Rspec and README

spec/unit/parse_file_spec.rb

@@ -0,0 +1,32 @@
+describe GitHubChangelogGenerator::ParserFile do
+  describe ".github_changelog_generator" do
+    context "when no has file" do
+      let(:options) { {} }
+      let(:parse) { GitHubChangelogGenerator::ParserFile.new(options) }
+      subject { parse.parse! }
+      it { is_expected.to be_nil }
+    end
+
+    context "when file is empty" do
+      let(:options) { { params_file: "spec/files/github_changelog_params_empty" } }
+      let(:parse) { GitHubChangelogGenerator::ParserFile.new(options) }
+      subject { parse.parse! }
+      it { is_expected.to be_a(Hash) }
+      it { is_expected.to eq(options) }
+    end
+
+    context "when file is incorrect" do
+      let(:options) { { params_file: "spec/files/github_changelog_params_incorrect" } }
+      let(:parse) { GitHubChangelogGenerator::ParserFile.new(options) }
+      it { expect { fail.raise! }.to raise_error RuntimeError }
+    end
+
+    context "when override default values" do
+      let(:options) { { params_file: "spec/files/github_changelog_params_override" }.merge(GitHubChangelogGenerator::Parser.get_default_options) }
+      let(:parse) { GitHubChangelogGenerator::ParserFile.new(options) }
+      subject { parse.parse! }
+      it { is_expected.to be_a(Hash) }
+      it { is_expected.to eq(options.merge(unreleased_label: "staging", unreleased: false)) }
+    end
+  end
+end