Fix usage of default

Signed-off-by: Erik Jaegervall <[email protected]>

src/vss_tools/model.py

@@ -198,6 +198,14 @@ def check_type_default_consistency(self) -> Self:
         is consistent with the given datatype
         """
         if self.default is not None:
+            if Datatypes.get_type(self.datatype) is None:
+                # Default for custom datatypes only allowed for the special case that the datatype is an array
+                # and the default value is []
+                # See rules at https://github.com/COVESA/vehicle_signal_specification/blob/master/docs-gen/content/rule_set/data_entry/data_types_struct.md#default-values # noqa: E501
+                assert (
+                    self.datatype.endswith("[]") and not self.default
+                ), f"Default values not allowed for user defined type '{self.datatype}'"
+
             if is_array(self.datatype):
                 assert isinstance(
                     self.default, list

tests/vspec/test_structs/test_data_type_parsing.py

@@ -362,3 +362,42 @@ def test_data_types_for_multiple_apigear_templates(tmp_path):
     expected_output = HERE / "out.apigear"
     dcmp = filecmp.dircmp(out, expected_output)
     assert not (dcmp.diff_files or dcmp.left_only or dcmp.right_only)
+
+
+@pytest.mark.parametrize("file", ["test_struct_default.vspec", "test_struct_default_array.vspec"])
+def test_error_default_for_struct(tmp_path, file):
+    """
+    Test that we get an error if trying to use default for struct
+    """
+    vspec = HERE / file
+    types_file = HERE / "VehicleDataTypes.vspec"
+    out = tmp_path / "out.json"
+    cmd = (
+        f"vspec export json -u {TEST_UNITS} -q {TEST_QUANT} --pretty --vspec {vspec} "
+        f"--output {out} --types {types_file}"
+    )
+    env = os.environ.copy()
+    env["COLUMNS"] = "200"
+    process = subprocess.run(cmd.split(), capture_output=True, text=True, env=env)
+    assert process.returncode != 0
+
+    # Only checking first of type name to be able to handle both test cases
+    error_msg = "Default values not allowed for user defined type 'VehicleDataTypes.TestBranch1.ParentStruct"
+    assert error_msg in process.stdout
+
+
+def test_error_default_for_struct_array_empty(tmp_path):
+    """
+    Test that we get an error if trying to use default for struct
+    """
+    vspec = HERE / "test_struct_default_array_empty.vspec"
+    types_file = HERE / "VehicleDataTypes.vspec"
+    out = tmp_path / "out.json"
+    cmd = (
+        f"vspec export json -u {TEST_UNITS} -q {TEST_QUANT} --pretty --vspec {vspec} "
+        + f"--output {out} --types {types_file}"
+    )
+    env = os.environ.copy()
+    env["COLUMNS"] = "200"
+    process = subprocess.run(cmd.split(), capture_output=True, text=True, env=env)
+    assert process.returncode == 0

tests/vspec/test_structs/test_struct_default.vspec

@@ -0,0 +1,12 @@
+#
+A:
+  type: branch
+  description: Branch A.
+
+
+A.ParentStructSensor:
+  datatype: VehicleDataTypes.TestBranch1.ParentStruct
+  type: sensor
+  default: "No we do not allow default"
+  description: A rich sensor with user-defined data type.
+  comment: "See https://covesa.github.io/vehicle_signal_specification/rule_set/data_entry/data_types_struct/index.html#default-values"

tests/vspec/test_structs/test_struct_default_array.vspec

@@ -0,0 +1,13 @@
+#
+A:
+  type: branch
+  description: Branch A.
+
+# Default allowed for array type if default is empty
+
+A.ParentStructSensor:
+  datatype: VehicleDataTypes.TestBranch1.ParentStruct[]
+  type: sensor
+  default: "Only empty array allowed here"
+  description: A rich sensor with user-defined data type.
+  comment: "See https://covesa.github.io/vehicle_signal_specification/rule_set/data_entry/data_types_struct/index.html#default-values"

tests/vspec/test_structs/test_struct_default_array_empty.vspec

@@ -0,0 +1,13 @@
+#
+A:
+  type: branch
+  description: Branch A.
+
+# Default allowed for array type if default is empty
+
+A.ParentStructSensor:
+  datatype: VehicleDataTypes.TestBranch1.ParentStruct[]
+  type: sensor
+  default: []
+  description: A rich sensor with user-defined data type.
+  comment: "See https://covesa.github.io/vehicle_signal_specification/rule_set/data_entry/data_types_struct/index.html#default-values"