tests: standardize naming convention

Use a behavior-driven naming convention for unit tests.

Functions are now named using the pattern: [unit]__[verb]__[scenario]
The __ works as a semantic separator.

Examples:
* jid_create__returns__null_from_null()
* cmd_connect__shows__usage_when_no_server_value

Benefits:
* Easy to find all tests associated with a specific function using the
  mandatory prefix.
* Test output in CI now explicitly describes the unit, the expected
  outcome, and the scenario being tested.

Also disabled keyhandlers tests due to missing code in src/ui.

tests/unittests/xmpp/test_jid.h

@@ -1,25 +1,30 @@
-void create_jid_from_null_returns_null(void** state);
-void create_jid_from_empty_string_returns_null(void** state);
-void create_jid_from_full_returns_full(void** state);
-void create_jid_from_full_returns_bare(void** state);
-void create_jid_from_full_returns_resourcepart(void** state);
-void create_jid_from_full_returns_localpart(void** state);
-void create_jid_from_full_returns_domainpart(void** state);
-void create_jid_from_full_nolocal_returns_full(void** state);
-void create_jid_from_full_nolocal_returns_bare(void** state);
-void create_jid_from_full_nolocal_returns_resourcepart(void** state);
-void create_jid_from_full_nolocal_returns_domainpart(void** state);
-void create_jid_from_full_nolocal_returns_null_localpart(void** state);
-void create_jid_from_bare_returns_null_full(void** state);
-void create_jid_from_bare_returns_null_resource(void** state);
-void create_jid_from_bare_returns_bare(void** state);
-void create_jid_from_bare_returns_localpart(void** state);
-void create_jid_from_bare_returns_domainpart(void** state);
-void create_room_jid_returns_room(void** state);
-void create_room_jid_returns_nick(void** state);
-void create_with_slash_in_resource(void** state);
-void create_with_at_in_resource(void** state);
-void create_with_at_and_slash_in_resource(void** state);
-void create_full_with_trailing_slash(void** state);
-void returns_fulljid_when_exists(void** state);
-void returns_barejid_when_fulljid_not_exists(void** state);
+#ifndef TESTS_TEST_JID_H
+#define TESTS_TEST_JID_H
+
+void jid_create__returns__null_from_null(void** state);
+void jid_create__returns__null_from_empty_string(void** state);
+void jid_create__returns__full_from_full(void** state);
+void jid_create__returns__bare_from_full(void** state);
+void jid_create__returns__resourcepart_from_full(void** state);
+void jid_create__returns__localpart_from_full(void** state);
+void jid_create__returns__domainpart_from_full(void** state);
+void jid_create__returns__full_from_full_nolocal(void** state);
+void jid_create__returns__bare_from_full_nolocal(void** state);
+void jid_create__returns__resourcepart_from_full_nolocal(void** state);
+void jid_create__returns__domainpart_from_full_nolocal(void** state);
+void jid_create__returns__null_localpart_from_full_nolocal(void** state);
+void jid_create__returns__null_full_from_bare(void** state);
+void jid_create__returns__null_resource_from_bare(void** state);
+void jid_create__returns__bare_from_bare(void** state);
+void jid_create__returns__localpart_from_bare(void** state);
+void jid_create__returns__domainpart_from_bare(void** state);
+void jid_create_from_bare_and_resource__returns__room(void** state);
+void jid_create_from_bare_and_resource__returns__nick(void** state);
+void jid_create__returns__correct_parts_with_slash_in_resource(void** state);
+void jid_create__returns__correct_parts_with_at_in_resource(void** state);
+void jid_create__returns__correct_parts_with_at_and_slash_in_resource(void** state);
+void jid_create__returns__correct_parts_with_trailing_slash(void** state);
+void jid_fulljid_or_barejid__returns__fulljid_when_exists(void** state);
+void jid_fulljid_or_barejid__returns__barejid_when_fulljid_not_exists(void** state);
+
+#endif