Fix Bitbucket import

In https://gitlab.com/gitlab-org/gitlab-ce/commit/ebf16ada856efb85424a98848c141f21e609886a
we introduced a SHA validator, to ensure that the data provided in
merge request diffs, was legit. Nevertheless, the validator
assumed that the SHA should be 40 chars long.

When we import a project from BitBucket, the retrieved SHA is
shorter (12 chars long). Therefore, this validator prevented to
create a valid MergeRequestDiff for ever MergeRequest (triggering
an exception).

1 files changed, 7 insertions, 2 deletions

diff --git a/spec/validators/sha_validator_spec.rb b/spec/validators/sha_validator_spec.rb
index dc1539cf318..0a76570f65e 100644
--- a/spec/validators/sha_validator_spec.rb
+++ b/spec/validators/sha_validator_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe ShaValidator do
   let(:validator) { described_class.new(attributes: [:base_commit_sha]) }
-  let(:merge_diff) { build(:merge_request_diff) }
+  let!(:merge_diff) { build(:merge_request_diff) }
 
   subject { validator.validate_each(merge_diff, :base_commit_sha, value) }
 
@@ -12,6 +12,8 @@ describe ShaValidator do
     let(:value) { nil }
 
     it 'does not add any error if value is empty' do
+      expect(Commit).not_to receive(:valid_hash?)
+
       subject
 
       expect(merge_diff.errors).to be_empty
@@ -21,7 +23,9 @@ describe ShaValidator do
   context 'with valid sha' do
     let(:value) { Digest::SHA1.hexdigest(SecureRandom.hex) }
 
-    it 'does not add any error if value is empty' do
+    it 'does not add any error' do
+      expect(Commit).to receive(:valid_hash?).and_call_original
+
       subject
 
       expect(merge_diff.errors).to be_empty
@@ -32,6 +36,7 @@ describe ShaValidator do
     let(:value) { 'foo' }
 
     it 'adds error to the record' do
+      expect(Commit).to receive(:valid_hash?).and_call_original
       expect(merge_diff.errors).to be_empty
 
       subject