Add full option for blob diff action

Returns all diff lines for frontend if full is true.
Turn UnfoldForm into presenter, and move controller logic to presenter.

1 files changed, 84 insertions, 0 deletions

diff --git a/spec/presenters/blobs/unfold_presenter_spec.rb b/spec/presenters/blobs/unfold_presenter_spec.rb
new file mode 100644
index 00000000000..c4d7d457705
--- /dev/null
+++ b/spec/presenters/blobs/unfold_presenter_spec.rb
@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Blobs::UnfoldPresenter do
+  include FakeBlobHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:blob) { fake_blob(path: 'foo', data: "1\n2\n3") }
+  let(:subject) { described_class.new(blob, params) }
+
+  describe '#initialize' do
+    context 'when full is false' do
+      let(:params) { { full: false, since: 2, to: 3, bottom: false, offset: 1, indent: 1 } }
+
+      it 'sets attributes' do
+        result = subject
+
+        expect(result.full?).to eq(false)
+        expect(result.since).to eq(2)
+        expect(result.to).to eq(3)
+        expect(result.bottom).to eq(false)
+        expect(result.offset).to eq(1)
+        expect(result.indent).to eq(1)
+      end
+    end
+
+    context 'when full is true' do
+      let(:params) { { full: true, since: 2, to: 3, bottom: false, offset: 1, indent: 1 } }
+
+      it 'sets other attributes' do
+        result = subject
+
+        expect(result.full?).to eq(true)
+        expect(result.since).to eq(1)
+        expect(result.to).to eq(blob.lines.size)
+        expect(result.bottom).to eq(false)
+        expect(result.offset).to eq(0)
+        expect(result.indent).to eq(0)
+      end
+    end
+  end
+
+  describe '#lines' do
+    context 'when scope is specified' do
+      let(:params) { { since: 2, to: 3 } }
+
+      it 'returns lines cropped by params' do
+        expect(subject.lines.size).to eq(2)
+        expect(subject.lines[0]).to include('LC2')
+        expect(subject.lines[1]).to include('LC3')
+      end
+    end
+
+    context 'when full is true' do
+      let(:params) { { full: true } }
+
+      it 'returns all lines' do
+        expect(subject.lines.size).to eq(3)
+        expect(subject.lines[0]).to include('LC1')
+        expect(subject.lines[1]).to include('LC2')
+        expect(subject.lines[2]).to include('LC3')
+      end
+    end
+  end
+
+  describe '#match_line_text' do
+    context 'when bottom is true' do
+      let(:params) { { since: 2, to: 3, bottom: true } }
+
+      it 'returns empty string' do
+        expect(subject.match_line_text).to eq('')
+      end
+    end
+
+    context 'when bottom is false' do
+      let(:params) { { since: 2, to: 3, bottom: false } }
+
+      it 'returns match line string' do
+        expect(subject.match_line_text).to eq("@@ -2,1+2,1 @@")
+      end
+    end
+  end
+end