diff --git a/tests/06_codeblock_plain_bad.md b/tests/06_codeblock_plain_bad.md
new file mode 100644
index 0000000..e6fe613
--- /dev/null
+++ b/tests/06_codeblock_plain_bad.md
@@ -0,0 +1,7 @@
+# Bad plain code block
+
+This code block is not properly closed, and should fail
+
+```
+aaaa
+
diff --git a/tests/06_codeblock_plain_good.md b/tests/06_codeblock_plain_good.md
new file mode 100644
index 0000000..c0b8486
--- /dev/null
+++ b/tests/06_codeblock_plain_good.md
@@ -0,0 +1,8 @@
+# Good plain code block
+
+This code block has no language tagged will not be checked.
+
+```
+aaaa
+```
+