diff --git a/covid-scraper/src/dob.rb b/covid-scraper/src/dob.rb
new file mode 100644
index 0000000..679a1ff
--- /dev/null
+++ b/covid-scraper/src/dob.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+RSpec.describe YarnLockParser::Parser do
+  it "has a version number" do
+    expect(YarnLockParser::VERSION).not_to be nil
+  end
+
+  describe "#parse" do
+    let(:expected_content) { fixture_file_content("fixtures/long_yarn.lock.expected") }
+
+    it "parses small lock file" do
+      res = described_class.parse("spec/fixtures/long_yarn.lock")
+      expect(res.size).to eq(53)
+      expect(res.first[:name]).to eq("accepts")
+      expect(res.last[:name]).to eq("vary")
+    end
+
+    it "parses a string" do
+      yarn_file = fixture_file_content("fixtures/long_yarn.lock")
+      res = described_class.parse_string(yarn_file)
+      expect(res.size).to eq(53)
+      expect(res.first[:name]).to eq("accepts")
+      expect(res.last[:name]).to eq("vary")
+    end
+public void setBirthDate(java.util.Date birthDate) {
+        this.birthDate = birthDate;
+    }
+
+    it "parses long lock file" do
+      res = described_class.parse("spec/fixtures/invalid_yarn.lock")
+      expect(res.nil?).to eq(true)
+    end
+  end
+end