Create preserve environments fixture and part of integration test

Author: Kevin Paulisse

spec/octocatalog-diff/fixtures/repos/preserve-environments/environments/one/environment.conf

@@ -0,0 +1 @@
+modulepath = ./modules:$basemodulepath

spec/octocatalog-diff/fixtures/repos/preserve-environments/environments/one/modules/bar/manifests/init.pp

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+class bar {
+  file { '/tmp/bar':
+    owner   => 'one',
+    content => $::environment,
+  }
+}

spec/octocatalog-diff/fixtures/repos/preserve-environments/environments/two/environment.conf

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+modulepath = ./modules:$basemodulepath

spec/octocatalog-diff/fixtures/repos/preserve-environments/environments/two/modules/bar/manifests/init.pp

@@ -0,0 +1,6 @@
+class bar {
+  file { '/tmp/bar':
+    owner   => 'two',
+    content => $::environment,
+  }
+}

spec/octocatalog-diff/fixtures/repos/preserve-environments/manifests/site.pp

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+node default {
+  include foo
+  include bar
+}

spec/octocatalog-diff/fixtures/repos/preserve-environments/modules/foo/manifests/init.pp

@@ -0,0 +1,6 @@
+class foo {
+  file { '/tmp/foo':
+    owner   => 'foo',
+    content => $::environment,
+  }
+}

spec/octocatalog-diff/integration/preserve_environments_spec.rb

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+# frozen_string_literal: true
+
+require_relative 'integration_helper'
+
+OctocatalogDiff::Spec.require_path('/catalog')
+
+describe 'preserve environments integration' do
+  context 'without --preserve-environments set' do
+    before(:all) do
+      @result = OctocatalogDiff::Integration.integration(
+        spec_fact_file: 'facts.yaml',
+        spec_repo: 'preserve-environments',
+        argv: [
+          '-n', 'rspec-node.github.net'
+        ]
+      )
+    end
+
+    it 'should exit with error status' do
+      expect(@result.exitcode).to eq(-1), OctocatalogDiff::Integration.format_exception(@result)
+    end
+
+    it 'should raise OctocatalogDiff::CatalogDiff::Cli::Catalogs::CatalogError' do
+      expect(@result.exception).to be_a_kind_of(OctocatalogDiff::CatalogDiff::Cli::Catalogs::CatalogError)
+    end
+
+    it 'should fail because ::bar could not be located' do
+      expect(@result.exception.message).to match(/Could not find class ::bar for rspec-node.github.net/)
+    end
+  end
+
+  context 'with --preserve-environments set' do
+  end
+end