ruby : fix bindings (#2484)

* Improve Rakefile

* Remove intermediate files

* Remove unnecessary manipulations from extconf.rb

* Add README and LINCENSE to source files

* Manage ext source files using YAML file

* Use extsources.yaml to include files into gem package file

* Add git-managed source files to build dependency

* Add test task

* Download model for test if not exists

* Add test for build

* Ignore gem package directory

* Enable GitHub action for Ruby binding

* Fix model name

* Build lib file for test

* Use extension for each platform

* Use extension for each platform on testing

* Move built lib file rather than copy

* Add intermediate files to clean targets

bindings/ruby/tests/test_whisper.rb

@@ -1,11 +1,10 @@
 TOPDIR = File.expand_path(File.join(File.dirname(__FILE__), '..'))
-EXTDIR = File.join(TOPDIR, 'ext')
-#$LIBDIR = File.join(TOPDIR, 'lib')
-#$:.unshift(LIBDIR)
-$:.unshift(EXTDIR)
 
 require 'whisper'
 require 'test/unit'
+require 'tempfile'
+require 'tmpdir'
+require 'shellwords'
 
 class TestWhisper < Test::Unit::TestCase
   def setup
@@ -128,4 +127,25 @@ class TestWhisper < Test::Unit::TestCase
     }
   end
 
+  def test_build
+    Tempfile.create do |file|
+      assert system("gem", "build", "whispercpp.gemspec", "--output", file.to_path.shellescape, exception: true)
+      assert_path_exist file.to_path
+    end
+  end
+
+  sub_test_case "Building binary on installation" do
+    def setup
+      system "rake", "build", exception: true
+    end
+
+    def test_install
+      filename = `rake -Tbuild`.match(/(whispercpp-(?:.+)\.gem)/)[1]
+      basename = "whisper.#{RbConfig::CONFIG["DLEXT"]}"
+      Dir.mktmpdir do |dir|
+        system "gem", "install", "--install-dir", dir.shellescape, "pkg/#{filename.shellescape}", exception: true
+        assert_path_exist File.join(dir, "gems/whispercpp-1.3.0/lib", basename)
+      end
+    end
+  end
 end