Add testing for StringDefinition validator

tests/ert/unit_tests/gui/ide/test_string_definition_argument.py

@@ -0,0 +1,29 @@
+from ert.validation import StringDefinition
+
+
+def test_validate_success_with_all_required_tokens():
+    string_def = StringDefinition(required=["token1", "token2"], invalid=["invalid1"])
+    validation_status = string_def.validate("This is a string with token1 and token2")
+    assert bool(validation_status) is True
+    assert validation_status.message() == ""
+
+
+def test_validate_success_with_required_tokens():
+    string_def = StringDefinition(required=["token1", "token2"], invalid=["invalid1"])
+    validation_status = string_def.validate("This is a string with token1 and token2")
+    assert bool(validation_status) is True
+    assert validation_status.message() == ""
+
+
+def test_validate_failure_with_empty_required_tokens():
+    string_def = StringDefinition(optional=False, required=[], invalid=["invalid1"])
+    validation_status = string_def.validate("This is a string with invalid1")
+    assert bool(validation_status) is False
+    assert validation_status.message() == "Contains invalid string invalid1!"
+
+
+def test_validate_empty_string():
+    string_def = StringDefinition(required=["token1"], invalid=["invalid1"])
+    validation_status = string_def.validate("")
+    assert bool(validation_status) is False
+    assert "Missing required token1!" in validation_status.message()