Point catppuccin theme at its flavour colorscheme

test/shell.d/theme-neovim-colorscheme-test.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+source "$(dirname "${BASH_SOURCE[0]}")/base-test.sh"
+
+# The pinned catppuccin/nvim plugin no longer ships a colorscheme named
+# catppuccin-nvim (its colors/ holds catppuccin{,-latte,-frappe,-macchiato,-mocha}).
+# The base catppuccin theme is the mocha flavour, mirroring how
+# catppuccin-latte uses its flavour-qualified name (#12721).
+if matches=$(grep -rn 'catppuccin-nvim' "$ROOT/themes/"); then
+  fail "stock themes reference no removed catppuccin colorscheme" "$matches"
+fi
+pass "stock themes reference no removed catppuccin colorscheme"
+
+grep -Fq 'colorscheme = "catppuccin-mocha"' "$ROOT/themes/catppuccin/neovim.lua" ||
+  fail "catppuccin theme uses its flavour colorscheme"
+pass "catppuccin theme uses its flavour colorscheme"