Add PostCheckout context specs

Change-Id: I618488922811b331bc256a88d8ace8ab23422e3a
Reviewed-on: http://gerrit.causes.com/35572
Reviewed-by: Shane da Silva <shane@causes.com>
Tested-by: Shane da Silva <shane@causes.com>

Author: sds

spec/overcommit/hook_context/base_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Overcommit::HookContext::Base do
-  let(:config) { double('context') }
+  let(:config) { double('config') }
   let(:args) { [] }
   let(:input) { '' }
   let(:context) { described_class.new(config, args, input) }

spec/overcommit/hook_context/commit_msg_spec.rb

@@ -2,7 +2,7 @@
 require 'overcommit/hook_context/commit_msg'
 
 describe Overcommit::HookContext::CommitMsg do
-  let(:config) { double('context') }
+  let(:config) { double('config') }
   let(:args) { [commit_message_file] }
   let(:input) { '' }
   let(:context) { described_class.new(config, args, input) }

spec/overcommit/hook_context/post_checkout_spec.rb

@@ -0,0 +1,52 @@
+require 'spec_helper'
+require 'overcommit/hook_context/post_checkout'
+
+describe Overcommit::HookContext::PostCheckout do
+  let(:config) { double('config') }
+  let(:args) { [previous_head, new_head, branch_flag] }
+  let(:previous_head) { random_hash }
+  let(:new_head) { random_hash }
+  let(:branch_flag) { '1' }
+  let(:input) { '' }
+  let(:context) { described_class.new(config, args, input) }
+
+  describe '#previous_head' do
+    subject { context.previous_head }
+
+    it { should == previous_head }
+  end
+
+  describe '#new_head' do
+    subject { context.new_head }
+
+    it { should == new_head }
+  end
+
+  describe '#branch_checkout?' do
+    subject { context.branch_checkout? }
+
+    context 'when the flag is 0' do
+      let(:branch_flag) { '0' }
+
+      it { should be_false }
+    end
+
+    context 'when the flag is 1' do
+      it { should be_true }
+    end
+  end
+
+  describe '#file_checkout?' do
+    subject { context.file_checkout? }
+
+    context 'when the flag is 0' do
+      let(:branch_flag) { '0' }
+
+      it { should be_true }
+    end
+
+    context 'when the flag is 1' do
+      it { should be_false }
+    end
+  end
+end

spec/overcommit/hook_context/pre_commit_spec.rb

@@ -2,7 +2,7 @@
 require 'overcommit/hook_context/pre_commit'
 
 describe Overcommit::HookContext::PreCommit do
-  let(:config) { double('context') }
+  let(:config) { double('config') }
   let(:args) { [] }
   let(:input) { '' }
   let(:context) { described_class.new(config, args, input) }

spec/support/git_spec_helpers.rb

@@ -25,4 +25,8 @@ def directory(name = 'some-dir', &block)
 
     File.join(tmpdir, name)
   end
+
+  def random_hash
+    40.times.map { (65 + rand(26)).chr }.join
+  end
 end