Refactored.

test/ENABLE_POP3.bats

@@ -0,0 +1,30 @@
+if [ "$ENABLE_POP3" = 1 ]; then
+
+  @test "checking pop: process is running" {
+    run docker exec mail /bin/bash -c "ps aux | grep 'dovecot/pop'"
+    [ "$status" -eq 0 ]
+  }
+
+  @test "checking pop: server responds on port 110" {
+    run docker exec mail /bin/bash -c "nc -w 1 0.0.0.0 110 | grep '+OK'"
+    [ "$status" -eq 0 ]
+  }
+
+  @test "checking pop: authentication works" {
+    run docker exec mail /bin/sh -c "nc -w 1 0.0.0.0 110 < /tmp/docker-mailserver-test/auth/pop3-auth.txt"
+    [ "$status" -eq 0 ]
+  }
+
+else ####################################################################################################
+
+  @test "checking process: process is not running" {
+    run docker exec mail /bin/bash -c "ps aux | grep 'dovecot/pop'"
+    [ "$status" -eq 1 ]
+  }
+
+  @test "checking pop: server does not respond on port 110" {
+    run docker exec mail /bin/bash -c "nc -w 1 0.0.0.0 110"
+    [ "$status" -eq 1 ]
+  }
+
+fi