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Signed-off-by: András Schmelczer <andras@schmelczer.dev>

good_ai/tests/sus/test_language.py

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+import unittest
+
+from src.sus.language import english_name_of_language, is_english, predict_language
+
+
+class TestLanguage(unittest.TestCase):
+    def test_predict_language(self) -> None:
+        self.assertEqual(predict_language("This is an English text."), "en")
+        self.assertEqual(predict_language("Ez egy magyar szöveg."), "hu")
+        self.assertEqual(predict_language("此處按原典，應為「黃武元年」，而電子稿此處為「黃初元年」。"), "zh-TW")
+        self.assertEqual(predict_language("32"), "und")
+        self.assertEqual(predict_language(""), "und")
+
+    def test_is_english(self) -> None:
+        self.assertTrue(is_english("en"))
+        self.assertTrue(is_english("en-US"))
+        self.assertFalse(is_english("hu"))
+        self.assertFalse(is_english("de"))
+        self.assertFalse(is_english("zh"))
+        self.assertFalse(is_english("zh-TW"))
+        self.assertFalse(is_english("und"))
+        self.assertFalse(is_english(""))
+        self.assertFalse(is_english(None))
+
+    def english_name_of_language(self) -> None:
+        self.assertEqual(english_name_of_language("en"), "English")
+        self.assertEqual(english_name_of_language("hu"), "Hungarian")
+        self.assertEqual(english_name_of_language("zh"), "Chinese")
+        self.assertEqual(english_name_of_language("zh-TW"), "Chinese")
+        self.assertEqual(english_name_of_language("und"), "Unknown language")
+        self.assertEqual(english_name_of_language(""), "Unknown language")
+        self.assertEqual(english_name_of_language(None), "Unknown language")