diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..43d9f81
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+TESTS_INIT=tests/init.lua
+TESTS_DIR=tests/
+
+.PHONY: test
+
+test:
+	@nvim \
+		--headless \
+		--noplugin \
+		-u ${TESTS_INIT} \
+		-c "PlenaryBustedDirectory ${TESTS_DIR} { minimal_init = '${TESTS_INIT}' }"
diff --git a/tests/darkbox/darkbox_spec.lua b/tests/darkbox/darkbox_spec.lua
new file mode 100644
index 0000000..725bc50
--- /dev/null
+++ b/tests/darkbox/darkbox_spec.lua
@@ -0,0 +1,161 @@
+require("plenary.reload").reload_module("darkbox", true)
+local darkbox = require("darkbox")
+local default = darkbox.config
+
+local function clear_term_colors()
+  for item = 0, 15 do
+    vim.g["terminal_color_" .. item] = nil
+  end
+end
+
+describe("tests", function()
+  it("works with default values", function()
+    darkbox.setup()
+    assert.are.same(darkbox.config, default)
+  end)
+
+  it("works with config overrides", function()
+    local expected = {
+      terminal_colors = true,
+      undercurl = false,
+      underline = false,
+      bold = true,
+      italic = {
+        strings = true,
+        emphasis = true,
+        comments = true,
+        operators = false,
+        folds = true,
+      },
+      strikethrough = true,
+      inverse = true,
+      invert_selection = false,
+      invert_signs = false,
+      invert_tabline = false,
+      invert_intend_guides = false,
+      contrast = "",
+      palette_overrides = {},
+      overrides = {},
+      dim_inactive = false,
+      transparent_mode = false,
+    }
+
+    darkbox.setup({ undercurl = false, underline = false })
+    assert.are.same(darkbox.config, expected)
+  end)
+
+  it("should override a hightlight color", function()
+    local config = {
+      overrides = {
+        Search = { fg = "#ff9900", bg = "#000000" },
+        ColorColumn = { bg = "#ff9900" },
+      },
+    }
+
+    darkbox.setup(config)
+    darkbox.load()
+
+    local search_group_id = vim.api.nvim_get_hl_id_by_name("Search")
+    local search_values = {
+      background = vim.fn.synIDattr(search_group_id, "bg", "gui"),
+      foreground = vim.fn.synIDattr(search_group_id, "fg", "gui"),
+    }
+
+    assert.are.same(search_values, { background = "#000000", foreground = "#ff9900" })
+
+    local color_column_group_id = vim.api.nvim_get_hl_id_by_name("ColorColumn")
+    local color_column_values = {
+      background = vim.fn.synIDattr(color_column_group_id, "bg", "gui"),
+    }
+
+    assert.are.same(color_column_values, { background = "#ff9900" })
+  end)
+
+  it("should create new hightlights colors if they dont exist", function()
+    local config = {
+      overrides = {
+        Search = { fg = "#ff9900", bg = "#000000" },
+        New = { bg = "#ff9900" },
+      },
+    }
+
+    darkbox.setup(config)
+    darkbox.load()
+
+    local search_group_id = vim.api.nvim_get_hl_id_by_name("Search")
+    local search_values = {
+      background = vim.fn.synIDattr(search_group_id, "bg", "gui"),
+      foreground = vim.fn.synIDattr(search_group_id, "fg", "gui"),
+    }
+
+    assert.are.same(search_values, { background = "#000000", foreground = "#ff9900" })
+
+    local new_group_id = vim.api.nvim_get_hl_id_by_name("New")
+    local new_group_values = {
+      background = vim.fn.synIDattr(new_group_id, "bg", "gui"),
+    }
+
+    assert.are.same(new_group_values, { background = "#ff9900" })
+  end)
+
+  it("should override links", function()
+    local config = {
+      overrides = {
+        TelescopePreviewBorder = { fg = "#990000", bg = nil },
+      },
+    }
+    darkbox.setup(config)
+    darkbox.load()
+
+    local group_id = vim.api.nvim_get_hl_id_by_name("TelescopePreviewBorder")
+    local values = {
+      fg = vim.fn.synIDattr(group_id, "fg", "gui"),
+    }
+
+    local expected = {
+      fg = "#990000",
+    }
+    assert.are.same(expected, values)
+  end)
+
+  it("should override palette", function()
+    local config = {
+      palette_overrides = {
+        gray = "#ff9900",
+      },
+    }
+
+    darkbox.setup(config)
+    darkbox.load()
+
+    local group_id = vim.api.nvim_get_hl_id_by_name("Comment")
+    local values = {
+      fg = vim.fn.synIDattr(group_id, "fg", "gui"),
+    }
+    assert.are.same(values, { fg = "#ff9900" })
+  end)
+
+  it("does not set terminal colors when terminal_colors is false", function()
+    clear_term_colors()
+    darkbox.setup({ terminal_colors = false })
+    darkbox.load()
+    assert.is_nil(vim.g.terminal_color_0)
+  end)
+
+  it("sets terminal colors when terminal_colors is true", function()
+    clear_term_colors()
+    darkbox.setup({ terminal_colors = true })
+    darkbox.load()
+
+    -- dark bg
+    local colors = require("gruvbox").palette
+    vim.opt.background = "dark"
+    assert.are.same(vim.g.terminal_color_0, colors.dark0)
+
+    -- light bg
+    clear_term_colors()
+    darkbox.load()
+    vim.opt.background = "light"
+    assert.are.same(vim.g.terminal_color_0, colors.light0)
+  end)
+end)
diff --git a/tests/init.lua b/tests/init.lua
new file mode 100644
index 0000000..b4c8c23
--- /dev/null
+++ b/tests/init.lua
@@ -0,0 +1,11 @@
+local plenary_dir = os.getenv("PLENARY_DIR") or "/tmp/plenary.nvim"
+local is_not_a_directory = vim.fn.isdirectory(plenary_dir) == 0
+if is_not_a_directory then
+  vim.fn.system({ "git", "clone", "https://github.com/nvim-lua/plenary.nvim", plenary_dir })
+end
+
+vim.opt.rtp:append(".")
+vim.opt.rtp:append(plenary_dir)
+
+vim.cmd("runtime plugin/plenary.vim")
+require("plenary.busted")