Convert Fetch test to spec.

Library/Homebrew/cask/spec/cask/cli/fetch_spec.rb

@@ -1,4 +1,4 @@
-require "test_helper"
+require "spec_helper"
 
 describe Hbc::CLI::Fetch do
   let(:local_transmission) {
@@ -13,8 +13,8 @@ describe Hbc::CLI::Fetch do
     shutup do
       Hbc::CLI::Fetch.run("local-transmission", "local-caffeine")
     end
-    Hbc::CurlDownloadStrategy.new(local_transmission).cached_location.must_be :exist?
-    Hbc::CurlDownloadStrategy.new(local_caffeine).cached_location.must_be :exist?
+    expect(Hbc::CurlDownloadStrategy.new(local_transmission).cached_location).to exist
+    expect(Hbc::CurlDownloadStrategy.new(local_caffeine).cached_location).to exist
   end
 
   it "prevents double fetch (without nuking existing installation)" do
@@ -30,7 +30,7 @@ describe Hbc::CLI::Fetch do
     end
     new_ctime = File.stat(download_stategy.cached_location).ctime
 
-    old_ctime.to_i.must_equal new_ctime.to_i
+    expect(old_ctime.to_i).to eq(new_ctime.to_i)
   end
 
   it "allows double fetch with --force" do
@@ -48,31 +48,30 @@ describe Hbc::CLI::Fetch do
     download_stategy = Hbc::CurlDownloadStrategy.new(local_transmission)
     new_ctime = File.stat(download_stategy.cached_location).ctime
 
-    # new_ctime.to_i.must_be :>, old_ctime.to_i
-    new_ctime.to_i.must_be :>, old_ctime.to_i
+    expect(new_ctime.to_i).to be > old_ctime.to_i
   end
 
   it "properly handles Casks that are not present" do
-    lambda {
+    expect {
       shutup do
         Hbc::CLI::Fetch.run("notacask")
       end
-    }.must_raise Hbc::CaskUnavailableError
+    }.to raise_error(Hbc::CaskUnavailableError)
   end
 
   describe "when no Cask is specified" do
     it "raises an exception" do
-      lambda {
+      expect {
         Hbc::CLI::Fetch.run
-      }.must_raise Hbc::CaskUnspecifiedError
+      }.to raise_error(Hbc::CaskUnspecifiedError)
     end
   end
 
   describe "when no Cask is specified, but an invalid option" do
     it "raises an exception" do
-      lambda {
+      expect {
         Hbc::CLI::Fetch.run("--notavalidoption")
-      }.must_raise Hbc::CaskUnspecifiedError
+      }.to raise_error(Hbc::CaskUnspecifiedError)
     end
   end
 end