diff --git a/cli/tests/test_diffedit_command.rs b/cli/tests/test_diffedit_command.rs
index 891a3f2ffe..0d69b01286 100644
--- a/cli/tests/test_diffedit_command.rs
+++ b/cli/tests/test_diffedit_command.rs
@@ -352,7 +352,7 @@ fn test_diffedit_merge() {
     test_env.jj_cmd_ok(&repo_path, &["branch", "create", "b"]);
     std::fs::write(repo_path.join("file1"), "b\n").unwrap();
     std::fs::write(repo_path.join("file2"), "b\n").unwrap();
-    test_env.jj_cmd_ok(&repo_path, &["co", "@-"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@-"]);
     test_env.jj_cmd_ok(&repo_path, &["new"]);
     std::fs::write(repo_path.join("file1"), "c\n").unwrap();
     std::fs::write(repo_path.join("file2"), "c\n").unwrap();
diff --git a/cli/tests/test_git_colocated.rs b/cli/tests/test_git_colocated.rs
index 3cc281c6a2..b518ea7495 100644
--- a/cli/tests/test_git_colocated.rs
+++ b/cli/tests/test_git_colocated.rs
@@ -452,7 +452,7 @@ fn test_git_colocated_checkout_non_empty_working_copy() {
     std::fs::write(workspace_root.join("two"), "y").unwrap();
 
     test_env.jj_cmd_ok(&workspace_root, &["describe", "-m", "two"]);
-    test_env.jj_cmd_ok(&workspace_root, &["co", "@-"]);
+    test_env.jj_cmd_ok(&workspace_root, &["new", "@-"]);
     let (_, stderr) = test_env.jj_cmd_ok(&workspace_root, &["describe", "-m", "new"]);
     insta::assert_snapshot!(stderr, @r###"
     Working copy now at: kkmpptxz 4c049607 (empty) new
diff --git a/cli/tests/test_git_push.rs b/cli/tests/test_git_push.rs
index 8fedaf6a44..612b3ce769 100644
--- a/cli/tests/test_git_push.rs
+++ b/cli/tests/test_git_push.rs
@@ -75,7 +75,7 @@ fn test_git_push_current_branch() {
         &workspace_root,
         &["describe", "branch1", "-m", "modified branch1 commit"],
     );
-    test_env.jj_cmd_ok(&workspace_root, &["co", "branch2"]);
+    test_env.jj_cmd_ok(&workspace_root, &["new", "branch2"]);
     test_env.jj_cmd_ok(&workspace_root, &["branch", "set", "branch2"]);
     test_env.jj_cmd_ok(&workspace_root, &["branch", "create", "my-branch"]);
     test_env.jj_cmd_ok(&workspace_root, &["describe", "-m", "foo"]);
@@ -149,7 +149,7 @@ fn test_git_push_no_matching_branch() {
 #[test]
 fn test_git_push_matching_branch_unchanged() {
     let (test_env, workspace_root) = set_up();
-    test_env.jj_cmd_ok(&workspace_root, &["co", "branch1"]);
+    test_env.jj_cmd_ok(&workspace_root, &["new", "branch1"]);
     let (stdout, stderr) = test_env.jj_cmd_ok(&workspace_root, &["git", "push"]);
     insta::assert_snapshot!(stdout, @"");
     insta::assert_snapshot!(stderr, @r###"
diff --git a/cli/tests/test_next_prev_commands.rs b/cli/tests/test_next_prev_commands.rs
index c42c882953..b75a0447aa 100644
--- a/cli/tests/test_next_prev_commands.rs
+++ b/cli/tests/test_next_prev_commands.rs
@@ -121,7 +121,7 @@ fn test_next_fails_on_merge_commit() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "left"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "right"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
     test_env.jj_cmd_ok(&repo_path, &["new", "left", "right"]);
@@ -139,9 +139,9 @@ fn test_next_fails_on_branching_children_no_stdin() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "third"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
 
     // Try to advance the working copy commit.
     let assert = test_env.jj_cmd(&repo_path, &["next"]).assert().code(1);
@@ -158,9 +158,9 @@ fn test_next_fails_on_branching_children_quit_prompt() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "third"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
 
     // Try to advance the working copy commit.
     let assert = test_env
@@ -188,9 +188,9 @@ fn test_next_choose_branching_child() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "third"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     // Advance the working copy commit.
     let (stdout, stderr) = test_env.jj_cmd_stdin_ok(&repo_path, &["next"], "1\n");
     insta::assert_snapshot!(stdout,@r###"
@@ -213,7 +213,7 @@ fn test_prev_fails_on_merge_commit() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "left"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "right"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
     test_env.jj_cmd_ok(&repo_path, &["new", "left", "right"]);
@@ -231,7 +231,7 @@ fn test_prev_fails_on_multiple_parents() {
     let repo_path = test_env.env_root().join("repo");
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "left"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "first"]);
-    test_env.jj_cmd_ok(&repo_path, &["co", "@--"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "@--"]);
     test_env.jj_cmd_ok(&repo_path, &["branch", "c", "right"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
     // Create a merge commit, which has two parents.
diff --git a/cli/tests/test_squash_command.rs b/cli/tests/test_squash_command.rs
index a37b09ed9e..01209db94f 100644
--- a/cli/tests/test_squash_command.rs
+++ b/cli/tests/test_squash_command.rs
@@ -104,7 +104,7 @@ fn test_squash() {
     "###);
 
     // Can squash into a merge commit
-    test_env.jj_cmd_ok(&repo_path, &["co", "e"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "e"]);
     std::fs::write(repo_path.join("file1"), "e\n").unwrap();
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["squash"]);
     insta::assert_snapshot!(stdout, @"");
diff --git a/cli/tests/test_unsquash_command.rs b/cli/tests/test_unsquash_command.rs
index f130c070e1..3026882883 100644
--- a/cli/tests/test_unsquash_command.rs
+++ b/cli/tests/test_unsquash_command.rs
@@ -103,7 +103,7 @@ fn test_unsquash() {
     "###);
 
     // Can unsquash from a merge commit
-    test_env.jj_cmd_ok(&repo_path, &["co", "e"]);
+    test_env.jj_cmd_ok(&repo_path, &["new", "e"]);
     std::fs::write(repo_path.join("file1"), "e\n").unwrap();
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["unsquash"]);
     insta::assert_snapshot!(stdout, @"");