feat: add some tests and improve perf

lua/tests/automated/resolver_spec.lua

@@ -0,0 +1,71 @@
+require('plenary.test_harness'):setup_busted()
+
+local eq = function(a, b)
+  assert.are.same(a, b)
+end
+
+local resolve = require('telescope.config.resolve')
+
+
+describe('telescope.config.resolve', function()
+  describe('win_option', function()
+    it('should resolve for percentages', function()
+      local height_config = 0.8
+      local opt = resolve.win_option(height_config)
+
+      eq(height_config, opt.preview)
+      eq(height_config, opt.prompt)
+      eq(height_config, opt.results)
+    end)
+
+    it('should resolve for percetnages with default', function()
+      local height_config = 0.8
+      local opt = resolve.win_option(nil, height_config)
+
+      eq(height_config, opt.preview)
+      eq(height_config, opt.prompt)
+      eq(height_config, opt.results)
+    end)
+
+    it('should resolve table values', function()
+      local table_val = {'a'}
+      local opt = resolve.win_option(nil, table_val)
+
+      eq(table_val, opt.preview)
+      eq(table_val, opt.prompt)
+      eq(table_val, opt.results)
+    end)
+
+    it('should allow overrides for different wins', function()
+      local prompt_override = {'a', prompt = 'b'}
+      local opt = resolve.win_option(prompt_override)
+      eq('a', opt.preview)
+      eq('a', opt.results)
+      eq('b', opt.prompt)
+    end)
+
+    it('should allow overrides for all wins', function()
+      local all_specified = {preview = 'a', prompt = 'b', results = 'c'}
+      local opt = resolve.win_option(all_specified)
+      eq('a', opt.preview)
+      eq('b', opt.prompt)
+      eq('c', opt.results)
+    end)
+
+    it('should allow some specified with a simple default', function()
+      local some_specified = {prompt = 'b', results = 'c'}
+      local opt = resolve.win_option(some_specified, 'a')
+      eq('a', opt.preview)
+      eq('b', opt.prompt)
+      eq('c', opt.results)
+    end)
+  end)
+
+  describe('resolve_height/width', function()
+    eq(10, resolve.resolve_height(0.1)(nil, 24, 100))
+    eq(2, resolve.resolve_width(0.1)(nil, 24, 100))
+
+    eq(10, resolve.resolve_width(10)(nil, 24, 100))
+    eq(24, resolve.resolve_width(50)(nil, 24, 100))
+  end)
+end)