Convert Pre/PostflightBlock test to spec.

Library/Homebrew/cask/spec/cask/artifact/postflight_block_spec.rb

@@ -1,4 +1,4 @@
-require "test_helper"
+require "spec_helper"
 
 describe Hbc::Artifact::PostflightBlock do
   describe "install_phase" do
@@ -13,10 +13,10 @@ describe Hbc::Artifact::PostflightBlock do
         end
       end
 
-      Hbc::Artifact::PostflightBlock.new(cask).install_phase
+      described_class.new(cask).install_phase
 
-      called.must_equal true
-      yielded_arg.must_be_kind_of Hbc::DSL::Postflight
+      expect(called).to be true
+      expect(yielded_arg).to be_kind_of(Hbc::DSL::Postflight)
     end
   end
 
@@ -32,10 +32,10 @@ describe Hbc::Artifact::PostflightBlock do
         end
       end
 
-      Hbc::Artifact::PostflightBlock.new(cask).uninstall_phase
+      described_class.new(cask).uninstall_phase
 
-      called.must_equal true
-      yielded_arg.must_be_kind_of Hbc::DSL::UninstallPostflight
+      expect(called).to be true
+      expect(yielded_arg).to be_kind_of(Hbc::DSL::UninstallPostflight)
     end
   end
 end

Library/Homebrew/cask/spec/cask/artifact/preflight_block_spec.rb

@@ -1,4 +1,4 @@
-require "test_helper"
+require "spec_helper"
 
 describe Hbc::Artifact::PreflightBlock do
   describe "install_phase" do
@@ -13,10 +13,10 @@ describe Hbc::Artifact::PreflightBlock do
         end
       end
 
-      Hbc::Artifact::PreflightBlock.new(cask).install_phase
+      described_class.new(cask).install_phase
 
-      called.must_equal true
-      yielded_arg.must_be_kind_of Hbc::DSL::Preflight
+      expect(called).to be true
+      expect(yielded_arg).to be_kind_of Hbc::DSL::Preflight
     end
   end
 
@@ -32,10 +32,10 @@ describe Hbc::Artifact::PreflightBlock do
         end
       end
 
-      Hbc::Artifact::PreflightBlock.new(cask).uninstall_phase
+      described_class.new(cask).uninstall_phase
 
-      called.must_equal true
-      yielded_arg.must_be_kind_of Hbc::DSL::UninstallPreflight
+      expect(called).to be true
+      expect(yielded_arg).to be_kind_of Hbc::DSL::UninstallPreflight
     end
   end
 end