Support overwriting embedded style map

1 files changed, 32 insertions, 2 deletions

diff --git a/tests/docx/style_map_tests.py b/tests/docx/style_map_tests.py
index f298e1d..5cf2292 100644
--- a/tests/docx/style_map_tests.py
+++ b/tests/docx/style_map_tests.py
@@ -1,4 +1,5 @@
 import io
+from zipfile import ZipFile
 
 from nose.tools import istest, assert_equal
 
@@ -13,6 +14,13 @@ def reading_embedded_style_map_on_document_without_embedded_style_map_returns_no
 
 
 @istest
+def writing_style_map_preserves_unrelated_files():
+    fileobj = _normal_docx()
+    write_style_map(fileobj, "p => h1")
+    with open_zip(fileobj, "r") as zip_file:
+        assert_equal("placeholder", zip_file.read_str("placeholder"))
+
+@istest
 def embedded_style_map_can_be_read_after_being_written():
     fileobj = _normal_docx()
     write_style_map(fileobj, "p => h1")
@@ -27,8 +35,30 @@ def embedded_style_map_is_written_to_separate_file():
         assert_equal("p => h1", zip_file.read_str("mammoth/style-map"))
 
 
+@istest
+def can_overwrite_existing_style_map():
+    fileobj = _normal_docx()
+    write_style_map(fileobj, "p => h1")
+    write_style_map(fileobj, "p => h2")
+    with open_zip(fileobj, "r") as zip_file:
+        assert_equal("p => h2", read_style_map(fileobj))
+        _assert_no_duplicates(zip_file._zip_file.namelist())
+
+
 def _normal_docx():
     fileobj = io.BytesIO()
-    with open_zip(fileobj, "w") as zip_file:
-        zip_file.write_str("placeholder", "placeholder")
+    zip_file = ZipFile(fileobj, "w")
+    try:
+        zip_file.writestr("placeholder", "placeholder")
+    finally:
+        zip_file.close()
     return fileobj
+
+
+def _assert_no_duplicates(values):
+    counts = {}
+    for value in values:
+        counts[value] = counts.get(value, 0) + 1
+    for value, count in counts.items():
+        if count != 1:
+            assert False, "{0} has count of {1}".format(value, count)