Fix issues with the jj next and jj prev tests

cli/tests/test_next_prev_commands.rs

@@ -13,6 +13,8 @@
 // limitations under the License.
 //
 
+use std::path::Path;
+
 use crate::common::{get_stderr_string, get_stdout_string, TestEnvironment};
 
 #[test]
@@ -220,6 +222,17 @@ fn test_prev_fails_on_merge_commit() {
     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"]);
+
+    // Check that the graph looks the way we expect.
+    insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
+    @    yqosqzytrlsw
+    ├─╮
+    │ ◉  zsuskulnrvyr right second
+    ◉ │  qpvuntsmwlqt left first
+    ├─╯
+    ◉  zzzzzzzzzzzz
+    "###);
+
     // Try to advance the working copy commit.
     let stderr = test_env.jj_cmd_failure(&repo_path, &["prev"]);
     insta::assert_snapshot!(stderr,@r###"
@@ -240,7 +253,21 @@ fn test_prev_fails_on_multiple_parents() {
     // Create a merge commit, which has two parents.
     test_env.jj_cmd_ok(&repo_path, &["new", "all:@--+"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "merge"]);
-    // Advance the working copy commit.
+
+    // Check that the graph looks the way we expect.
+    insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
+    @  vruxwmqvtpmx
+    ◉      yqosqzytrlsw merge
+    ├─┬─╮
+    │ │ ◉  qpvuntsmwlqt first
+    │ ◉ │  kkmpptxzrspx second
+    │ ├─╯
+    ◉ │  mzvwutvlkqwt third
+    ├─╯
+    ◉  zzzzzzzzzzzz
+    "###);
+
+    // Move @ backwards.
     let (stdout, stderr) = test_env.jj_cmd_stdin_ok(&repo_path, &["prev"], "3\n");
     insta::assert_snapshot!(stdout,@r###"
     ambiguous prev commit, choose one to target:
@@ -251,7 +278,7 @@ fn test_prev_fails_on_multiple_parents() {
     enter the index of the commit you want to target: 
     "###);
     insta::assert_snapshot!(stderr,@r###"
-    Working copy now at: yostqsxw 286a9951 (empty) (no description set)
+    Working copy now at: znkkpsqq 94715f3c (empty) (no description set)
     Parent commit      : qpvuntsm 69542c19 (empty) first
     "###);
 }
@@ -282,18 +309,30 @@ fn test_prev_editing() {
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "second"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "third"]);
     test_env.jj_cmd_ok(&repo_path, &["commit", "-m", "fourth"]);
+    // Edit the "fourth" commit, which becomes the tip when the empty @ commit
+    // is dropped.
+    test_env.jj_cmd_ok(&repo_path, &["edit", "@-"]);
+    // Check that the graph looks the way we expect.
+    insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
+    @  zsuskulnrvyr fourth
+    ◉  kkmpptxzrspx third
+    ◉  rlvkpnrzqnoo second
+    ◉  qpvuntsmwlqt first
+    ◉  zzzzzzzzzzzz
+    "###);
+
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["prev", "--edit"]);
-    insta::assert_snapshot!(stdout, @"");
+    insta::assert_snapshot!(stdout, @r"");
     insta::assert_snapshot!(stderr, @r###"
-    Working copy now at: zsuskuln 009f88bf (empty) fourth
-    Parent commit      : kkmpptxz 3fa8931e (empty) third
+    Working copy now at: kkmpptxz 3fa8931e (empty) third
+    Parent commit      : rlvkpnrz 5c52832c (empty) second
     "###);
     // --edit is implied when already editing a non-head commit
     let (stdout, stderr) = test_env.jj_cmd_ok(&repo_path, &["prev"]);
     insta::assert_snapshot!(stdout, @"");
     insta::assert_snapshot!(stderr, @r###"
-    Working copy now at: yqosqzyt d2edc95b (empty) (no description set)
-    Parent commit      : rlvkpnrz 5c52832c (empty) second
+    Working copy now at: rlvkpnrz 5c52832c (empty) second
+    Parent commit      : qpvuntsm 69542c19 (empty) first
     "###);
 }
 
@@ -322,3 +361,8 @@ fn test_next_editing() {
     Parent commit      : kkmpptxz 3fa8931e (empty) third
     "###);
 }
+
+fn get_log_output(test_env: &TestEnvironment, cwd: &Path) -> String {
+    let template = r#"separate(" ", change_id.short(), local_branches, description)"#;
+    test_env.jj_cmd_success(cwd, &["log", "-T", template])
+}