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_form.h

@@ -1,21 +1,26 @@
-void get_form_type_field_returns_null_no_fields(void** state);
-void get_form_type_field_returns_null_when_not_present(void** state);
-void get_form_type_field_returns_value_when_present(void** state);
-void get_field_type_returns_unknown_when_no_fields(void** state);
-void get_field_type_returns_correct_type(void** state);
-void set_value_adds_when_none(void** state);
-void set_value_updates_when_one(void** state);
-void add_unique_value_adds_when_none(void** state);
-void add_unique_value_does_nothing_when_exists(void** state);
-void add_unique_value_adds_when_doesnt_exist(void** state);
-void add_value_adds_when_none(void** state);
-void add_value_adds_when_some(void** state);
-void add_value_adds_when_exists(void** state);
-void remove_value_does_nothing_when_none(void** state);
-void remove_value_does_nothing_when_doesnt_exist(void** state);
-void remove_value_removes_when_one(void** state);
-void remove_value_removes_when_many(void** state);
-void remove_text_multi_value_does_nothing_when_none(void** state);
-void remove_text_multi_value_does_nothing_when_doesnt_exist(void** state);
-void remove_text_multi_value_removes_when_one(void** state);
-void remove_text_multi_value_removes_when_many(void** state);
+#ifndef TESTS_TEST_FORM_H
+#define TESTS_TEST_FORM_H
+
+void form_get_form_type_field__returns__null_no_fields(void** state);
+void form_get_form_type_field__returns__null_when_not_present(void** state);
+void form_get_form_type_field__returns__value_when_present(void** state);
+void form_get_field_type__returns__unknown_when_no_fields(void** state);
+void form_get_field_type__returns__correct_type(void** state);
+void form_set_value__updates__adds_when_none(void** state);
+void form_set_value__updates__updates_when_one(void** state);
+void form_add_unique_value__updates__adds_when_none(void** state);
+void form_add_unique_value__updates__does_nothing_when_exists(void** state);
+void form_add_unique_value__updates__adds_when_doesnt_exist(void** state);
+void form_add_value__updates__adds_when_none(void** state);
+void form_add_value__updates__adds_when_some(void** state);
+void form_add_value__updates__adds_when_exists(void** state);
+void form_remove_value__updates__does_nothing_when_none(void** state);
+void form_remove_value__updates__does_nothing_when_doesnt_exist(void** state);
+void form_remove_value__updates__removes_when_one(void** state);
+void form_remove_value__updates__removes_when_many(void** state);
+void form_remove_text_multi_value__updates__does_nothing_when_none(void** state);
+void form_remove_text_multi_value__updates__does_nothing_when_doesnt_exist(void** state);
+void form_remove_text_multi_value__updates__removes_when_one(void** state);
+void form_remove_text_multi_value__updates__removes_when_many(void** state);
+
+#endif