Change when max_diff_size is applied

- This appears to satisfy the issues found in #60 as well as providing the
  additional fixes required to properly test ldiff.

Resolves #60

5 files changed, 54 insertions, 2 deletions

diff --git a/spec/fixtures/ldiff/output.diff.chef-u b/spec/fixtures/ldiff/output.diff.chef-u
new file mode 100644
index 0000000..9939ecf
--- /dev/null
+++ b/spec/fixtures/ldiff/output.diff.chef-u
@@ -0,0 +1,8 @@
+--- spec/fixtures/old-chef	2020-06-23 21:57:15.000000000 -0400
++++ spec/fixtures/new-chef	2020-06-23 21:57:29.000000000 -0400
+@@ -1,5 +1,5 @@
+ {
+   "name": "x",
+-  "description": "hi"
++  "description": "lo"
+ }
diff --git a/spec/fixtures/new-chef b/spec/fixtures/new-chef
new file mode 100644
index 0000000..d7babfe
--- /dev/null
+++ b/spec/fixtures/new-chef
@@ -0,0 +1,4 @@
+{
+  "name": "x",
+  "description": "lo"
+}
\ No newline at end of file
diff --git a/spec/fixtures/old-chef b/spec/fixtures/old-chef
new file mode 100644
index 0000000..5f9e38b
--- /dev/null
+++ b/spec/fixtures/old-chef
@@ -0,0 +1,4 @@
+{
+  "name": "x",
+  "description": "hi"
+}
\ No newline at end of file
diff --git a/spec/issues_spec.rb b/spec/issues_spec.rb
index c4542bb..c9a1e53 100644
--- a/spec/issues_spec.rb
+++ b/spec/issues_spec.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'spec_helper'
+require 'diff/lcs/hunk'
 
 describe 'Diff::LCS Issues' do
   include Diff::LCS::SpecHelper::Matchers
@@ -64,4 +65,34 @@ describe 'Diff::LCS Issues' do
       }.to raise_error(RSpec::Expectations::ExpectationNotMetError)
     end
   end
+
+  describe "issue #60" do
+    it 'should produce unified output with correct context' do
+      old_data = <<-DATA_OLD.strip.split("\n").map(&:chomp)
+{
+  "name": "x",
+  "description": "hi"
+}
+      DATA_OLD
+
+      new_data = <<-DATA_NEW.strip.split("\n").map(&:chomp)
+{
+  "name": "x",
+  "description": "lo"
+}
+      DATA_NEW
+
+      diff = ::Diff::LCS.diff(old_data, new_data)
+      hunk = ::Diff::LCS::Hunk.new(old_data, new_data, diff.first, 3, 0)
+
+      expect(hunk.diff(:unified)).to eq(<<-EXPECTED.chomp)
+@@ -1,5 +1,5 @@
+ {
+   "name": "x",
+-  "description": "hi"
++  "description": "lo"
+ }
+      EXPECTED
+    end
+  end
 end
diff --git a/spec/ldiff_spec.rb b/spec/ldiff_spec.rb
index bd3c1e9..eee6d86 100644
--- a/spec/ldiff_spec.rb
+++ b/spec/ldiff_spec.rb
@@ -10,6 +10,11 @@ RSpec.describe 'bin/ldiff' do
   let(:output_diff_e) { read_fixture('-e') }
   let(:output_diff_f) { read_fixture('-f') }
   let(:output_diff_u) { read_fixture('-u') }
+  let(:output_diff_chef) { read_fixture('-u', base: 'output.diff.chef')}
+
+  specify do
+    expect(run_ldiff('-u', left: 'old-chef', right: 'new-chef')).to eq(output_diff_chef)
+  end
 
   specify do
     expect(run_ldiff).to eq(output_diff)
@@ -31,8 +36,8 @@ RSpec.describe 'bin/ldiff' do
     expect(run_ldiff('-u')).to eq(output_diff_u)
   end
 
-  def read_fixture(flag = nil)
-    clean_data(IO.binread("spec/fixtures/ldiff/output.diff#{flag}"), flag)
+  def read_fixture(flag = nil, base: 'output.diff')
+    clean_data(IO.binread("spec/fixtures/ldiff/#{base}#{flag}"), flag)
   end
 
   def clean_data(data, flag)