tests: add tests for action widget syntax

tests/sample_errors/action_widget_float_response.blp

@@ -0,0 +1,8 @@
+using Gtk 4.0;
+
+Dialog {
+    [action response=17.9]
+    Button float_response_button {
+
+    }
+}

tests/sample_errors/action_widget_float_response.err

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+4,22,4,Response type must be GtkResponseType member or integer, not float

tests/sample_errors/action_widget_have_no_id.blp

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+using Gtk 4.0;
+
+Dialog {
+    [action response=cancel]
+    Button {
+        label: _("Cancel");
+    }
+}

tests/sample_errors/action_widget_have_no_id.err

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+4,13,15,Action widget must have ID

tests/sample_errors/action_widget_multiple_default.blp

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+using Gtk 4.0;
+
+Dialog {
+    [action response=yes default]
+    Button yes_button {
+
+    }
+
+    [action response=no default]
+    Button no_button {
+
+    }
+}

tests/sample_errors/action_widget_multiple_default.err

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+9,25,7,Default response is already set

tests/sample_errors/action_widget_negative_response.blp

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+using Gtk 4.0;
+
+Dialog {
+    [action response = -179]
+    Button numeric_response_button {
+
+    }
+}

tests/sample_errors/action_widget_negative_response.err

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+4,24,4,Numeric response type can't be negative

tests/sample_errors/action_widget_not_action.blp

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+using Gtk 4.0;
+
+Dialog {
+    [some_type response=ok]
+    Button ok_button {
+
+    }
+}

tests/sample_errors/action_widget_not_action.err

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+4,16,11,Only action widget can have response ID

tests/sample_errors/action_widget_not_in_dialog.blp

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+using Gtk 4.0;
+
+Box {
+    [action response=ok]
+    Button ok_button {
+
+    }
+}

tests/sample_errors/action_widget_not_in_dialog.err

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+4,13,11,Gtk.Box is not a Gtk.Dialog, so it doesn't have action widgets

tests/sample_errors/action_widget_response_dne.blp

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+using Gtk 4.0;
+
+Dialog {
+    [action response=hello-world]
+    Button hello_world_button {
+
+    }
+}

tests/sample_errors/action_widget_response_dne.err

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+4,22,11,Response type "hello-world" doesn't exist