Fix SubnetTest

mobile/src/test/java/com/github/shadowsocks/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package com.github.shadowsocks
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see [Testing documentation](http://d.android.com/tools/testing)
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, (2 + 2).toLong())
-    }
-}

mobile/src/test/java/com/github/shadowsocks/utils/SubnetTest.kt

@@ -1,11 +1,10 @@
 package com.github.shadowsocks.utils
 
-import com.github.shadowsocks.utils.Subnet
 import org.junit.Assert
 import org.junit.Test
 import java.net.InetAddress
 
-object SubnetTest {
+class SubnetTest {
     @Test
     fun parsingAndEquals() {
         Assert.assertEquals(Subnet(InetAddress.getByName("1.10.11.12"), 25), Subnet.fromString("1.10.11.12/25"))