Init Spec

spec/.ruby-version

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+3.2.2

spec/Gemfile

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+source "https://rubygems.org"
+ruby '3.2.2'
+gem 'bosh-template'
+gem 'rspec'
+gem 'json'
+gem 'yaml'

spec/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    bosh-template (2.4.0)
+      semi_semantic (~> 1.2.0)
+    diff-lcs (1.5.0)
+    json (2.6.3)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
+    semi_semantic (1.2.0)
+    yaml (0.2.1)
+
+PLATFORMS
+  x86_64-darwin-22
+
+DEPENDENCIES
+  bosh-template
+  json
+  rspec
+  yaml
+
+RUBY VERSION
+   ruby 3.2.2p53
+
+BUNDLED WITH
+   2.4.10

spec/firehose_exporter_spec.rb

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+require 'rspec'
+require 'json'
+require 'yaml'
+require 'bosh/template/test'
+
+describe 'firehose_exporter job' do
+  let(:release) { Bosh::Template::Test::ReleaseDir.new(File.join(File.dirname(__FILE__), '..')) }
+  let(:job) { release.job('firehose_exporter') }
+
+  describe 'config/bpm.yml template' do
+    let(:template) { job.template('config/bpm.yml') }
+    let(:rendered_template) { template.render(properties) }
+    let(:properties) do
+      {
+        'firehose_exporter' => {
+          'metrics' => {
+            'environment' => 'test'
+          },
+          'logging' => {
+            'url' => 'http://api.yoursystemdomain.here.com'
+          },
+          'retro_compat' => {
+            'disable' => true
+          }
+        }
+      }
+    end
+
+    it 'renders with retro_compat disabled' do
+      expect(rendered_template).to include('FIREHOSE_EXPORTER_RETRO_COMPAT_DISABLE: true')
+    end
+  end
+end

spec/template_example_group.rb

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+# copied from https://github.com/cloudfoundry/bosh/blob/main/spec/template_example_group.rb
+shared_examples_for "a rendered file" do
+  let(:content) { 'file content' }
+  let(:expected_content) { "file content\n" }
+  let(:file_name) do
+    raise 'Override this for file name'
+  end
+
+  let(:properties) do
+    raise 'Override this for binding properties'
+  end
+
+  let(:template) { File.read(File.join(File.dirname(__FILE__), file_name)) }
+
+  subject(:rendered_template) do
+    binding = Bosh::Template::EvaluationContext.new(properties, nil).get_binding
+    ERB.new(template).result(binding)
+  end
+
+  it 'should render the content correctly' do
+    expect(rendered_template).to eq(expected_content)
+  end
+end