Add test for GitHub::Actions::Annotation.

Library/Homebrew/test/utils/github/actions_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require "utils/github/actions"
+
+describe GitHub::Actions::Annotation do
+  let(:message) { "lorem ipsum" }
+
+  describe "#new" do
+    it "fails when the type is wrong" do
+      expect {
+        described_class.new(:fatal, message)
+      }.to raise_error(ArgumentError)
+    end
+  end
+
+  describe "#to_s" do
+    it "escapes newlines" do
+      annotation = described_class.new(:warning, <<~EOS)
+        lorem
+        ipsum
+      EOS
+
+      expect(annotation.to_s).to eq "::warning::lorem%0Aipsum%0A"
+    end
+
+    it "allows specifying the file" do
+      annotation = described_class.new(:warning, "lorem ipsum", file: "file.txt")
+
+      expect(annotation.to_s).to eq "::warning file=file.txt::lorem ipsum"
+    end
+
+    it "allows specifying the file and line" do
+      annotation = described_class.new(:error, "lorem ipsum", file: "file.txt", line: 3)
+
+      expect(annotation.to_s).to eq "::error file=file.txt,line=3::lorem ipsum"
+    end
+
+    it "allows specifying the file, line and column" do
+      annotation = described_class.new(:error, "lorem ipsum", file: "file.txt", line: 3, column: 18)
+
+      expect(annotation.to_s).to eq "::error file=file.txt,line=3,col=18::lorem ipsum"
+    end
+  end
+end