diff --git a/tests/test_lex_key_comment.cpp b/tests/test_lex_key_comment.cpp
index 2598c64..be4b176 100644
--- a/tests/test_lex_key_comment.cpp
+++ b/tests/test_lex_key_comment.cpp
@@ -32,7 +32,15 @@ BOOST_AUTO_TEST_CASE(test_dotted_key)
 {
     TOML11_TEST_LEX_ACCEPT(lex_key, "physical.color", "physical.color");
     TOML11_TEST_LEX_ACCEPT(lex_key, "physical.shape", "physical.shape");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x.y", "x.y");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x . y", "x . y");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x.y.z", "x.y.z");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x. y .z", "x. y .z");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x .y. z", "x .y. z");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x . y . z", "x . y . z");
     TOML11_TEST_LEX_ACCEPT(lex_key, "x.y.z.w", "x.y.z.w");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x. y .z. w", "x. y .z. w");
+    TOML11_TEST_LEX_ACCEPT(lex_key, "x . y . z . w", "x . y . z . w");
     TOML11_TEST_LEX_ACCEPT(lex_key, "site.\"google.com\"", "site.\"google.com\"");
 }