Add a minimal GraphQL API

5 files changed, 182 insertions, 0 deletions

diff --git a/spec/graphql/gitlab_schema_spec.rb b/spec/graphql/gitlab_schema_spec.rb
new file mode 100644
index 00000000000..3582f297866
--- /dev/null
+++ b/spec/graphql/gitlab_schema_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe GitlabSchema do
+  it 'uses batch loading' do
+    expect(described_class.instrumenters[:multiplex]).to include(GraphQL::Batch::SetupMultiplex)
+  end
+
+  it 'enables the preload instrumenter' do
+    expect(field_instrumenters).to include(instance_of(::GraphQL::Preload::Instrument))
+  end
+
+  it 'enables the authorization instrumenter' do
+    expect(field_instrumenters).to include(instance_of(::Gitlab::Graphql::Authorize))
+  end
+
+  it 'has the base mutation' do
+    expect(described_class.mutation).to eq(::Types::MutationType)
+  end
+
+  it 'has the base query' do
+    expect(described_class.query).to eq(::Types::QueryType)
+  end
+
+  def field_instrumenters
+    described_class.instrumenters[:field]
+  end
+end
diff --git a/spec/graphql/loaders/full_path_loader_spec.rb b/spec/graphql/loaders/full_path_loader_spec.rb
new file mode 100644
index 00000000000..2a473239550
--- /dev/null
+++ b/spec/graphql/loaders/full_path_loader_spec.rb
@@ -0,0 +1,38 @@
+require 'spec_helper'
+
+describe Loaders::FullPathLoader do
+  include GraphqlHelpers
+
+  set(:project1) { create(:project) }
+  set(:project2) { create(:project) }
+
+  set(:other_project) { create(:project) }
+
+  describe '.project' do
+    it 'batch-resolves projects by full path' do
+      paths = [project1.full_path, project2.full_path]
+
+      result = batch(max_queries: 1) do
+        paths.map { |path| resolve_project(path) }
+      end
+
+      expect(result).to contain_exactly(project1, project2)
+    end
+
+    it 'resolves an unknown full_path to nil' do
+      result = batch { resolve_project('unknown/project') }
+
+      expect(result).to be_nil
+    end
+
+    it 'returns a promise' do
+      batch do
+        expect(resolve_project(project1.full_path)).to be_a(Promise)
+      end
+    end
+  end
+
+  def resolve_project(full_path)
+    resolve(described_class, :project, args: { full_path: full_path })
+  end
+end
diff --git a/spec/graphql/loaders/iid_loader_spec.rb b/spec/graphql/loaders/iid_loader_spec.rb
new file mode 100644
index 00000000000..8a0c1f0791a
--- /dev/null
+++ b/spec/graphql/loaders/iid_loader_spec.rb
@@ -0,0 +1,64 @@
+require 'spec_helper'
+
+describe Loaders::IidLoader do
+  include GraphqlHelpers
+
+  set(:project) { create(:project, :repository) }
+  set(:merge_request_1) { create(:merge_request, :simple, source_project: project, target_project: project) }
+  set(:merge_request_2) { create(:merge_request, :rebased, source_project: project, target_project: project) }
+
+  set(:other_project) { create(:project, :repository) }
+  set(:other_merge_request) { create(:merge_request, source_project: other_project, target_project: other_project) }
+
+  let(:full_path) { project.full_path }
+  let(:iid_1) { merge_request_1.iid }
+  let(:iid_2) { merge_request_2.iid }
+
+  let(:other_full_path) { other_project.full_path }
+  let(:other_iid) { other_merge_request.iid }
+
+  describe '.merge_request' do
+    it 'batch-resolves merge requests by target project full path and IID' do
+      path = full_path # avoid database query
+
+      result = batch(max_queries: 2) do
+        [resolve_mr(path, iid_1), resolve_mr(path, iid_2)]
+      end
+
+      expect(result).to contain_exactly(merge_request_1, merge_request_2)
+    end
+
+    it 'can batch-resolve merge requests from different projects' do
+      path = project.full_path # avoid database queries
+      other_path = other_full_path
+
+      result = batch(max_queries: 3) do
+        [resolve_mr(path, iid_1), resolve_mr(path, iid_2), resolve_mr(other_path, other_iid)]
+      end
+
+      expect(result).to contain_exactly(merge_request_1, merge_request_2, other_merge_request)
+    end
+
+    it 'resolves an unknown iid to nil' do
+      result = batch { resolve_mr(full_path, -1) }
+
+      expect(result).to be_nil
+    end
+
+    it 'resolves a known iid for an unknown full_path to nil' do
+      result = batch { resolve_mr('unknown/project', iid_1) }
+
+      expect(result).to be_nil
+    end
+
+    it 'returns a promise' do
+      batch do
+        expect(resolve_mr(full_path, iid_1)).to be_a(Promise)
+      end
+    end
+  end
+
+  def resolve_mr(full_path, iid)
+    resolve(described_class, :merge_request, args: { project: full_path, iid: iid })
+  end
+end
diff --git a/spec/graphql/types/query_type_spec.rb b/spec/graphql/types/query_type_spec.rb
new file mode 100644
index 00000000000..17d9395504c
--- /dev/null
+++ b/spec/graphql/types/query_type_spec.rb
@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+describe GitlabSchema.types['Query'] do
+  it 'is called Query' do
+    expect(described_class.name).to eq('Query')
+  end
+
+  it { is_expected.to have_graphql_fields(:project, :merge_request, :echo) }
+
+  describe 'project field' do
+    subject { described_class.fields['project'] }
+
+    it 'finds projects by full path' do
+      is_expected.to have_graphql_arguments(:full_path)
+      is_expected.to have_graphql_type(Types::ProjectType)
+      is_expected.to have_graphql_resolver(Loaders::FullPathLoader[:project])
+    end
+
+    it 'authorizes with read_project' do
+      is_expected.to require_graphql_authorizations(:read_project)
+    end
+  end
+
+  describe 'merge_request field' do
+    subject { described_class.fields['merge_request'] }
+
+    it 'finds MRs by project and IID' do
+      is_expected.to have_graphql_arguments(:project, :iid)
+      is_expected.to have_graphql_type(Types::MergeRequestType)
+      is_expected.to have_graphql_resolver(Loaders::IidLoader[:merge_request])
+    end
+
+    it 'authorizes with read_merge_request' do
+      is_expected.to require_graphql_authorizations(:read_merge_request)
+    end
+  end
+end
diff --git a/spec/graphql/types/time_type_spec.rb b/spec/graphql/types/time_type_spec.rb
new file mode 100644
index 00000000000..087655cc67d
--- /dev/null
+++ b/spec/graphql/types/time_type_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe GitlabSchema.types['Time'] do
+  let(:float) { 1504630455.96215 }
+  let(:time) { Time.at(float) }
+
+  it { expect(described_class.name).to eq('Time') }
+
+  it 'coerces Time into fractional seconds since epoch' do
+    expect(described_class.coerce_isolated_result(time)).to eq(float)
+  end
+
+  it 'coerces fractional seconds since epoch into Time' do
+    expect(described_class.coerce_isolated_input(float)).to eq(time)
+  end
+end