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/command/test_cmd_connect.h

@@ -1,27 +1,32 @@
-void cmd_connect_shows_message_when_disconnecting(void** state);
-void cmd_connect_shows_message_when_connecting(void** state);
-void cmd_connect_shows_message_when_connected(void** state);
-void cmd_connect_shows_message_when_undefined(void** state);
-void cmd_connect_when_no_account(void** state);
-void cmd_connect_with_altdomain_when_provided(void** state);
-void cmd_connect_fail_message(void** state);
-void cmd_connect_lowercases_argument_with_no_account(void** state);
-void cmd_connect_lowercases_argument_with_account(void** state);
-void cmd_connect_asks_password_when_not_in_account(void** state);
-void cmd_connect_shows_message_when_connecting_with_account(void** state);
-void cmd_connect_connects_with_account(void** state);
-void cmd_connect_shows_usage_when_no_server_value(void** state);
-void cmd_connect_shows_usage_when_server_no_port_value(void** state);
-void cmd_connect_shows_usage_when_no_port_value(void** state);
-void cmd_connect_shows_usage_when_port_no_server_value(void** state);
-void cmd_connect_shows_message_when_port_0(void** state);
-void cmd_connect_shows_message_when_port_minus1(void** state);
-void cmd_connect_shows_message_when_port_65536(void** state);
-void cmd_connect_shows_message_when_port_contains_chars(void** state);
-void cmd_connect_with_server_when_provided(void** state);
-void cmd_connect_with_port_when_provided(void** state);
-void cmd_connect_with_server_and_port_when_provided(void** state);
-void cmd_connect_shows_usage_when_server_provided_twice(void** state);
-void cmd_connect_shows_usage_when_port_provided_twice(void** state);
-void cmd_connect_shows_usage_when_invalid_first_property(void** state);
-void cmd_connect_shows_usage_when_invalid_second_property(void** state);
+#ifndef TESTS_TEST_CMD_CONNECT_H
+#define TESTS_TEST_CMD_CONNECT_H
+
+void cmd_connect__shows__message_when_disconnecting(void** state);
+void cmd_connect__shows__message_when_connecting(void** state);
+void cmd_connect__shows__message_when_connected(void** state);
+void cmd_connect__shows__message_when_undefined(void** state);
+void cmd_connect__tests__no_account(void** state);
+void cmd_connect__tests__with_altdomain_when_provided(void** state);
+void cmd_connect__shows__fail_message(void** state);
+void cmd_connect__tests__lowercases_argument_with_no_account(void** state);
+void cmd_connect__tests__lowercases_argument_with_account(void** state);
+void cmd_connect__tests__asks_password_when_not_in_account(void** state);
+void cmd_connect__shows__message_when_connecting_with_account(void** state);
+void cmd_connect__tests__connects_with_account(void** state);
+void cmd_connect__shows__usage_when_no_server_value(void** state);
+void cmd_connect__shows__usage_when_server_no_port_value(void** state);
+void cmd_connect__shows__usage_when_no_port_value(void** state);
+void cmd_connect__shows__usage_when_port_no_server_value(void** state);
+void cmd_connect__shows__message_when_port_0(void** state);
+void cmd_connect__shows__message_when_port_minus1(void** state);
+void cmd_connect__shows__message_when_port_65536(void** state);
+void cmd_connect__shows__message_when_port_contains_chars(void** state);
+void cmd_connect__tests__with_server_when_provided(void** state);
+void cmd_connect__tests__with_port_when_provided(void** state);
+void cmd_connect__tests__with_server_and_port_when_provided(void** state);
+void cmd_connect__shows__usage_when_server_provided_twice(void** state);
+void cmd_connect__shows__usage_when_port_provided_twice(void** state);
+void cmd_connect__shows__usage_when_invalid_first_property(void** state);
+void cmd_connect__shows__usage_when_invalid_second_property(void** state);
+
+#endif