tests: Test XML outputs

Load the outputs of the tests in Gtk.Builder and make sure they work.
Some of them don't and need to be fixed. Others will require a bit more
work to set up callbacks, templates, etc.

tests/samples/action_widgets.blp

@@ -1,6 +1,6 @@
 using Gtk 4.0;
 
-template MyDialog : Dialog {
+Dialog {
     [action response=cancel]
     Button cancel_button {
         label: _("Cancel");

tests/samples/action_widgets.ui

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk" version="4.0"/>
-  <template class="MyDialog" parent="GtkDialog">
+  <object class="GtkDialog">
     <child type="action">
       <object class="GtkButton" id="cancel_button">
         <property name="label" translatable="true">Cancel</property>
@@ -22,7 +22,7 @@
       <action-widget response="9">custom_response_button</action-widget>
       <action-widget response="ok" default="True">ok_button</action-widget>
     </action-widgets>
-  </template>
+  </object>
   <object class="GtkInfoBar">
     <child type="action">
       <object class="GtkButton" id="ok_info_button">

tests/samples/numbers.blp

@@ -2,6 +2,7 @@ using Gtk 4.0;
 
 Gtk.Label {
   xalign: .5;
-  margin-end: 1_000_000;
+  height-request: 1_000_000;
   margin-top: 0x30;
+
 }

tests/samples/numbers.ui

@@ -3,7 +3,7 @@
   <requires lib="gtk" version="4.0"/>
   <object class="GtkLabel">
     <property name="xalign">0.5</property>
-    <property name="margin-end">1000000</property>
+    <property name="height-request">1000000</property>
     <property name="margin-top">48</property>
   </object>
 </interface>

tests/samples/object_prop.blp

@@ -1,7 +1,7 @@
 using Gtk 4.0;
 
-template TestTemplate : Label {
-  test-property: Button {
-    label: "Hello, world!";
+Range {
+  adjustment: Adjustment {
+    lower: 10;
   };
 }

tests/samples/object_prop.ui

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk" version="4.0"/>
-  <template class="TestTemplate" parent="GtkLabel">
-    <property name="test-property">
-      <object class="GtkButton">
-        <property name="label">Hello, world!</property>
+  <object class="GtkRange">
+    <property name="adjustment">
+      <object class="GtkAdjustment">
+        <property name="lower">10</property>
       </object>
     </property>
-  </template>
+  </object>
 </interface>

tests/test_samples.py

@@ -20,9 +20,13 @@
 
 import difflib  # I love Python
 from pathlib import Path
-import traceback
 import unittest
 
+import gi
+
+gi.require_version("Gtk", "4.0")
+from gi.repository import Gtk
+
 from blueprintcompiler import tokenizer, parser, decompiler
 from blueprintcompiler.completions import complete
 from blueprintcompiler.errors import PrintableError, MultipleErrors, CompileError
@@ -40,7 +44,8 @@ class TestSamples(unittest.TestCase):
         for i in range(len(text)):
             list(complete(ast, tokens, i))
 
-    def assert_sample(self, name):
+    def assert_sample(self, name, skip_run=False):
+        print(f'assert_sample("{name}", skip_run={skip_run})')
         try:
             with open((Path(__file__).parent / f"samples/{name}.blp").resolve()) as f:
                 blueprint = f.read()
@@ -70,7 +75,12 @@ class TestSamples(unittest.TestCase):
             e.pretty_print(name + ".blp", blueprint)
             raise AssertionError()
 
+        # Make sure the sample runs
+        if not skip_run:
+            Gtk.Builder.new_from_string(actual, -1)
+
     def assert_sample_error(self, name):
+        print(f'assert_sample_error("{name}")')
         try:
             with open(
                 (Path(__file__).parent / f"sample_errors/{name}.blp").resolve()
@@ -115,6 +125,7 @@ class TestSamples(unittest.TestCase):
             raise AssertionError("Expected a compiler error, but none was emitted")
 
     def assert_decompile(self, name):
+        print(f'assert_decompile("{name}")')
         try:
             with open((Path(__file__).parent / f"samples/{name}.blp").resolve()) as f:
                 expected = f.read()
@@ -140,27 +151,37 @@ class TestSamples(unittest.TestCase):
         self.assert_sample("combo_box_text")
         self.assert_sample("comments")
         self.assert_sample("enum")
-        self.assert_sample("expr_lookup")
+        self.assert_sample("expr_lookup", skip_run=True)  # TODO: Fix
         self.assert_sample("file_filter")
-        self.assert_sample("flags")
+        self.assert_sample("flags", skip_run=True)  # TODO: Fix
         self.assert_sample("id_prop")
         self.assert_sample("layout")
-        self.assert_sample("menu")
+        self.assert_sample("menu", skip_run=True)  # TODO: Fix
         self.assert_sample("numbers")
         self.assert_sample("object_prop")
-        self.assert_sample("parseable")
+        self.assert_sample(
+            "parseable", skip_run=True
+        )  # The image resource doesn't exist
         self.assert_sample("property")
-        self.assert_sample("signal")
+        self.assert_sample("signal", skip_run=True)  # The callback doesn't exist
         self.assert_sample("size_group")
         self.assert_sample("string_list")
         self.assert_sample("strings")
         self.assert_sample("style")
-        self.assert_sample("template")
-        self.assert_sample("template_no_parent")
+        self.assert_sample(
+            "template", skip_run=True
+        )  # The template class doesn't exist
+        self.assert_sample(
+            "template_no_parent", skip_run=True
+        )  # The template class doesn't exist
         self.assert_sample("translated")
-        self.assert_sample("typeof")
+        self.assert_sample(
+            "typeof", skip_run=True
+        )  # The custom object type doesn't exist
         self.assert_sample("uint")
-        self.assert_sample("unchecked_class")
+        self.assert_sample(
+            "unchecked_class", skip_run=True
+        )  # The custom object type doesn't exist
         self.assert_sample("using")
 
     def test_sample_errors(self):