mode: enter/exit debug mode with keybinding lifecycle

tests/test_mode.lua

@@ -0,0 +1,42 @@
+-- tests for debug mode enter/exit
+local td = require("tiny-debugger")
+local mode = require("tiny-debugger.mode")
+
+local function assert_eq(a, b, msg)
+  if a ~= b then
+    error(string.format("FAIL: %s — expected %s, got %s", msg, vim.inspect(b), vim.inspect(a)))
+  end
+end
+
+local function has_buf_map(key)
+  local maps = vim.api.nvim_buf_get_keymap(0, "n")
+  for _, m in ipairs(maps) do
+    if m.lhs == key then return true end
+  end
+  return false
+end
+
+-- test 1: starts inactive
+assert_eq(td.active(), false, "starts inactive")
+
+-- test 2: toggle enters debug mode
+td.toggle()
+assert_eq(td.active(), true, "active after toggle")
+
+-- test 3: keymaps are set
+assert_eq(has_buf_map("c"), true, "continue key mapped")
+assert_eq(has_buf_map("s"), true, "step_over key mapped")
+assert_eq(has_buf_map("d"), true, "step_into key mapped")
+assert_eq(has_buf_map("r"), true, "step_out key mapped")
+assert_eq(has_buf_map("q"), true, "terminate key mapped")
+
+-- test 4: toggle exits debug mode
+td.toggle()
+assert_eq(td.active(), false, "inactive after second toggle")
+
+-- test 5: keymaps are removed
+assert_eq(has_buf_map("c"), false, "continue key removed")
+assert_eq(has_buf_map("s"), false, "step_over key removed")
+assert_eq(has_buf_map("q"), false, "terminate key removed")
+
+print("ALL MODE TESTS PASSED")