diff --git a/cli/tests/runner.rs b/cli/tests/runner.rs
index f63f126599..3c88f27983 100644
--- a/cli/tests/runner.rs
+++ b/cli/tests/runner.rs
@@ -63,6 +63,7 @@ mod test_revset_output;
 mod test_root;
 mod test_shell_completion;
 mod test_show_command;
+mod test_sign_command;
 mod test_simplify_parents_command;
 mod test_sparse_command;
 mod test_split_command;
diff --git a/cli/tests/test_sign_command.rs b/cli/tests/test_sign_command.rs
new file mode 100644
index 0000000000..05ffd9fdfe
--- /dev/null
+++ b/cli/tests/test_sign_command.rs
@@ -0,0 +1,117 @@
+// Copyright 2023 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crate::common::TestEnvironment;
+
+#[test]
+fn test_sign() {
+    let test_env = TestEnvironment::default();
+
+    test_env.add_config(
+        r#"
+[signing]
+show-signatures = true
+sign-all = false
+backend = "test"
+"#,
+    );
+
+    test_env.jj_cmd_ok(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "init"]);
+
+    let show_no_sig = test_env.jj_cmd_success(&repo_path, &["show", "-r", "@-"]);
+
+    insta::assert_snapshot!(show_no_sig, @r###"
+    Commit ID: 9f2e994e4ee015d1b91f6676bc2de9531efb98fd
+    Change ID: qpvuntsmwlqtpsluzzsnyyzlmlwvmlnu
+    Author: Test User <test.user@example.com> (2001-02-03 04:05:07.000 +07:00)
+    Committer: Test User <test.user@example.com> (2001-02-03 04:05:08.000 +07:00)
+
+        init
+    "###);
+
+    let (_, stderr) = test_env.jj_cmd_ok(&repo_path, &["sign", "-r", "@-"]);
+    insta::assert_snapshot!(stderr, @r###"
+    Rebased 1 descendant commits
+    Working copy now at: rlvkpnrz b162855d (empty) (no description set)
+    Parent commit      : qpvuntsm [✓︎] 5aab9df2 (empty) init
+    Commit was signed: qpvuntsm [✓︎] 5aab9df2 (empty) init
+    "###);
+
+    let show_with_sig = test_env.jj_cmd_success(&repo_path, &["show", "-r", "@-"]);
+
+    insta::assert_snapshot!(show_with_sig, @r###"
+    Commit ID: 5aab9df27eb838f225ae554edd56a11b3ecd13df
+    Change ID: qpvuntsmwlqtpsluzzsnyyzlmlwvmlnu
+    Author: Test User <test.user@example.com> (2001-02-03 04:05:07.000 +07:00)
+    Committer: Test User <test.user@example.com> (2001-02-03 04:05:10.000 +07:00)
+    Signature: Good mock signature
+
+        init
+    "###);
+}
+
+#[test]
+fn test_sig_drop() {
+    let test_env = TestEnvironment::default();
+
+    test_env.add_config(
+        r#"
+[signing]
+show-signatures = true
+sign-all = false
+backend = "test"
+"#,
+    );
+
+    test_env.jj_cmd_ok(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+    test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "init"]);
+
+    let show_no_sig = test_env.jj_cmd_success(&repo_path, &["show", "-r", "@-"]);
+    insta::assert_snapshot!(show_no_sig, @r###"
+    Commit ID: 9f2e994e4ee015d1b91f6676bc2de9531efb98fd
+    Change ID: qpvuntsmwlqtpsluzzsnyyzlmlwvmlnu
+    Author: Test User <test.user@example.com> (2001-02-03 04:05:07.000 +07:00)
+    Committer: Test User <test.user@example.com> (2001-02-03 04:05:08.000 +07:00)
+
+        init
+    "###);
+
+    test_env.jj_cmd_ok(&repo_path, &["sign", "-r", "@-"]);
+
+    let show_with_sig = test_env.jj_cmd_success(&repo_path, &["show", "-r", "@-"]);
+    insta::assert_snapshot!(show_with_sig, @r###"
+    Commit ID: 5aab9df27eb838f225ae554edd56a11b3ecd13df
+    Change ID: qpvuntsmwlqtpsluzzsnyyzlmlwvmlnu
+    Author: Test User <test.user@example.com> (2001-02-03 04:05:07.000 +07:00)
+    Committer: Test User <test.user@example.com> (2001-02-03 04:05:10.000 +07:00)
+    Signature: Good mock signature
+
+        init
+    "###);
+
+    test_env.jj_cmd_ok(&repo_path, &["sign", "-r", "@-", "--drop"]);
+
+    let show_with_sig = test_env.jj_cmd_success(&repo_path, &["show", "-r", "@-"]);
+    insta::assert_snapshot!(show_with_sig, @r###"
+    Commit ID: a37490e69293173538209a45786d10c63c8960d7
+    Change ID: qpvuntsmwlqtpsluzzsnyyzlmlwvmlnu
+    Author: Test User <test.user@example.com> (2001-02-03 04:05:07.000 +07:00)
+    Committer: Test User <test.user@example.com> (2001-02-03 04:05:12.000 +07:00)
+
+        init
+    "###);
+}