable.just(mock(MwPostResponse::class.java)))
+        logoutClient!!.postLogout()
+        verify(service, times(1))!!.csrfToken
+    }
+}