1 files changed, 47 insertions, 0 deletions
diff --git a/spec/ldiff_spec.rb b/spec/ldiff_spec.rb
new file mode 100644
index 0000000..ad1377f
--- /dev/null
+++ b/spec/ldiff_spec.rb
@@ -0,0 +1,47 @@
+# -*- ruby encoding: utf-8 -*-
+
+require 'spec_helper'
+
+describe "Diff::LCS.diff" do
+  include Diff::LCS::SpecHelper::Matchers
+
+  it 'correctly diffs seq1 to seq2' do
+    diff_s1_s2 = Diff::LCS.diff(seq1, seq2)
+    expect(change_diff(correct_forward_diff)).to eq(diff_s1_s2)
+  end
+
+  it 'correctly diffs seq2 to seq1' do
+    diff_s2_s1 = Diff::LCS.diff(seq2, seq1)
+    expect(change_diff(correct_backward_diff)).to eq(diff_s2_s1)
+  end
+
+  it 'correctly diffs against an empty sequence' do
+    diff = Diff::LCS.diff(word_sequence, [])
+    correct_diff = [
+      [ [ '-', 0, 'abcd'           ],
+        [ '-', 1, 'efgh'           ],
+        [ '-', 2, 'ijkl'           ],
+        [ '-', 3, 'mnopqrstuvwxyz' ] ]
+    ]
+
+    expect(change_diff(correct_diff)).to eq(diff)
+
+    diff = Diff::LCS.diff([], word_sequence)
+    correct_diff.each { |hunk| hunk.each { |change| change[0] = '+' } }
+    expect(change_diff(correct_diff)).to eq(diff)
+  end
+
+  it "correctly diffs 'xx' and 'xaxb'" do
+    left = 'xx'
+    right = 'xaxb'
+    expect(Diff::LCS.patch(left, Diff::LCS.diff(left, right))).to eq(right)
+  end
+
+  it "returns an empty diff with (hello, hello)" do
+    expect(Diff::LCS.diff(hello, hello)).to eq([])
+  end
+
+  it "returns an empty diff with (hello_ary, hello_ary)" do
+    expect(Diff::LCS.diff(hello_ary, hello_ary)).to eq([])
+  end
+end