add test for config

lib/gel/config.rb

@@ -2,7 +2,7 @@
 
 class Gel::Config
   def initialize
-    @root = file_path
+    @root = File.expand_path("~/.config/gel")
     @path = File.join(@root, "config")
     @config = nil
   end
@@ -15,8 +15,12 @@ def all
     config
   end
 
-  def file_path
-    File.expand_path("~/.config/gel")
+  def config_exists?
+    File.exist?(@path)
+  end
+
+  def config_file
+    File.read(@path)
   end
 
   def [](group = nil, key)
@@ -41,9 +45,9 @@ def []=(group = nil, key, value)
 
   def read
     result = {}
-    if File.exist?(@path)
+    if config_exists?
       context = nil
-      File.read(@path).each_line do |line|
+      config_file.each_line do |line|
         line.chomp!
         if line =~ /\A(\S[^:]*):\z/
           context = result[$1] = {}

test/config_test.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class ConfigTest < Minitest::Test
+  def test_reading_single_item_from_config_successully
+    config = Class.new(Gel::Config) do
+      define_method(:config_file) do
+        File.open(fixture_file("config")).read
+      end
+
+      define_method(:config_exists?) do
+        true
+      end
+    end
+
+    klass = config.new
+    assert_equal '1', klass['jobs']
+    assert_equal 'true', klass['gem.mit']
+  end
+
+  def test_reading_all_from_config_successully
+    config = Class.new(Gel::Config) do
+      define_method(:config_file) do
+        File.open(fixture_file("config")).read
+      end
+
+      define_method(:config_exists?) do
+        true
+      end
+    end
+
+    output = config.new.all
+    assert output['jobs'] == { '' => '1' }
+    assert output['gem'] == { 'mit' => 'true' }
+  end
+end

test/fixtures/config

@@ -0,0 +1,4 @@
+jobs:
+  : 1
+gem:
+  mit: true