Minor - code householding (tests)

- Remove redundant uses of WrapperMock
- Use assertThat() from JUnit, not hamcrest
- Use hamcrest Matchers everywhere (not BaseMatchers etc.)
- Favor Mockito's argThat() over using ArgumentCaptor (more succinct)
- Delete useless test classes

src/test/java/fr/xephi/authme/command/executable/email/AddEmailCommandTest.java

@@ -3,7 +3,6 @@ package fr.xephi.authme.command.executable.email;
 import fr.xephi.authme.command.CommandService;
 import fr.xephi.authme.process.Management;
 import fr.xephi.authme.settings.NewSetting;
-import fr.xephi.authme.util.WrapperMock;
 import org.bukkit.command.BlockCommandSender;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
@@ -29,7 +28,6 @@ public class AddEmailCommandTest {
     @Before
     public void setUpMocks() {
         commandService = mock(CommandService.class);
-        WrapperMock.createInstance();
     }
 
     @Test

src/test/java/fr/xephi/authme/command/executable/email/RecoverEmailCommandTest.java

@@ -1,41 +0,0 @@
-package fr.xephi.authme.command.executable.email;
-
-import fr.xephi.authme.command.CommandService;
-import fr.xephi.authme.util.WrapperMock;
-import org.bukkit.command.BlockCommandSender;
-import org.bukkit.command.CommandSender;
-import org.junit.Before;
-import org.junit.Ignore;
-import org.junit.Test;
-import org.mockito.Mockito;
-
-import java.util.ArrayList;
-
-import static org.mockito.Mockito.mock;
-
-/**
- * Test for {@link RecoverEmailCommand}.
- */
-public class RecoverEmailCommandTest {
-
-    @Before
-    public void setUpMocks() {
-        WrapperMock wrapper = WrapperMock.createInstance();
-    }
-
-    @Test
-    @Ignore
-    public void shouldRejectNonPlayerSender() {
-        // given
-        CommandSender sender = Mockito.mock(BlockCommandSender.class);
-        RecoverEmailCommand command = new RecoverEmailCommand();
-
-        // when
-        command.executeCommand(sender, new ArrayList<String>(), mock(CommandService.class));
-
-        // then
-    }
-
-    // TODO ljacqu 20151121: Expand tests. This command doesn't use a scheduler and has all of its
-    // logic inside here.
-}