GH-127488: Add tests for the file - msgfmt.py file in Tools/i18n/msgfmt

Lib/test/test_tools/test_msgfmt.py

@@ -0,0 +1,70 @@
+import unittest
+import os
+import tempfile
+from test.test_tools import imports_under_tool, skip_if_missing
+
+skip_if_missing("i18n")
+with imports_under_tool("i18n"):
+    from msgfmt import make
+
+
+class TestMsgfmt(unittest.TestCase):
+
+    def setUp(self):
+        self.test_dir = tempfile.TemporaryDirectory()
+        self.addCleanup(self.test_dir.cleanup)
+
+    def create_po_file(self, content):
+        po_file_path = os.path.join(self.test_dir.name, "test.po")
+        with open(po_file_path, "w", encoding="utf-8") as f:
+            f.write(content)
+        return po_file_path
+
+    def test_make_creates_mo_file(self):
+        po_content = """
+        msgid ""
+        msgstr ""
+        "Content-Type: text/plain; charset=UTF-8\\n"
+
+        msgid "Hello"
+        msgstr "Bonjour"
+        """
+        po_file = self.create_po_file(po_content)
+        mo_file = os.path.splitext(po_file)[0] + ".mo"
+
+        make(po_file, mo_file)
+
+        self.assertTrue(os.path.exists(mo_file))
+
+    def test_make_handles_fuzzy(self):
+        po_content = """
+        msgid ""
+        msgstr ""
+        "Content-Type: text/plain; charset=UTF-8\\n"
+
+        #, fuzzy
+        msgid "Hello"
+        msgstr "Bonjour"
+        """
+        po_file = self.create_po_file(po_content)
+        mo_file = os.path.splitext(po_file)[0] + ".mo"
+
+        make(po_file, mo_file)
+
+        self.assertTrue(os.path.exists(mo_file))
+
+    def test_make_invalid_po_file(self):
+        po_content = """
+        msgid "Hello"
+        msgstr "Bonjour"
+        msgid_plural "Hellos"
+        """
+        po_file = self.create_po_file(po_content)
+        mo_file = os.path.splitext(po_file)[0] + ".mo"
+
+        with self.assertRaises(SystemExit):
+            make(po_file, mo_file)
+
+
+if __name__ == "__main__":
+    unittest.main()