Add test for ERB.lex(nil)

Author: marcoroth

ext/erbx/test/lexer/tags_test.rb

@@ -4,6 +4,16 @@
 
 module Lexer
   class TagsTest < Minitest::Spec
+    test "nil" do
+      result = ERBX.lex(nil)
+
+      expected = %w[
+        TOKEN_EOF
+      ]
+
+      assert_equal expected, result.array.items.map(&:type)
+    end
+
     test "empty file" do
       result = ERBX.lex("")
 

src/lexer.c

@@ -12,6 +12,8 @@ static size_t lexer_sizeof(void) {
 }
 
 lexer_T* lexer_init(char* source) {
+  if (source == NULL) source = "";
+
   lexer_T* lexer = calloc(1, lexer_sizeof());
 
   lexer->state = STATE_DATA;