Add cli tests for error

mythril/interfaces/cli.py

@@ -215,12 +215,6 @@ def create_leveldb_parser(parser: argparse.ArgumentParser):
     )
 
 
-def create_version_parser(hash_parser: argparse.ArgumentParser):
-    hash_parser.add_argument(
-        "version", help="print the Mythril version number and exit", metavar="VERSION"
-    )
-
-
 def create_func_to_hash_parser(hash_parser: argparse.ArgumentParser):
     hash_parser.add_argument(
         "func_name", help="calculate function signature hash", metavar="SIGNATURE"

tests/cli_tests/cmd_line_test.py

@@ -27,6 +27,19 @@ class CommandLineToolTestCase(BaseTestCase):
         command = "python3 {} function-to-hash 'setOwner(address)'".format(MYTH)
         self.assertIn("0x13af4035\n", output_of(command))
 
+    def test_failure_json(self):
+        command = "python3 {} analyze doesnt_exist.sol -o json".format(MYTH)
+        print(output_of(command))
+        self.assertIn(""""success": false""", output_of(command))
+
+    def test_failure_text(self):
+        command = "python3 {} analyze doesnt_exist.sol".format(MYTH)
+        assert output_of(command) == ""
+
+    def test_failure_jsonv2(self):
+        command = "python3 {} analyze doesnt_exist.sol -o jsonv2".format(MYTH)
+        self.assertIn(""""level": "error""" "", output_of(command))
+
 
 class TruffleTestCase(BaseTestCase):
     def test_analysis_truffle_project(self):