Add minimal transaction log parsing tests

tests/CMakeLists.txt

@@ -9,6 +9,7 @@ set(SOURCES
     main.cpp
     parser.cpp
     results.cpp
+    transaction_log_parsing.cpp
     util/test_file.cpp
 )
 

tests/transaction_log_parsing.cpp

@@ -0,0 +1,86 @@
+#include "catch.hpp"
+
+#include "util/test_file.hpp"
+
+#include "impl/realm_coordinator.hpp"
+#include "impl/transact_log_handler.hpp"
+#include "property.hpp"
+#include "object_schema.hpp"
+#include "schema.hpp"
+
+#include <realm/commit_log.hpp>
+#include <realm/group_shared.hpp>
+
+using namespace realm;
+
+TEST_CASE("Transaction log parsing") {
+    InMemoryTestFile path;
+    Realm::Config config = path;
+
+    SECTION("schema change validation") {
+        config.schema = std::make_unique<Schema>(Schema{
+            {"table", "", {
+                {"unindexed", PropertyTypeInt},
+                {"indexed", PropertyTypeInt, "", false, true}
+            }},
+        });
+        auto r = Realm::get_shared_realm(std::move(config));
+        r->read_group();
+
+        auto history = make_client_history(config.path);
+        SharedGroup sg(*history, SharedGroup::durability_MemOnly);
+
+        SECTION("adding a table is allowed") {
+            WriteTransaction wt(sg);
+            TableRef table = wt.add_table("new table");
+            table->add_column(type_String, "new col");
+            wt.commit();
+
+            REQUIRE_NOTHROW(r->refresh());
+        }
+
+        SECTION("adding an index to an existing column is allowed") {
+            WriteTransaction wt(sg);
+            TableRef table = wt.get_table("class_table");
+            table->add_search_index(0);
+            wt.commit();
+
+            REQUIRE_NOTHROW(r->refresh());
+        }
+
+        SECTION("removing an index from an existing column is allowed") {
+            WriteTransaction wt(sg);
+            TableRef table = wt.get_table("class_table");
+            table->remove_search_index(1);
+            wt.commit();
+
+            REQUIRE_NOTHROW(r->refresh());
+        }
+
+        SECTION("adding a column to an existing table is not allowed (but eventually should be)") {
+            WriteTransaction wt(sg);
+            TableRef table = wt.get_table("class_table");
+            table->add_column(type_String, "new col");
+            wt.commit();
+
+            REQUIRE_THROWS(r->refresh());
+        }
+
+        SECTION("removing a column is not allowed") {
+            WriteTransaction wt(sg);
+            TableRef table = wt.get_table("class_table");
+            table->remove_column(1);
+            wt.commit();
+
+            REQUIRE_THROWS(r->refresh());
+        }
+
+        SECTION("removing a table is not allowed") {
+            WriteTransaction wt(sg);
+            wt.get_group().remove_table("class_table");
+            wt.commit();
+
+            REQUIRE_THROWS(r->refresh());
+        }
+    }
+}