Support resdata 6 and 7 GRDECL writers

pyproject.toml

@@ -43,6 +43,7 @@ dependencies = [
     "resfo-utilities>=0.1.1",
     "polars",
     "fastexcel",
+    "packaging>=26.3",
 ]
 [dependency-groups]
 dev = [

tests/conftest.py

@@ -2,15 +2,19 @@
 import os
 import shutil
 import subprocess
+from importlib.metadata import version
 from pathlib import Path
 
-import cwrap
 import pytest
 from hypothesis import HealthCheck, settings
+from packaging.version import Version
 from resdata import ResDataType
 from resdata.grid import GridGenerator
 from resdata.resfile import ResdataKW
 
+if Version(version("resdata")).major < 7:
+    import cwrap
+
 from tests import legacy_test_data
 
 # Timeout settings are unreliable both on CI and
@@ -121,7 +125,11 @@ def fixture_grid_prop():
     def wrapper(prop_name, value, grid_size, fname):
         prop = ResdataKW(prop_name, grid_size, ResDataType.RD_FLOAT)
         prop.assign(value)
-        with cwrap.open(fname, "w") as file:
-            prop.write_grdecl(file)
+        if Version(version("resdata")).major < 7:
+            with cwrap.open(fname, "w") as file:
+                prop.write_grdecl(file)
+        else:
+            with Path(fname).open(mode="w", encoding="utf-8") as file:
+                prop.write_grdecl(file)
 
     return wrapper