Fix rspec deprecation warnings

spec/hooks_utils_spec.rb

@@ -3,20 +3,26 @@ require_relative '../lib/hooks_utils.rb'
 
 describe :get_push_options do
   context "when GIT_PUSH_OPTION_COUNT is not set" do
-    HooksUtils.get_push_options.should == []
+    it { expect(HooksUtils.get_push_options).to eq([]) }
   end
 
   context "when one option is given" do
-    ENV['GIT_PUSH_OPTION_COUNT'] = '1'
-    ENV['GIT_PUSH_OPTION_0'] = 'aaa'
-    HooksUtils.get_push_options.should == ['aaa']
+    before do
+      ENV['GIT_PUSH_OPTION_COUNT'] = '1'
+      ENV['GIT_PUSH_OPTION_0'] = 'aaa'
+    end
+
+    it { expect(HooksUtils.get_push_options).to eq(['aaa']) }
   end
 
   context "when multiple options are given" do
-    ENV['GIT_PUSH_OPTION_COUNT'] = '3'
-    ENV['GIT_PUSH_OPTION_0'] = 'aaa'
-    ENV['GIT_PUSH_OPTION_1'] = 'bbb'
-    ENV['GIT_PUSH_OPTION_2'] = 'ccc'
-    HooksUtils.get_push_options.should == ['aaa', 'bbb', 'ccc']
+    before do
+      ENV['GIT_PUSH_OPTION_COUNT'] = '3'
+      ENV['GIT_PUSH_OPTION_0'] = 'aaa'
+      ENV['GIT_PUSH_OPTION_1'] = 'bbb'
+      ENV['GIT_PUSH_OPTION_2'] = 'ccc'
+    end
+
+    it { expect(HooksUtils.get_push_options).to eq(['aaa', 'bbb', 'ccc']) }
   end
 end