Create repo and integration spec for fixed regressions

Author: kpaulisse

spec/octocatalog-diff/fixtures/repos/regressions/README.md

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+# regressions repo fixture
+
+We occasionally encounter edge cases that don't deserve their entire fixture.
+
+We'll add them here.

spec/octocatalog-diff/fixtures/repos/regressions/hiera.yaml

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+---
+:backends:
+  - yaml
+:yaml:
+  :datadir: /var/lib/puppet/environments/%{::environment}/hieradata
+:hierarchy:
+  - common
+:merge_behavior: deeper
+:logger: console

spec/octocatalog-diff/fixtures/repos/regressions/hieradata/common.yaml

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+---
+  classes:
+    - file_no_parameters

spec/octocatalog-diff/fixtures/repos/regressions/manifests/site.pp

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+node default {
+  hiera_include('classes')
+}

spec/octocatalog-diff/fixtures/repos/regressions/modules/file_no_parameters/manifests/init.pp

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+# https://github.com/github/octocatalog-diff/pull/122
+
+class file_no_parameters {
+  file { '/tmp/foo': }
+}

spec/octocatalog-diff/integration/regressions_spec.rb

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+# Miscellaneous regressions
+#
+# - file resource with no parameters
+#   Inspired by https://github.com/github/octocatalog-diff/pull/122
+
+# frozen_string_literal: true
+
+require_relative 'integration_helper'
+
+describe 'miscellaneous regressions' do
+  before(:all) do
+    @result = OctocatalogDiff::Integration.integration(
+      spec_repo: 'regressions',
+      spec_fact_file: 'facts.yaml',
+      argv: [
+        '--hiera-config', 'environments/production/hiera.yaml',
+        '--hiera-path-strip', '/var/lib/puppet'
+      ]
+    )
+  end
+
+  it 'should run without an error' do
+    expect(@result[:exitcode]).not_to eq(-1), "Internal error: #{OctocatalogDiff::Integration.format_exception(@result)}"
+    expect(@result[:exitcode]).to eq(0), "Runtime error: #{@result[:logs]}"
+    expect(@result[:diffs].size).to eq(0), @result[:diffs].map(&:inspect).join("\n")
+  end
+end