add empty tests

test/test_helper.rb

@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+require 'json'
+require 'yaml'
+require 'open3'
+
+require 'jq/extend'
+require 'minitest-implicit-subject'
+require "minitest/reporters"
+require 'minitest/autorun'
+require 'minitest/pride'
+
+class HelmCompileError < StandardError
+end
+
+class HelmDepsError < StandardError
+end
+
+class Chart
+  attr_reader :name, :path, :values
+
+  def initialize(chart)
+    @name = chart.split('/').last
+
+    @path = File.expand_path(chart)
+
+    @values = default_values
+
+    update_deps!
+  end
+
+  def update_deps!
+    command = "helm dep update '#{path}'"
+    stdout, stderr, status = Open3.capture3(command)
+    raise HelmDepsError, stderr if status != 0
+  end
+
+  def reset!
+    @values = default_values
+    @parsed_resources = nil
+  end
+
+  def value(value)
+    values.merge!(value)
+  end
+
+  def configure_custom_name(name)
+    @name = name
+  end
+
+  def execute_helm_template!
+    file = Tempfile.new(name)
+    file.write(JSON.parse(values.to_json).to_yaml)
+    file.close
+
+    begin
+      command = "helm template '#{name}' '#{path}' --namespace='default' --values='#{file.path}'"
+      stdout, stderr, status = Open3.capture3(command)
+
+      raise HelmCompileError, stderr if status != 0
+
+      stdout
+    ensure
+      file.unlink
+    end
+  end
+
+  def parsed_resources
+    @parsed_resources ||= begin
+      output = execute_helm_template!
+      puts output if ENV.fetch('DEBUG', 'false') == 'true'
+      YAML.load_stream(output)
+    end
+  end
+
+  def resources(matcher = nil)
+    return parsed_resources unless matcher
+
+    parsed_resources.select do |r|
+      r >= Hash[matcher.map { |k, v| [k.to_s, v] }]
+    end
+  end
+
+  def default_values
+    {
+    }
+  end
+end
+
+class ExtendedMinitest < Minitest::Test
+  extend MiniTest::Spec::DSL
+end
+
+class ChartTest < ExtendedMinitest
+  Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
+
+  before do
+    chart.reset!
+  end
+
+  def chart
+    self.class.class_variable_get('@@chart')
+  end
+
+  def resource(name)
+    chart.resources(kind: name).first
+  end
+
+  def jq(matcher, object)
+    value(object.jq(matcher)[0])
+  end
+end
+
+class Minitest::Result
+  def name
+    test_name = defined?(@name) ? @name : super
+    test_name.to_s.gsub /\Atest_\d{4,}_/, ""
+  end
+end