spec(config): add config spec

tests/config_spec.lua

@@ -0,0 +1,51 @@
+describe('config', function()
+    -- NOTE: keep this test on the top so that it has default cursor
+    -- in other case our property will clear it
+    it('should not overwrite a cursor', function()
+        local current_cursor = table.concat(vim.opt.guicursor:get(), ',')
+
+        local cursor = require 'cursor'
+
+        cursor.setup {
+            overwrite_cursor = false,
+            cursors = {
+                { mode = 'a', shape = 'block' },
+                { mode = 'v', shape = 'ver', size = 25 },
+            },
+        }
+
+        assert.are.equal(current_cursor .. ',a:block,v:ver25', table.concat(vim.opt.guicursor:get(), ','))
+    end)
+
+    it('should overwrite a cursor', function()
+        local cursor = require 'cursor'
+
+        cursor.setup {
+            overwrite_cursor = true,
+            cursors = {
+                { mode = 'a', shape = 'block' },
+                { mode = 'i', shape = 'ver', size = 25 },
+            },
+        }
+
+        assert.are.equal('a:block,i:ver25', table.concat(vim.opt.guicursor:get(), ','))
+    end)
+
+    it('should apply cursors correctly', function()
+        local cursor = require 'cursor'
+
+        cursor.setup {
+            cursors = {
+                { mode = 'i', blink = 300, shape = 'hor', size = 40, hl = 'Cursor' },
+                { mode = 'v', shape = 'block', hl = 'VCursor' },
+                { mode = 'n', shape = 'block', hl = 'NCursor' },
+            },
+            overwrite_cursor = true,
+        }
+
+        assert.are.equal(
+            'i:hor40-Cursor-blinkwait300-blinkon300-blinkoff300,v:block-VCursor,n:block-NCursor',
+            table.concat(vim.opt.guicursor:get(), ',')
+        )
+    end)
+end)