test: add health test to catch deprecation warnings on setup()

test/test_health.lua

@@ -0,0 +1,49 @@
+local MiniTest = require("mini.test")
+local T = MiniTest.new_set()
+
+T["no deprecation warnings with complex config"] = function()
+  local issues = {}
+
+  vim.deprecate = function(name)
+    table.insert(issues, "DEPRECATED: " .. name)
+  end
+  vim.health.warn = function(msg)
+    table.insert(issues, "WARNING: " .. msg)
+  end
+  vim.health.error = function(msg)
+    table.insert(issues, "ERROR: " .. msg)
+  end
+
+  require("guttermarks").setup({
+    local_mark = {
+      enabled = true,
+      sign = function(mark)
+        return mark.mark:upper()
+      end,
+      highlight_group = "GutterMarksLocal",
+      priority = 20,
+    },
+    global_mark = {
+      enabled = true,
+      sign = ">>",
+      highlight_group = "GutterMarksGlobal",
+      priority = 21,
+    },
+    special_mark = {
+      enabled = true,
+      marks = { "'", "^", "." },
+      sign = function(mark)
+        return "[" .. mark.mark .. "]"
+      end,
+      highlight_group = "GutterMarksSpecial",
+      priority = 15,
+    },
+    autocmd_triggers = { "BufEnter", "TextChanged" },
+    excluded_filetypes = { "NvimTree", "TelescopePrompt", "" },
+    excluded_buftypes = { "terminal", "prompt", "quickfix", "nofile" },
+  })
+
+  MiniTest.expect.equality(issues, {})
+end
+
+return T