1 files changed, 102 insertions, 0 deletions
diff --git a/spec/lib/serializers/json_spec.rb b/spec/lib/serializers/json_spec.rb
new file mode 100644
index 00000000000..5d59d66e8b8
--- /dev/null
+++ b/spec/lib/serializers/json_spec.rb
@@ -0,0 +1,102 @@
+require 'fast_spec_helper'
+
+describe Serializers::JSON do
+  describe '.dump' do
+    let(:obj) { { key: "value" } }
+
+    subject { described_class.dump(obj) }
+
+    context 'when MySQL is used' do
+      before do
+        allow(Gitlab::Database).to receive(:adapter_name) { 'mysql2' }
+      end
+
+      it 'encodes as string' do
+        is_expected.to eq('{"key":"value"}')
+      end
+    end
+
+    context 'when PostgreSQL is used' do
+      before do
+        allow(Gitlab::Database).to receive(:adapter_name) { 'postgresql' }
+      end
+
+      it 'returns a hash' do
+        is_expected.to eq(obj)
+      end
+    end
+  end
+
+  describe '.load' do
+    let(:data_string) { '{"key":"value","variables":[{"key":"VAR1","value":"VALUE1"}]}' }
+    let(:data_hash) { JSON.parse(data_string) }
+
+    shared_examples 'having consistent accessor' do
+      it 'allows to access with symbols' do
+        expect(subject[:key]).to eq('value')
+        expect(subject[:variables].first[:key]).to eq('VAR1')
+      end
+
+      it 'allows to access with strings' do
+        expect(subject["key"]).to eq('value')
+        expect(subject["variables"].first["key"]).to eq('VAR1')
+      end
+    end
+
+    context 'when MySQL is used' do
+      before do
+        allow(Gitlab::Database).to receive(:adapter_name) { 'mysql2' }
+      end
+
+      context 'when loading a string' do
+        subject { described_class.load(data_string) }
+
+        it 'decodes a string' do
+          is_expected.to be_a(Hash)
+        end
+
+        it_behaves_like 'having consistent accessor'
+      end
+
+      context 'when loading a different type' do
+        subject { described_class.load({ key: 'hash' }) }
+
+        it 'raises an exception' do
+          expect { subject }.to raise_error(TypeError)
+        end
+      end
+
+      context 'when loading a nil' do
+        subject { described_class.load(nil) }
+
+        it 'returns nil' do
+          is_expected.to be_nil
+        end
+      end
+    end
+
+    context 'when PostgreSQL is used' do
+      before do
+        allow(Gitlab::Database).to receive(:adapter_name) { 'postgresql' }
+      end
+
+      context 'when loading a hash' do
+        subject { described_class.load(data_hash) }
+
+        it 'decodes a string' do
+          is_expected.to be_a(Hash)
+        end
+
+        it_behaves_like 'having consistent accessor'
+      end
+
+      context 'when loading a nil' do
+        subject { described_class.load(nil) }
+
+        it 'returns nil' do
+          is_expected.to be_nil
+        end
+      end
+    end
+  end
+end