diff --git a/codebleu/codebleu.py b/codebleu/codebleu.py
index f6d4bb3..76aa6b3 100644
--- a/codebleu/codebleu.py
+++ b/codebleu/codebleu.py
@@ -34,6 +34,7 @@ def calc_codebleu(
     Return:
         Scores dict
     """
+    assert len(references) == len(predictions), "Number of references and predictions should be the same"
     assert lang in AVAILABLE_LANGS, f"Language {lang} is not supported (yet). Available languages: {AVAILABLE_LANGS}"
     assert len(weights) == 4, "weights should be a tuple of 4 floats (alpha, beta, gamma, theta)"
     assert keywords_dir.exists(), f"keywords_dir {keywords_dir} does not exist"
@@ -43,9 +44,6 @@ def calc_codebleu(
     references = [[x.strip() for x in ref] if isinstance(ref, list) else [ref.strip()] for ref in references]
     hypothesis = [x.strip() for x in predictions]
 
-    if not len(references) == len(hypothesis):
-        raise ValueError
-
     # calculate ngram match (BLEU)
     if tokenizer is None:
 
diff --git a/setup.py b/setup.py
index c5b7ca5..1b0e285 100644
--- a/setup.py
+++ b/setup.py
@@ -7,9 +7,10 @@
 ROOT = Path(__file__).parent
 
 
-subprocess.check_call(
+subprocess.run(
     ['bash', 'build.sh'],
-    cwd=ROOT / 'codebleu' / 'parser'
+    cwd=ROOT / 'codebleu' / 'parser',
+    check=True,
 )
 
 
diff --git a/tests/test_codebleu.py b/tests/test_codebleu.py
index 8af38b4..1102415 100644
--- a/tests/test_codebleu.py
+++ b/tests/test_codebleu.py
@@ -25,6 +25,31 @@ def test_exact_match_works_for_all_langs(lang: str) -> None:
     assert calc_codebleu(references, predictions, lang)['codebleu'] == 1.0
 
 
+@pytest.mark.parametrize(['lang', 'predictions', 'references'], [
+    ('python', ['def foo ( x ) :\n    return x'], ['def bar ( y ) :\n    return y']),
+    ('java', ['public function foo ( x ) { return x }'], ['public function bar ( y ) {\n   return y\n}']),
+    ('javascript', ['function foo ( x ) { return x }'], ['function bar ( y ) {\n   return y\n}']),
+    ('c', ['int foo ( int x ) { return x }'], ['int bar ( int y ) {\n   return y\n}']),
+    ('c_sharp', ['public int foo ( int x ) { return x }'], ['public int bar ( int y ) {\n   return y\n}']),
+    ('cpp', ['int foo ( int x ) { return x }'], ['int bar ( int y ) {\n   return y\n}']),
+    ('php', ['function foo ( x ) { return x }'], ['function bar ( y ) {\n   return y\n}']),
+])
+def test_simple_cases_work_for_all_langs(lang: str, predictions: List[Any], references: List[Any]) -> None:
+    result = calc_codebleu(references, predictions, lang)
+    print(result)
+    assert result['codebleu'] == pytest.approx(0.6, 0.1)
+
+
+def test_error_when_lang_not_supported() -> None:
+    with pytest.raises(AssertionError):
+        calc_codebleu(['def foo : pass'], ['def bar : pass'], 'not_supported_lang')
+
+
+def test_error_when_input_length_mismatch() -> None:
+    with pytest.raises(AssertionError):
+        calc_codebleu(['def foo : pass'], ['def bar : pass', 'def buz : pass'], 'python')
+
+
 @pytest.mark.parametrize(['predictions', 'references', 'codebleu'], [
     (
         ['public static int Sign ( double d ) { return ( float ) ( ( d == 0 ) ? 0 : ( c < 0.0 ) ? - 1 : 1) ; }'],