From 054307b6c99ab962cfa9bcb4c4d50f3aea5406ea Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Mon, 9 May 2022 23:52:56 +0900
Subject: Make the identifier format strict

---
 spec/lexer_test.go | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

(limited to 'spec/lexer_test.go')

diff --git a/spec/lexer_test.go b/spec/lexer_test.go
index 0e7cc89..5f555ec 100644
--- a/spec/lexer_test.go
+++ b/spec/lexer_test.go
@@ -120,9 +120,39 @@ bar // This is the fourth comment.
 			},
 		},
 		{
-			caption: "identifiers beginning with an underscore are not allowed because they are used only auto-generated identifiers",
+			caption: "an identifier cannot contain the capital-case letters",
+			src:     `Abc`,
+			err:     synErrIDInvalidChar,
+		},
+		{
+			caption: "an identifier cannot contain the capital-case letters",
+			src:     `Zyx`,
+			err:     synErrIDInvalidChar,
+		},
+		{
+			caption: "the underscore cannot be placed at the beginning of an identifier",
 			src:     `_abc`,
-			err:     synErrAutoGenID,
+			err:     synErrIDInvalidUnderscorePos,
+		},
+		{
+			caption: "the underscore cannot be placed at the end of an identifier",
+			src:     `abc_`,
+			err:     synErrIDInvalidUnderscorePos,
+		},
+		{
+			caption: "the underscore cannot be placed consecutively",
+			src:     `a__b`,
+			err:     synErrIDConsecutiveUnderscores,
+		},
+		{
+			caption: "the digits cannot be placed at the biginning of an identifier",
+			src:     `0abc`,
+			err:     synErrIDInvalidDigitsPos,
+		},
+		{
+			caption: "the digits cannot be placed at the biginning of an identifier",
+			src:     `9abc`,
+			err:     synErrIDInvalidDigitsPos,
 		},
 		{
 			caption: "an unclosed terminal is not a valid token",
-- 
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