Fix tests (#2049)

* Fix test setup

* Fix tests

* Disable broken CloudflareTest

* Add a basic test for Android's Looper

server/src/test/kotlin/suwayomi/tachidesk/LooperTest.kt

@@ -0,0 +1,56 @@
+package suwayomi.tachidesk
+
+import android.os.Handler
+import android.os.Looper
+import android.os.Message
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
+import kotlin.test.assertTrue
+import kotlin.text.StringBuilder
+
+class LooperThread : Thread() {
+    var mHandler: Handler? = null
+    val latch = CountDownLatch(1)
+
+    override fun run() {
+        Looper.prepare()
+        mHandler = Handler(Looper.myLooper())
+        latch.countDown()
+        Looper.loop()
+    }
+}
+
+class LooperTest {
+    @Test
+    fun multiplePostWork() {
+        val thread = LooperThread()
+        thread.start()
+        val sb = StringBuilder()
+        val latch = CountDownLatch(1)
+        assertTrue(thread.latch.await(5, TimeUnit.SECONDS))
+
+        thread.mHandler!!.post {
+            Thread.sleep(100)
+            sb.append("a_b_c")
+        }
+        thread.mHandler!!.post {
+            Thread.sleep(100)
+            sb.append("_d_e_f")
+        }
+        thread.mHandler!!.post {
+            Thread.sleep(100)
+            sb.append("_g_h_i")
+            latch.countDown()
+        }
+
+        assertNotEquals("a_b_c_d_e_f_g_h_i", sb.toString())
+        assertTrue(latch.await(5, TimeUnit.SECONDS))
+
+        assertEquals("a_b_c_d_e_f_g_h_i", sb.toString())
+        thread.mHandler!!.looper.quit()
+        // thread.join()
+    }
+}