test: add config specs

tests/config_spec.lua

@@ -0,0 +1,55 @@
+local config = require('exercism.config')
+
+describe('exercism.config', function()
+    local default_config = {
+        exercism_workspace = '~/exercism',
+        default_language = 'ruby',
+        add_default_keybindings = true,
+        icons = {
+            concept = '',
+            practice = '',
+        },
+    }
+
+    before_each(function()
+        config.setup(vim.deepcopy(default_config))
+    end)
+
+    it('has default values', function()
+        assert.are.same(config.config.exercism_workspace, '~/exercism')
+        assert.are.same(config.config.default_language, 'ruby')
+        assert.are.same(config.config.add_default_keybindings, true)
+        assert.are.same(config.config.icons.concept, '')
+        assert.are.same(config.config.icons.practice, '')
+    end)
+
+    it('can be overridden', function()
+        local new_config = {
+            exercism_workspace = '~/my_exercism',
+            default_language = 'python',
+            add_default_keybindings = false,
+            icons = {
+                concept = '',
+                practice = '',
+            },
+        }
+        config.setup(new_config)
+        assert.are.same(config.config.exercism_workspace, '~/my_exercism')
+        assert.are.same(config.config.default_language, 'python')
+        assert.are.same(config.config.add_default_keybindings, false)
+        assert.are.same(config.config.icons.concept, '')
+        assert.are.same(config.config.icons.practice, '')
+    end)
+
+    it('merges partial overrides', function()
+        local partial_config = {
+            default_language = 'go',
+        }
+        config.setup(partial_config)
+        assert.are.same(config.config.exercism_workspace, '~/exercism')
+        assert.are.same(config.config.default_language, 'go')
+        assert.are.same(config.config.add_default_keybindings, true)
+        assert.are.same(config.config.icons.concept, '')
+        assert.are.same(config.config.icons.practice, '')
+    end)
+end)