BuildingSmart IFCRail changes to BIMTester (#1309)

* Add a way to validate the IFC file in BIMTester

* Fix an issue in Report where only the first error was shown

* Fix the usage of Schema in BIMTester

* Add Aggreation steps to BIMTester

src/ifcbimtester/bimtester/util.py

@@ -1,8 +1,29 @@
 import ifcopenshell
 import ifcopenshell.util.element
+import ifcopenshell.validate
+import json
 from bimtester.lang import _
 
 
+def by_types(ifc, ifc_types):
+    elements = []
+    for ifc_type in ifc_types.split(","):
+        elements += ifc.by_type(ifc_type.strip())
+    return elements
+
+
+def validate(ifc):
+    errors = []
+    logger = ifcopenshell.validate.json_logger()
+    try:
+        ifcopenshell.validate.validate(ifc, logger)
+        if logger.statements:
+            for statement in logger.statements:
+                errors.append(f"{json.dumps(statement, default=str)}")
+    except RuntimeError as error:
+        assert False, str(error)
+
+
 def assert_guid(ifc, guid):
     try:
         return ifc.by_guid(guid)