Ensure Railties available when loading Railtie

In some circumstances when a project has the Rails constant defined we
may still not be able to require the rails/railtie dependency. Before this
change this would raise an exception. This change seeks to add better
detection of the railtie dependency and add logging that this dependency
is missing but still allow execution to continue.

3 files changed, 22 insertions, 0 deletions

diff --git a/spec/integration/rails-without-dependency/.rspec b/spec/integration/rails-without-dependency/.rspec
new file mode 100644
index 0000000..a4c51e7
--- /dev/null
+++ b/spec/integration/rails-without-dependency/.rspec
@@ -0,0 +1,3 @@
+--colour
+--format=documentation
+--pattern=*_spec.rb
diff --git a/spec/integration/rails-without-dependency/Gemfile b/spec/integration/rails-without-dependency/Gemfile
new file mode 100644
index 0000000..85d86fe
--- /dev/null
+++ b/spec/integration/rails-without-dependency/Gemfile
@@ -0,0 +1,4 @@
+source 'http://rubygems.org'
+
+gem 'hashie', path: '../../..'
+gem 'rspec', '~> 3.5.0'
diff --git a/spec/integration/rails-without-dependency/integration_spec.rb b/spec/integration/rails-without-dependency/integration_spec.rb
new file mode 100644
index 0000000..34f8863
--- /dev/null
+++ b/spec/integration/rails-without-dependency/integration_spec.rb
@@ -0,0 +1,15 @@
+require 'rspec/core'
+
+RSpec.describe 'partial-rails' do
+  context 'when Rails constant is present but the railties are not' do
+    before(:all) do
+      class Rails
+        # A class about railways
+      end
+    end
+
+    it 'does not raise an exception when we require hashie' do
+      expect { require 'hashie' }.not_to raise_exception(LoadError)
+    end
+  end
+end