[designspace] Update test to exercise multiple <mappings>

Tests/designspaceLib/data/test_avar2.designspace

@@ -19,8 +19,8 @@
       <map input="87.5" output="89"/>
       <map input="100" output="100"/>
     </axis>
-    <mappings description="all mappings">
-      <mapping description="test mapping">
+    <mappings description="mappings 1">
+      <mapping description="justify low">
         <input>
 	  <dimension name="Justify" xvalue="-100"/>
 	  <dimension name="Width" xvalue="100"/>
@@ -30,6 +30,17 @@
         </output>
       </mapping>
     </mappings>
+    <mappings description="mappings 2">
+      <mapping description="test mapping">
+        <input>
+	  <dimension name="Justify" xvalue="100"/>
+	  <dimension name="Width" xvalue="70"/>
+        </input>
+        <output>
+	  <dimension name="Width" xvalue="100"/>
+        </output>
+      </mapping>
+    </mappings>
   </axes>
   <variable-fonts>
     <variable-font name="NotoSansArabic_Justify_Width">

Tests/designspaceLib/designspace_test.py

@@ -701,7 +701,7 @@ def test_axisMappingsRoundtrip(tmpdir):
     doc = DesignSpaceDocument()
     doc.read(testDocPath)
     assert doc.axisMappings
-    assert len(doc.axisMappings) == 1
+    assert len(doc.axisMappings) == 2
     assert doc.axisMappings[0].inputLocation == {"Justify": -100.0, "Width": 100.0}
 
     # This is a bit of a hack, but it's the only way to make sure

Tests/designspaceLib/split_test.py

@@ -217,13 +217,13 @@ def test_avar2(datadir):
     ds = DesignSpaceDocument()
     ds.read(datadir / "test_avar2.designspace")
     _, subDoc = next(splitInterpolable(ds))
-    assert len(subDoc.axisMappings) == 1
+    assert len(subDoc.axisMappings) == 2
 
     subDocs = list(splitVariableFonts(ds))
     assert len(subDocs) == 5
     for i, (_, subDoc) in enumerate(subDocs):
         # Only the first one should have a mapping, according to the document
         if i == 0:
-            assert len(subDoc.axisMappings) == 1
+            assert len(subDoc.axisMappings) == 2
         else:
             assert len(subDoc.axisMappings) == 0