Add test

Author: hankluo6

tests/errors/test_literal.py

@@ -0,0 +1,2 @@
+def test_literal1():
+    x: i32 = 0123

tests/reference/tokens-test_literal-e20c024.json

@@ -0,0 +1,13 @@
+{
+    "basename": "tokens-test_literal-e20c024",
+    "cmd": "lpython --no-color --show-tokens {infile} -o {outfile}",
+    "infile": "tests/errors/test_literal.py",
+    "infile_hash": "ac9e219faa40c6554983087e8ac198c323f2e5af284b8689f5608f76",
+    "outfile": null,
+    "outfile_hash": null,
+    "stdout": null,
+    "stdout_hash": null,
+    "stderr": "tokens-test_literal-e20c024.stderr",
+    "stderr_hash": "58fe8b74550bd6f81761b173626f3d45eaae346665862f1b085eebe8",
+    "returncode": 1
+}

tests/reference/tokens-test_literal-e20c024.stderr

@@ -0,0 +1,5 @@
+tokenizer error: Leading zeros in decimal integer are not allowed
+ --> tests/errors/test_literal.py:2:14
+  |
+2 |     x: i32 = 0123
+  |              ^^^^ 

tests/tests.toml

@@ -1197,6 +1197,10 @@ tokens = true
 filename = "tokens/errors/indent3.py"
 tokens = true
 
+[[test]]
+filename = "errors/test_literal.py"
+tokens = true
+
 [[test]]
 filename = "errors/kwargs_01_error.py"
 asr = true