Adds a new mechanism to load providers from any gem or file path. (#263)

* Adds ability to load only providers used in config file

spec/unit/pool_manager_spec.rb

@@ -46,6 +46,30 @@ EOT
     end
   end
 
+  describe '#load_used_providers' do
+    let(:config) { YAML.load(<<-EOT
+---
+:config:
+:providers:
+  :mock:
+:pools:
+  - name: '#{pool}'
+    size: 1
+    provider: 'spoof'
+    EOT
+    )
+    }
+    it do
+      files = ["#{project_root_dir}/lib/vmpooler/providers/vsphere.rb",
+               "#{project_root_dir}/lib/vmpooler/providers/dummy.rb"]
+      expect(subject.load_used_providers).to eq(files)
+    end
+  end
+
+  it '#default_providers' do
+    expect(subject.default_providers).to eq(['vsphere', 'dummy'])
+  end
+
   describe '#check_pending_vm' do
     before do
       expect(subject).not_to be_nil

spec/unit/providers/base_spec.rb

@@ -1,4 +1,5 @@
 require 'spec_helper'
+require 'vmpooler/providers/base'
 
 # This spec does not really exercise code paths but is merely used
 # to enforce that certain methods are defined in the base classes

spec/unit/providers/dummy_spec.rb

@@ -1,4 +1,5 @@
 require 'spec_helper'
+require 'vmpooler/providers/dummy'
 
 describe 'Vmpooler::PoolManager::Provider::Dummy' do
   let(:logger) { MockLogger.new }

spec/unit/providers/vsphere_spec.rb

@@ -1,5 +1,6 @@
 require 'spec_helper'
 require 'mock_redis'
+require 'vmpooler/providers/vsphere'
 
 RSpec::Matchers.define :relocation_spec_with_host do |value|
   match { |actual| actual[:spec].host == value }

spec/unit/providers_spec.rb

@@ -0,0 +1,51 @@
+require 'spec_helper'
+require 'vmpooler/providers'
+
+describe 'providers' do
+
+  let(:providers) do
+    Vmpooler::Providers.new
+  end
+
+  it '#correct class' do
+    expect(providers).to be_a Vmpooler::Providers
+  end
+
+  it '#load_all_providers' do
+    p = [
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'base.rb'),
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'dummy.rb'),
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'vsphere.rb')
+    ]
+    expect(Vmpooler::Providers.load_all_providers).to eq(p)
+  end
+
+  it '#installed_providers' do
+    expect(Vmpooler::Providers.installed_providers).to eq(['vmpooler'])
+  end
+
+  it '#vmpooler_provider_gem_list' do
+    expect(providers.vmpooler_provider_gem_list).to be_a Array
+    expect(providers.vmpooler_provider_gem_list.first).to be_a Gem::Specification
+  end
+
+  it '#load_by_name' do
+    expect(Vmpooler::Providers.load_by_name('vsphere')).to eq([File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'vsphere.rb')])
+  end
+
+  it '#load only vpshere' do
+    expect(providers.load_from_gems('vsphere')).to eq([File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'vsphere.rb')])
+  end
+
+  it '#load all providers from gems' do
+    p = [
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'base.rb'),
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'dummy.rb'),
+        File.join(project_root_dir, 'lib', 'vmpooler', 'providers', 'vsphere.rb')
+    ]
+    expect(providers.load_from_gems).to eq(p)
+
+  end
+
+
+end