add some specs to InlineSvg::WebpackAssetFinder

inline_svg.gemspec

@@ -24,6 +24,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec_junit_formatter", "0.2.2"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rubocop"
+  spec.add_development_dependency "webmock"
 
   spec.add_runtime_dependency "activesupport", ">= 3.0"
   spec.add_runtime_dependency "nokogiri", ">= 1.6"

lib/inline_svg/webpack_asset_finder.rb

@@ -1,3 +1,7 @@
+require 'tempfile'
+require 'net/http'
+require 'openssl'
+
 module InlineSvg
   class WebpackAssetFinder
     def self.find_asset(filename)
@@ -10,7 +14,7 @@ def initialize(filename)
     end
 
     def pathname
-      return if @asset_path.blank?
+      return unless @asset_path
 
       if Webpacker.dev_server.running?
         dev_server_asset(@asset_path)

spec/webpack_asset_finder_spec.rb

@@ -0,0 +1,78 @@
+require_relative '../lib/inline_svg/webpack_asset_finder'
+require 'webmock'
+
+describe InlineSvg::WebpackAssetFinder do
+  include WebMock::API
+  SVG_STRING = '<svg><!-- Pretty shapes go here --></svg>'.freeze
+
+  before do
+    WebMock.enable!
+
+    Webpacker = double(
+      'Webpacker',
+      manifest: double('Webpacker.manifest'),
+      dev_server: double('Webpacker.dev_server',
+        host: 'webpack.test', port: 3035, https?: dev_server_uses_https, running?: dev_server_running
+      )
+    )
+
+    allow(Webpacker.manifest).to receive(:lookup) { '/packs/media/example.svg' if asset_exists }
+
+    stub_request(
+      :get,
+      "#{dev_server_uses_https ? 'https' : 'http'}://webpack.test:3035/packs/media/example.svg"
+    ).to_return(
+      status: asset_exists ? 200 : 404,
+      body: SVG_STRING
+    )
+
+    Rails = double('Rails', logger: double)
+    allow(Rails.logger).to receive(:error)
+  end
+
+  shared_examples 'valid SVG' do
+    it { expect(subject.pathname.read).to eq SVG_STRING }
+  end
+
+  shared_examples 'invalid SVG' do
+    it { expect(subject.pathname).to be nil }
+  end
+
+  subject { InlineSvg::WebpackAssetFinder.new('media/example.svg') }
+
+  context 'asset exists' do
+    let(:asset_exists) { true }
+
+    context 'dev server is running' do
+      let(:dev_server_running) { true }
+
+      context 'dev server is using HTTPS' do
+        let(:dev_server_uses_https) { true }
+        it_behaves_like 'valid SVG'
+      end
+
+      context 'dev server is using HTTP' do
+        let(:dev_server_uses_https) { false }
+        it_behaves_like 'valid SVG'
+      end
+    end
+  end
+
+  context 'asset does not exist' do
+    let(:asset_exists) { false }
+
+    context 'dev server is running' do
+      let(:dev_server_running) { true }
+
+      context 'dev server is using HTTPS' do
+        let(:dev_server_uses_https) { true }
+        it_behaves_like 'invalid SVG'
+      end
+
+      context 'dev server is using HTTP' do
+        let(:dev_server_uses_https) { false }
+        it_behaves_like 'invalid SVG'
+      end
+    end
+  end
+end