Add test cases

Author: Timothy Harding

tests/_tide_item_git.test.fish

@@ -70,6 +70,36 @@ _git_item # CHECK: …anch_name
 _git checkout -b 10charhere
 _git_item # CHECK: 10charhere
 
+# --- Hide branch ---
+_git checkout main
+echo >bar
+set -lx tide_git_hide_branch true
+_git_item # CHECK-NOT: main
+_git_item # CHECK: ?1
+
+# Staged files still show with hidden branch
+_git add bar
+_git_item # CHECK: +1
+
+# Mixed signs with hidden branch (verify spacing)
+echo modified >foo
+_git_item # CHECK: +1 !1
+
+# Verify tags still show when branch hiding enabled
+_git commit -m 'Add bar'
+_git tag v1.0
+_git checkout v1.0
+_git_item # CHECK: #v1.0
+
+# Verify SHA still shows in detached HEAD
+_git checkout HEAD~
+_git_item # CHECK: {{@\w*}}
+
+# Toggle back to showing branch
+_git checkout main
+set -lx tide_git_hide_branch false
+_git_item # CHECK: main
+
 # -------- bare repo test --------
 cd $dir/bare-repo
 _git init --bare