[bundler/bundler] Add initial Bundler::BuildMetadata Spec

https://github.com/bundler/bundler/commit/c6458b2727

spec/bundler/bundler/build_metadata_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require "bundler"
+require "bundler/build_metadata"
+
+RSpec.describe Bundler::BuildMetadata do
+  describe "#built_at" do
+    it "returns %Y-%m-%d formatted time" do
+      expect(Bundler::BuildMetadata.built_at).to eq Time.now.strftime("%Y-%m-%d")
+    end
+  end
+
+  describe "#release?" do
+    it "returns false as default" do
+      expect(Bundler::BuildMetadata.release?).to be_falsey
+    end
+  end
+
+  describe "#git_commit_sha" do
+    context "if instance valuable is defined" do
+      before do
+        Bundler::BuildMetadata.instance_variable_set(:@git_commit_sha, "foo")
+      end
+
+      after do
+        Bundler::BuildMetadata.remove_instance_variable(:@git_commit_sha)
+      end
+
+      it "returns set value" do
+        expect(Bundler::BuildMetadata.git_commit_sha).to eq "foo"
+      end
+    end
+  end
+
+  describe "#to_h" do
+    subject { Bundler::BuildMetadata.to_h }
+
+    it "returns a hash includes Built At, Git SHA and Released Version" do
+      expect(subject["Built At"]).to eq Time.now.strftime("%Y-%m-%d")
+      expect(subject["Git SHA"]).to be_instance_of(String)
+      expect(subject["Released Version"]).to be_falsey
+    end
+  end
+end