Squashed - fix encoding issuefix/import-export-encoding

WIP - trying to replicate UTF-8 error

fix spec

fixing encoding issue and another spec, to do with MR diffs

fix issue and spec failure

Add changelog and bumped up I/E version

fix spec based on feedback - omitted target project

3 files changed, 23 insertions, 11 deletions

diff --git a/spec/lib/gitlab/import_export/project.json b/spec/lib/gitlab/import_export/project.json
index 4113d829c3c..b1a5d72c624 100644
--- a/spec/lib/gitlab/import_export/project.json
+++ b/spec/lib/gitlab/import_export/project.json
@@ -2765,7 +2765,7 @@
             "committer_email": "dmitriy.zaporozhets@gmail.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "Binary files a/.DS_Store and /dev/null differ\n",
             "new_path": ".DS_Store",
@@ -3138,7 +3138,7 @@
             "committer_email": "dmitriy.zaporozhets@gmail.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "--- /dev/null\n+++ b/files/ruby/feature.rb\n@@ -0,0 +1,5 @@\n+class Feature\n+  def foo\n+    puts 'bar'\n+  end\n+end\n",
             "new_path": "files/ruby/feature.rb",
@@ -3423,7 +3423,7 @@
             "committer_email": "james@jameslopez.es"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "--- /dev/null\n+++ b/test\n",
             "new_path": "test",
@@ -3960,7 +3960,7 @@
             "committer_email": "dmitriy.zaporozhets@gmail.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "Binary files a/.DS_Store and /dev/null differ\n",
             "new_path": ".DS_Store",
@@ -4597,7 +4597,7 @@
             "committer_email": "marmis85@gmail.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "--- a/CHANGELOG\n+++ b/CHANGELOG\n@@ -1,4 +1,6 @@\n-v 6.7.0\n+v6.8.0\n+\n+v6.7.0\n   - Add support for Gemnasium as a Project Service (Olivier Gonzalez)\n   - Add edit file button to MergeRequest diff\n   - Public groups (Jason Hollingsworth)\n",
             "new_path": "CHANGELOG",
@@ -5108,7 +5108,7 @@
             "committer_email": "stanhu@packetzoom.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "--- a/CHANGELOG\n+++ b/CHANGELOG\n@@ -1,4 +1,6 @@\n-v 6.7.0\n+v6.8.0\n+\n+v6.7.0\n   - Add support for Gemnasium as a Project Service (Olivier Gonzalez)\n   - Add edit file button to MergeRequest diff\n   - Public groups (Jason Hollingsworth)\n",
             "new_path": "CHANGELOG",
@@ -5434,7 +5434,7 @@
         "id": 11,
         "state": "empty",
         "st_commits": null,
-        "st_diffs": [
+        "utf8_st_diffs": [
 
         ],
         "merge_request_id": 11,
@@ -5961,7 +5961,7 @@
             "committer_email": "dmitriy.zaporozhets@gmail.com"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "Binary files a/.DS_Store and /dev/null differ\n",
             "new_path": ".DS_Store",
@@ -6400,7 +6400,7 @@
             "committer_email": "james@jameslopez.es"
           }
         ],
-        "st_diffs": [
+        "utf8_st_diffs": [
           {
             "diff": "--- /dev/null\n+++ b/test\n",
             "new_path": "test",
diff --git a/spec/lib/gitlab/import_export/project_tree_restorer_spec.rb b/spec/lib/gitlab/import_export/project_tree_restorer_spec.rb
index 877be300262..6ae20c943b1 100644
--- a/spec/lib/gitlab/import_export/project_tree_restorer_spec.rb
+++ b/spec/lib/gitlab/import_export/project_tree_restorer_spec.rb
@@ -2,6 +2,7 @@ require 'spec_helper'
 
 describe Gitlab::ImportExport::ProjectTreeRestorer, services: true do
   describe 'restore project tree' do
+
     let(:user) { create(:user) }
     let(:namespace) { create(:namespace, owner: user) }
     let(:shared) { Gitlab::ImportExport::Shared.new(relative_path: "", project_path: 'path') }
@@ -53,6 +54,12 @@ describe Gitlab::ImportExport::ProjectTreeRestorer, services: true do
           expect(event.note.noteable.project).not_to be_nil
         end
       end
+
+      it 'has the correct data for merge request st_diffs' do
+        # makes sure we are renaming the custom method +utf8_st_diffs+ into +st_diffs+
+
+        expect { restored_project_json }.to change(MergeRequestDiff.where.not(st_diffs: nil), :count).by(9)
+      end
     end
   end
 end
diff --git a/spec/lib/gitlab/import_export/project_tree_saver_spec.rb b/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
index 1424de9e60b..057ef6e76a0 100644
--- a/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
+++ b/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
@@ -102,12 +102,17 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
       it 'has ci pipeline notes' do
         expect(saved_project_json['pipelines'].first['notes']).not_to be_empty
       end
+
+      it 'does not complain about non UTF-8 characters in MR diffs' do
+        ActiveRecord::Base.connection.execute("UPDATE merge_request_diffs SET st_diffs = '---\n- :diff: !binary |-\n    LS0tIC9kZXYvbnVsbAorKysgYi9pbWFnZXMvbnVjb3IucGRmCkBAIC0wLDAg\n    KzEsMTY3OSBAQAorJVBERi0xLjUNJeLjz9MNCisxIDAgb2JqDTw8L01ldGFk\n    YXR'")
+
+        expect(project_tree_saver.save).to be true
+      end
     end
   end
 
   def setup_project
     issue = create(:issue, assignee: user)
-    merge_request = create(:merge_request)
     label = create(:label)
     snippet = create(:project_snippet)
     release = create(:release)
@@ -115,12 +120,12 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
     project = create(:project,
                      :public,
                      issues: [issue],
-                     merge_requests: [merge_request],
                      labels: [label],
                      snippets: [snippet],
                      releases: [release]
                     )
 
+    merge_request = create(:merge_request, source_project: project)
     commit_status = create(:commit_status, project: project)
 
     ci_pipeline = create(:ci_pipeline,