radicle-cli/tests: Add `rad_jj_patch`

crates/radicle-cli/examples/jj-config.md

@@ -0,0 +1,19 @@
+Let's make sure that the config is exactly what we expect.
+
+```
+$ jj config list
+ui.editor = "true"
+user.name = "Test User"
+user.email = "test.user@example.com"
+debug.commit-timestamp = "2001-02-03T04:05:06+07:00"
+debug.randomness-seed = 0
+debug.operation-timestamp = "2001-02-03T04:05:06+07:00"
+operation.hostname = "host.example.com"
+operation.username = "test-username"
+```
+
+We enable writing Change ID headers to our commits.
+
+```
+$ jj config set --user git.write-change-id-header true
+```

crates/radicle-cli/examples/jj-init-colocate.md

@@ -0,0 +1,10 @@
+We initialize Jujutusu for our repository by colocating with Git.
+
+```(stderr)
+$ jj git init --colocate
+Done importing changes from the underlying Git repo.
+Hint: The following remote bookmarks aren't associated with the existing local bookmarks:
+  master@rad
+Hint: Run `jj bookmark track master@rad` to keep local bookmarks updated on future pulls.
+Initialized repo in "."
+```

crates/radicle-cli/examples/rad-patch-jj.md

@@ -0,0 +1,91 @@
+The scenario in this file is a variation of the one in `rad-patch.md`,
+but uses Jujutsu.
+
+```
+$ touch REQUIREMENTS
+$ jj describe --message "Define power requirements"
+$ jj status
+Working copy changes:
+A REQUIREMENTS
+Working copy  (@) : lvxkkpmk a6ea7b72 Define power requirements
+Parent commit (@-): xpnzuzwn f2de534b master master@rad | Second commit
+```
+
+```
+$ jj new
+```
+
+Just making sure that Git sees the Change ID…
+
+```
+$ git cat-file commit a6ea7b72
+tree [..]
+parent f2de534b[..]
+author Test User <test.user@example.com> 981147906 +0700
+committer Test User <test.user@example.com> 981147906 +0700
+change-id lvxkkpmk[..]
+
+Define power requirements
+```
+
+As of 2025-05 we can't use `jj` to do push with options directly, see:
+
+ - <https://github.com/jj-vcs/jj/issues/4075>
+ - <https://github.com/jj-vcs/jj/pull/2098>
+
+However, since we initialized Jujutusu to colocate with Git, we can just use
+Git to push.
+
+``` (stderr)
+$ git push rad -o patch.message="Define power requirements" -o patch.message="See details." HEAD:refs/patches
+✓ Patch 1e31055ed3c41a48f2a71ba5317feb863b089700 opened
+To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
+ * [new reference]   HEAD -> refs/patches
+```
+
+It will now be listed as one of the open patches.
+
+```
+$ rad patch
+╭─────────────────────────────────────────────────────────────────────────────────────────╮
+│ ●  ID       Title                      Author         Reviews  Head     +   -   Updated │
+├─────────────────────────────────────────────────────────────────────────────────────────┤
+│ ●  1e31055  Define power requirements  alice   (you)  -        a6ea7b7  +0  -0  now     │
+╰─────────────────────────────────────────────────────────────────────────────────────────╯
+```
+
+Let's also create a bookmark for it.
+
+```
+$ jj bookmark create flux-capacitor-power
+```
+
+```
+$ rad patch show 1e31055 -p
+╭───────────────────────────────────────────────────╮
+│ Title    Define power requirements                │
+│ Patch    1e31055[..                             ] │
+│ Author   alice (you)                              │
+│ Head     a6ea7b7[..                             ] │
+│ Base     f2de534[..                             ] │
+│ Commits  ahead 1, behind 0                        │
+│ Status   open                                     │
+│                                                   │
+│ See details.                                      │
+├───────────────────────────────────────────────────┤
+│ a6ea7b7 Define power requirements                 │
+├───────────────────────────────────────────────────┤
+│ ● Revision 1e31055 @ a6ea7b7 by alice (you) now   │
+╰───────────────────────────────────────────────────╯
+
+commit a6ea7b7[..]
+Author: Test User <test.user@example.com>
+Date:   Sat Feb 3 04:05:06 2001 +0700
+
+    Define power requirements
+
+diff --git a/REQUIREMENTS b/REQUIREMENTS
+new file mode 100644
+index 0000000..e69de29
+
+```

crates/radicle-cli/tests/commands.rs

@@ -858,6 +858,17 @@ fn rad_patch() {
     Environment::alice(["rad-init", "rad-patch"]);
 }
 
+#[test]
+fn rad_jj_colocated_patch() {
+    // We test whether `jj` is installed, and have this test succeed if it is not.
+    // Programmatic skipping of tests is not supported as of 2024-08.
+    if !program_reports_version("jj") {
+        return;
+    }
+
+    Environment::alice(["rad-init", "jj-config", "jj-init-colocate", "rad-patch-jj"])
+}
+
 #[test]
 fn rad_patch_diff() {
     Environment::alice(["rad-init", "rad-patch-diff"]);