diff --git a/crates/typos-cli/tests/cmd/config-disallowed.in/_typos.toml b/crates/typos-cli/tests/cmd/config-disallowed.in/_typos.toml
new file mode 100644
index 0000000..56a17b6
--- /dev/null
+++ b/crates/typos-cli/tests/cmd/config-disallowed.in/_typos.toml
@@ -0,0 +1,2 @@
+[default.extend-identifiers]
+hello = ""
diff --git a/crates/typos-cli/tests/cmd/config-disallowed.in/file b/crates/typos-cli/tests/cmd/config-disallowed.in/file
new file mode 100644
index 0000000..b4cfe09
--- /dev/null
+++ b/crates/typos-cli/tests/cmd/config-disallowed.in/file
@@ -0,0 +1 @@
+hello `hello`
diff --git a/crates/typos-cli/tests/cmd/config-disallowed.toml b/crates/typos-cli/tests/cmd/config-disallowed.toml
new file mode 100644
index 0000000..e484ec5
--- /dev/null
+++ b/crates/typos-cli/tests/cmd/config-disallowed.toml
@@ -0,0 +1,17 @@
+bin.name = "typos"
+stdin = ""
+stdout = """
+error: `hello` is disallowed
+  --> ./file:1:1
+  |
+1 | hello `hello`
+  | ^^^^^
+  |
+error: `hello` is disallowed
+  --> ./file:1:8
+  |
+1 | hello `hello`
+  |        ^^^^^
+  |
+"""
+stderr = ""