add .decompress method to Gzip

lib/datadog/ci/transport/gzip.rb

@@ -16,6 +16,14 @@ def compress(input)
           gzip_writer.close
           sio.string
         end
+
+        def decompress(input)
+          sio = StringIO.new(input)
+          gzip_reader = Zlib::GzipReader.new(sio)
+          gzip_reader.read
+        ensure
+          gzip_reader&.close
+        end
       end
     end
   end

spec/datadog/ci/transport/gzip_spec.rb

@@ -1,11 +1,8 @@
 require_relative "../../../../lib/datadog/ci/transport/gzip"
 
 RSpec.describe Datadog::CI::Transport::Gzip do
-  subject { described_class.compress(input) }
-
-  describe ".compress" do
-    let(:input) do
-      <<-LOREM
+  let(:input) do
+    <<-LOREM
         Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc et est eu dui dignissim tempus. Aliquam
         scelerisque posuere odio id sollicitudin. Etiam dolor lorem, interdum sed mollis consectetur, sagittis a massa.
         Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec gravida, libero ac gravida ornare, leo elit
@@ -18,8 +15,11 @@
         commodo sapien vel, consequat felis. Aenean velit turpis, rhoncus in ipsum ut, tempor iaculis nisi. Fusce
         faucibus consequat blandit. Nam maximus augue quis tellus cursus eleifend. Suspendisse auctor, orci sit amet
         vehicula molestie, magna nibh rutrum metus, eget sagittis felis mauris eu quam. Vivamus ut vulputate est.
-      LOREM
-    end
+    LOREM
+  end
+
+  describe ".compress" do
+    subject { described_class.compress(input) }
 
     it "compresses" do
       expect(input.size).to be > subject.size
@@ -31,4 +31,20 @@
       end
     end
   end
+
+  describe ".decompress" do
+    subject { described_class.decompress(compressed_input) }
+
+    let(:compressed_input) do
+      sio = StringIO.new
+      writer = Zlib::GzipWriter.new(sio)
+      writer << input
+      writer.close
+      sio.string
+    end
+
+    it "decompresses" do
+      expect(subject).to eq(input)
+    end
+  end
 end