TST: Add test for PdfMerger

tests/test_merger.py

@@ -1,6 +1,8 @@
 import os
 import sys
 
+import pytest
+
 import PyPDF2
 from PyPDF2.generic import Destination
 
@@ -24,6 +26,7 @@ def test_merge():
     merger.append(outline)
     merger.append(pdf_path, pages=PyPDF2.pagerange.PageRange(slice(0, 0)))
     merger.append(pdf_forms)
+    merger.merge(0, pdf_path, import_bookmarks=False)
 
     # Merging an encrypted file
     reader = PyPDF2.PdfReader(pdf_pw)
@@ -92,3 +95,25 @@ def test_merge():
 
     # Clean up
     os.remove(tmp_path)
+
+
+def test_merge_page_exception():
+    merger = PyPDF2.PdfMerger()
+    pdf_path = os.path.join(RESOURCE_ROOT, "crazyones.pdf")
+    with pytest.raises(TypeError) as exc:
+        merger.merge(0, pdf_path, pages="a:b")
+    assert exc.value.args[0] == '"pages" must be a tuple of (start, stop[, step])'
+
+
+def test_merge_write_closed_fh():
+    merger = PyPDF2.PdfMerger()
+    pdf_path = os.path.join(RESOURCE_ROOT, "crazyones.pdf")
+    merger.append(pdf_path)
+
+    merger.close()
+    with pytest.raises(RuntimeError) as exc:
+        merger.write("stream.pdf")
+    assert (
+        exc.value.args[0]
+        == "close() was called and thus the writer cannot be used anymore"
+    )