Fix broken tts:textShadow unit tests

Author: palemieux

src/test/python/test_imsc11text_filter.py

@@ -216,19 +216,18 @@ def test_line_padding_c_passes(self):
   def test_text_shadow_5_shadows_raises(self):
     doc = _make_simple_doc()
     body = doc.get_body()
-    for element in body.dfs_iterator():
-      if isinstance(element, model.Span):
-        shadow = styles.TextShadowType.Shadow(
-          x_offset=styles.LengthType(1, styles.LengthType.Units.pct),
-          y_offset=styles.LengthType(1, styles.LengthType.Units.pct),
-        )
-        element.set_style(
-          styles.StyleProperties.TextShadow,
-          styles.TextShadowType(shadows=(shadow, shadow, shadow, shadow, shadow)),
-        )
-
     with self.assertRaises(ValueError):
-      IMSC11TextFilter().process(doc)
+      for element in body.dfs_iterator():
+        if isinstance(element, model.Span):
+          shadow = styles.TextShadowType.Shadow(
+            x_offset=styles.LengthType(1, styles.LengthType.Units.pct),
+            y_offset=styles.LengthType(1, styles.LengthType.Units.pct),
+          )
+          element.set_style(
+            styles.StyleProperties.TextShadow,
+            styles.TextShadowType(shadows=(shadow, shadow, shadow, shadow, shadow)),
+          )
+        IMSC11TextFilter().process(doc)
 
   def test_text_shadow_4_shadows_passes(self):
     doc = _make_simple_doc()

src/test/python/test_model_style_properties.py

@@ -29,7 +29,7 @@
 
 import unittest
 from ttconv import model
-from ttconv.style_properties import ExtentType, LengthType, StyleProperties
+from ttconv.style_properties import ExtentType, LengthType, StyleProperties, TextShadowType
 
 class TestModelStyleProperties(unittest.TestCase):
 
@@ -38,6 +38,18 @@ def test_make_initial(self):
       with self.subTest(style.__name__):
         style.validate(style.make_initial_value())
 
+  def test_text_shadow_5_shadows_raises(self):
+    span = model.Span()
+    with self.assertRaises(ValueError):
+      shadow = TextShadowType.Shadow(
+        x_offset=LengthType(1, LengthType.Units.pct),
+        y_offset=LengthType(1, LengthType.Units.pct),
+      )
+      span.set_style(
+        StyleProperties.TextShadow,
+        TextShadowType(shadows=(shadow, shadow, shadow, shadow, shadow)),
+      )
+
   def test_extent_c_fail(self):
     doc = model.ContentDocument()