Refactor tests to use the new cmocka test runner

## Summary

Fixes https://github.com/profanity-im/profanity/issues/1907  

Update functional and unit test code to comply with the current cmocka test runner.  

## Changes

- `UnitTest` struct to `CMUnitTest` struct
- `unit_test()` macro to `cmocka_unit_test(f)` macro
- `unit_test_setup_teardown()` macro to `cmocka_unit_test_setup_teardown` macro
- `run_tests()` macro to `cmocka_run_group_tests()` function
- Setup and teardown functions return `int` instead of `void`

## Testing

### Unit Tests

`make check`

### Functional Tests

I did not compile or run functional tests because they are *shelved* for now.

### Valgrind

I'm not entirely sure how to fun Valgrind in this case. I did not do fancy memory management, so it should be fine.

tests/functionaltests/functionaltests.c

@@ -23,11 +23,11 @@
 #include "test_muc.h"
 #include "test_disconnect.h"
 
-#define PROF_FUNC_TEST(test) unit_test_setup_teardown(test, init_prof_test, close_prof_test)
+#define PROF_FUNC_TEST(test) cmocka_unit_test_setup_teardown(test, init_prof_test, close_prof_test)
 
 int main(int argc, char* argv[]) {
 
-    const UnitTest all_tests[] = {
+    const struct CMUnitTest all_tests[] = {
 
         PROF_FUNC_TEST(connect_jid_requests_roster),
         PROF_FUNC_TEST(connect_jid_sends_presence_after_receiving_roster),
@@ -111,5 +111,5 @@ int main(int argc, char* argv[]) {
         PROF_FUNC_TEST(disconnect_ends_session),
     };
 
-    return run_tests(all_tests);
+    return cmocka_run_group_tests(all_tests, NULL, NULL);
 }

tests/functionaltests/proftest.c

@@ -138,12 +138,12 @@ prof_start(void)
     setbuf(fp, (char *)0);
 }
 
-void
+int
 init_prof_test(void **state)
 {
     if (stbbr_start(STBBR_LOGDEBUG ,5230, 0) != 0) {
         assert_true(FALSE);
-        return;
+        return -1;
     }
 
     config_orig = getenv("XDG_CONFIG_HOME");
@@ -190,9 +190,10 @@ init_prof_test(void **state)
     assert_true(prof_output_exact("Private chat time display disabled."));
     prof_input("/time xml off");
     assert_true(prof_output_exact("XML Console time display disabled."));
+    return 0;
 }
 
-void
+int
 close_prof_test(void **state)
 {
     prof_input("/quit");
@@ -203,6 +204,7 @@ close_prof_test(void **state)
     setenv("XDG_DATA_HOME", data_orig, 1);
 
     stbbr_stop();
+    return 0;
 }
 
 void

tests/functionaltests/proftest.h

@@ -4,8 +4,8 @@
 #define XDG_CONFIG_HOME "./tests/functionaltests/files/xdg_config_home"
 #define XDG_DATA_HOME   "./tests/functionaltests/files/xdg_data_home"
 
-void init_prof_test(void **state);
-void close_prof_test(void **state);
+int init_prof_test(void **state);
+int close_prof_test(void **state);
 
 void prof_start(void);
 void prof_connect(void);