test: change to follow GitLab's testing best practices

Ref. https://docs.gitlab.com/ee/development/testing_guide/best_practices.html

spec/plugin_spec.rb

@@ -20,7 +20,7 @@
       ]
     end
   end
-  describe "#self.define" do
+  describe ".define" do
     it "should load variables via a given block" do
       expect(@plugin.author).to eq("Caleb Anderson")
       expect(@plugin.version).to eq("0.3")

spec/spec_helper.rb

@@ -10,6 +10,8 @@
 require "vcr"
 require "webmock"
 
+require_relative "./support/helpers/helpers"
+
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure
   config.example_status_persistence_file_path = ".rspec_status"
@@ -21,17 +23,7 @@
     c.syntax = :expect
   end
 
-  def capture(stream)
-    begin
-      stream = stream.to_s
-      eval "$#{stream} = StringIO.new"
-      yield
-      result = eval("$#{stream}").string
-    ensure
-      eval("$#{stream} = #{stream.upcase}")
-    end
-    result
-  end
+  config.include Spec::Support::Helpers
 end
 
 VCR.configure do |config|

spec/support/helpers/helpers.rb

@@ -0,0 +1,17 @@
+module Spec
+  module Support
+    module Helpers
+      def capture(stream)
+        begin
+          stream = stream.to_s
+          eval "$#{stream} = StringIO.new"
+          yield
+          result = eval("$#{stream}").string
+        ensure
+          eval("$#{stream} = #{stream.upcase}")
+        end
+        result
+      end
+    end
+  end
+end

spec/whatweb_spec.rb

@@ -6,25 +6,23 @@
   it "has a version number" do
     expect(subject::VERSION).not_to be nil
   end
-  context "without the aggressive mode" do
-    describe "#execute_plugins" do
+  describe ".execute_plugins" do
+    context "without the aggressive mode" do
       it "should return a Hash" do
         results = subject.execute_plugins "https://www.webscantest.com"
         expect(results).to be_a(Hash)
         expect(results.dig("Title").first.dig(:string)).to eq("Test Site")
       end
     end
-  end
-  context "with the aggressive mode" do
-    describe "#execute_plugins" do
+    context "with the aggressive mode" do
       it "should return a Hash" do
         allow_any_instance_of(WhatWeb::Plugin).to receive(:randstr).and_return("fqeewoohxevinxslnplhjbymmeplmkwl")
         results = subject.execute_plugins("https://www.webscantest.com", is_aggressive: true)
         expect(results).to be_a(Hash)
       end
     end
   end
-  describe "#plugin_names" do
+  describe ".plugin_names" do
     it "should return an Array " do
       array = subject.plugin_names
       expect(array).to be_an(Array)