Test case for string formatting

src/ifcopenshell-python/test/instance_string_formatting.py

@@ -0,0 +1,17 @@
+import pytest
+import ifcopenshell
+
+def test_file_gc():
+    f = ifcopenshell.file()
+    inst = f.createIfcWall(ifcopenshell.guid.new(), Name=chr(0x1F37A))
+    # 0x1F37A should be encoded using X4
+    assert '\\X4\\' in inst.to_string()
+    # to_string() should use upper case entity names
+    assert 'IFCWALL' in inst.to_string()
+    # __str__ uses camel case entity names
+    assert 'IfcWall' in str(inst)
+    # in fact, __str__ is equal to to_string(False)
+    assert str(inst) == inst.to_string(False)
+
+if __name__ == "__main__":
+    pytest.main(["-sx", __file__])