Adding tests

tests/test_black.py

@@ -2198,6 +2198,26 @@ def test_code_option_parent_config(self) -> None:
                     call_args[0].lower() == str(pyproject_path).lower()
                 ), "Incorrect config loaded."
 
+    def test_code_with_unexpected_eof_error(self) -> None:
+        """
+        Test that Unexpected EOF error is raised with invalid code
+        """
+        code = "print("
+        args = ["--check", "--code", code]
+        error_msg = "error: cannot format <string>: Cannot parse: 2:0: Unexpected EOF\n"
+        result = CliRunner().invoke(black.main, args)
+        self.compare_results(result, error_msg, 123)
+
+    def test_invalid_input_parsing_error(self) -> None:
+        """
+        Test with invalid code which throws parsing error
+        """
+        code = "print([)"
+        args = ["--check", "--code", code]
+        error_msg = f"error: cannot format <string>: Cannot parse: 1:7: {code}\n"
+        result = CliRunner().invoke(black.main, args)
+        self.compare_results(result, error_msg, 123)
+
 
 with open(black.__file__, "r", encoding="utf-8") as _bf:
     black_source_lines = _bf.readlines()