[gtk/matthiasc/for-master] Add a test for constraints in ui files

[Matthias Clasen <matthiasc src gnome org>]

commit 505df337c2777d3772cb03a1d26d9dfc6417ca5c
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 30 16:17:38 2020 -0400

    Add a test for constraints in ui files
    
    Test the various values that are possible for the constraint
    attributes.

 testsuite/gtk/ui/constraints.expected |   1 +
 testsuite/gtk/ui/constraints.ui       | 107 ++++++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)
---
diff --git a/testsuite/gtk/ui/constraints.expected b/testsuite/gtk/ui/constraints.expected
new file mode 100644
index 0000000000..ff43ca4091
--- /dev/null
+++ b/testsuite/gtk/ui/constraints.expected
@@ -0,0 +1 @@
+SUCCESS
diff --git a/testsuite/gtk/ui/constraints.ui b/testsuite/gtk/ui/constraints.ui
new file mode 100644
index 0000000000..9dadad61e1
--- /dev/null
+++ b/testsuite/gtk/ui/constraints.ui
@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkWindow" id="window1">
+    <property name="title" translatable="yes">Constraints</property>
+    <child>
+      <object class="GtkBox">
+        <property name="layout-manager">
+          <object class="GtkConstraintLayout">
+            <constraints>
+              <guide name="space"
+                     min-width="10" min-height="10"
+                     nat-width="100" nat-height="10"
+                     max-width="200" max-height="20"
+                     strength="strong"/>
+              <constraint target="button1" target-attribute="width"
+                          relation="le"
+                          constant="200"
+                          multiplier="2.5"
+                          strength="required"/>
+              <constraint target="super" target-attribute="start"
+                          relation="eq"
+                          source="button1" source-attribute="start"
+                          constant="-8"
+                          multiplier="100"
+                          strength="strong"/>
+              <constraint target="button1" target-attribute="width"
+                          relation="eq"
+                          source="button2" source-attribute="left"
+                          strength="medium"/>
+              <constraint target="button1" target-attribute="end"
+                          relation="eq"
+                          source="space" source-attribute="right"
+                          strength="weak"/>
+              <constraint target="space" target-attribute="end"
+                          relation="eq"
+                          source="button2" source-attribute="center-x"
+                          strength="required"/>
+              <constraint target="super" target-attribute="center-y"
+                          relation="eq"
+                          source="button2" source-attribute="baseline"
+                          constant="8"
+                          strength="required"/>
+              <constraint target="super" target-attribute="start"
+                          relation="eq"
+                          source="button3" source-attribute="start"
+                          constant="-8"
+                          strength="required"/>
+              <constraint target="super" target-attribute="end"
+                          relation="eq"
+                          source="button3" source-attribute="end"
+                          constant="8"
+                          strength="required"/>
+              <constraint target="super" target-attribute="top"
+                          relation="eq"
+                          source="button1" source-attribute="top"
+                          constant="-8"
+                          strength="required"/>
+              <constraint target="super" target-attribute="top"
+                          relation="eq"
+                          source="button2" source-attribute="top"
+                          constant="-8"
+                          strength="required"/>
+              <constraint target="button1" target-attribute="bottom"
+                          relation="eq"
+                          source="button3" source-attribute="top"
+                          constant="-12"
+                          strength="required"/>
+              <constraint target="button2" target-attribute="bottom"
+                          relation="eq"
+                          source="button3" source-attribute="top"
+                          constant="-12"
+                          strength="required"/>
+              <constraint target="button3" target-attribute="height"
+                          relation="eq"
+                          source="button1" source-attribute="height"
+                          strength="required"/>
+              <constraint target="button3" target-attribute="height"
+                          relation="eq"
+                          source="button2" source-attribute="height"
+                          strength="required"/>
+              <constraint target="super" target-attribute="bottom"
+                          relation="eq"
+                          source="button3" source-attribute="bottom"
+                          constant="8"
+                          strength="required"/>
+            </constraints>
+          </object>
+        </property>
+        <child>
+          <object class="GtkButton" id="button1">
+            <property name="label">Child 1</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="button2">
+            <property name="label">Child 2</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="button3">
+            <property name="label">Child 3</property>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>