ENH: Test datatypes and values in Extern C interface

Integration tests for https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/420 and caosdb-cpplib!13 (merged)

Almost solely whitespace changes that my clang-tidy performed, the only real changes concern the way strings are "returned" by the Extern C interface.

test/test_ccaosdb.cpp

@@ -37,7 +37,7 @@ TEST(test_ccaosdb, connection_ssl_authentication_success) {
   auto major = caosdb_constants_COMPATIBLE_SERVER_VERSION_MAJOR();
   auto minor = caosdb_constants_COMPATIBLE_SERVER_VERSION_MINOR();
   const auto *const pre_release =
-      caosdb_constants_COMPATIBLE_SERVER_VERSION_PRE_RELEASE();
+    caosdb_constants_COMPATIBLE_SERVER_VERSION_PRE_RELEASE();
 
   EXPECT_EQ(major, version_info.major);
   EXPECT_EQ(minor, version_info.minor);
@@ -48,12 +48,12 @@ TEST(test_ccaosdb, test_count_query) {
 
   caosdb_connection_connection connection;
   int return_code(
-      caosdb_connection_connection_manager_get_default_connection(&connection));
+    caosdb_connection_connection_manager_get_default_connection(&connection));
   EXPECT_EQ(return_code, 0);
 
   caosdb_transaction_transaction transaction;
-  return_code = caosdb_connection_connection_create_transaction(&connection,
-                                                                &transaction);
+  return_code =
+    caosdb_connection_connection_create_transaction(&connection, &transaction);
   EXPECT_EQ(return_code, 0);
 
   // COUNT query with an empty result
@@ -67,7 +67,7 @@ TEST(test_ccaosdb, test_count_query) {
   long dummy(-1);       // NOLINT
   long *count = &dummy; // NOLINT
   return_code =
-      caosdb_transaction_transaction_get_count_result(&transaction, count);
+    caosdb_transaction_transaction_get_count_result(&transaction, count);
   EXPECT_EQ(return_code, 0);
   EXPECT_EQ(*count, 0);
 
@@ -78,12 +78,12 @@ TEST(test_ccaosdb, test_count_query) {
 TEST(test_ccaosdb, test_query) {
   caosdb_connection_connection connection;
   int return_code(
-      caosdb_connection_connection_manager_get_default_connection(&connection));
+    caosdb_connection_connection_manager_get_default_connection(&connection));
   EXPECT_EQ(return_code, 0);
 
   caosdb_transaction_transaction transaction;
-  return_code = caosdb_connection_connection_create_transaction(&connection,
-                                                                &transaction);
+  return_code =
+    caosdb_connection_connection_create_transaction(&connection, &transaction);
   EXPECT_EQ(return_code, 0);
 
   return_code = caosdb_transaction_transaction_query(&transaction,
@@ -95,7 +95,7 @@ TEST(test_ccaosdb, test_query) {
 
   caosdb_transaction_result_set result_set;
   return_code =
-      caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
+    caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
   EXPECT_EQ(return_code, 0);
 
   int dummy(-1);
@@ -111,16 +111,16 @@ TEST(test_ccaosdb, test_query) {
 TEST(test_ccaosdb, test_single_id_retrieve) {
   caosdb_connection_connection connection;
   int return_code(
-      caosdb_connection_connection_manager_get_default_connection(&connection));
+    caosdb_connection_connection_manager_get_default_connection(&connection));
   EXPECT_EQ(return_code, 0);
 
   caosdb_transaction_transaction transaction;
-  return_code = caosdb_connection_connection_create_transaction(&connection,
-                                                                &transaction);
+  return_code =
+    caosdb_connection_connection_create_transaction(&connection, &transaction);
   EXPECT_EQ(return_code, 0);
 
   return_code =
-      caosdb_transaction_transaction_retrieve_by_id(&transaction, "21");
+    caosdb_transaction_transaction_retrieve_by_id(&transaction, "21");
   EXPECT_EQ(return_code, caosdb::StatusCode::GO_ON);
 
   return_code = caosdb_transaction_transaction_execute(&transaction);
@@ -128,7 +128,7 @@ TEST(test_ccaosdb, test_single_id_retrieve) {
 
   caosdb_transaction_result_set result_set;
   return_code =
-      caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
+    caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
   EXPECT_EQ(return_code, 0);
 
   int dummy(-1);
@@ -145,8 +145,8 @@ TEST(test_ccaosdb, test_single_id_retrieve) {
   EXPECT_EQ(return_code, 0);
   EXPECT_EQ(*count, 0);
 
-  char out[255] = {"255"}; // NOLINT
-  return_code = caosdb_entity_entity_get_name(&entity, out);
+  char *out = nullptr; // NOLINT
+  return_code = caosdb_entity_entity_get_name(&entity, &out);
   EXPECT_EQ(return_code, 0);
   EXPECT_STREQ(out, "unit");
 
@@ -157,17 +157,17 @@ TEST(test_ccaosdb, test_single_id_retrieve) {
 TEST(test_ccaosdb, test_multi_id_retrieve) {
   caosdb_connection_connection connection;
   int return_code(
-      caosdb_connection_connection_manager_get_default_connection(&connection));
+    caosdb_connection_connection_manager_get_default_connection(&connection));
   EXPECT_EQ(return_code, 0);
 
   caosdb_transaction_transaction transaction;
-  return_code = caosdb_connection_connection_create_transaction(&connection,
-                                                                &transaction);
+  return_code =
+    caosdb_connection_connection_create_transaction(&connection, &transaction);
   EXPECT_EQ(return_code, 0);
 
   const char *ids[] = {"20", "21", "22"}; // NOLINT
   return_code =
-      caosdb_transaction_transaction_retrieve_by_ids(&transaction, ids, 3);
+    caosdb_transaction_transaction_retrieve_by_ids(&transaction, ids, 3);
   EXPECT_EQ(return_code, caosdb::StatusCode::GO_ON);
 
   return_code = caosdb_transaction_transaction_execute(&transaction);
@@ -176,7 +176,7 @@ TEST(test_ccaosdb, test_multi_id_retrieve) {
 
   caosdb_transaction_result_set result_set;
   return_code =
-      caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
+    caosdb_transaction_transaction_get_result_set(&transaction, &result_set);
   EXPECT_EQ(return_code, 0);
 
   int dummy(-1);
@@ -193,8 +193,8 @@ TEST(test_ccaosdb, test_multi_id_retrieve) {
   EXPECT_EQ(return_code, 0);
   EXPECT_EQ(*count, 0);
 
-  char out[255] = {"255"}; // NOLINT
-  return_code = caosdb_entity_entity_get_name(&entity, out);
+  char *out = nullptr; // NOLINT
+  return_code = caosdb_entity_entity_get_name(&entity, &out);
   EXPECT_EQ(return_code, 0);
   EXPECT_STREQ(out, "unit");