brew/Library/Homebrew/test/utils/git_spec.rb

require "utils/git"

describe Git do
  before(:all) do
    git = HOMEBREW_SHIMS_PATH/"scm/git"

    @file = "lib/blah.rb"
    @repo = Pathname.new("repo")

    (@repo/"lib").mkpath
    system git, "init"
    FileUtils.touch(@repo/@file)

    File.open(@repo/@file, "w") { |f| f.write("blah") }
    system git, "add", @repo/@file
    system git, "commit", "-m", "'File added'"
    @h1 = `git rev-parse HEAD`

    File.open(@repo/@file, "w") { |f| f.write("brew") }
    system git, "add", @repo/@file
    system git, "commit", "-m", "'written to File'"
    @h2 = `git rev-parse HEAD`
  end

  let(:hash1) { @h1[0..6] }
  let(:hash2) { @h2[0..6] }

  after(:all) do
    FileUtils.rm_rf(@repo)
  end

  describe "#last_revision_commit_of_file" do
    it "gives last revision commit when before_commit is nil" do
      expect(
        described_class.last_revision_commit_of_file(@repo, @file),
      ).to eq(hash1)
    end

    it "gives revision commit based on before_commit when it is not nil" do
      expect(
        described_class.last_revision_commit_of_file(@repo,
                                                    @file,
                                                    before_commit: hash2),
      ).to eq(hash2)
    end
  end

  describe "#last_revision_of_file" do
    it "returns last revision of file" do
      expect(
        described_class.last_revision_of_file(@repo,
                                              @repo/@file),
      ).to eq("blah")
    end

    it "returns last revision of file based on before_commit" do
      expect(
        described_class.last_revision_of_file(@repo, @repo/@file,
                                              before_commit: "0..3"),
      ).to eq("brew")
    end
  end
end

describe Utils do
  before(:each) do
    if described_class.instance_variable_defined?(:@git)
      described_class.send(:remove_instance_variable, :@git)
    end
  end

  describe "::git_available?" do
    it "returns true if git --version command succeeds" do
      expect(described_class.git_available?).to be_truthy
    end

    it "returns false if git --version command does not succeed" do
      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
      expect(described_class.git_available?).to be_falsey
    end
  end

  describe "::git_path" do
    it "returns nil when git is not available" do
      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
      expect(described_class.git_path).to eq(nil)
    end

    it "returns path of git when git is available" do
      expect(described_class.git_path).to end_with("git")
    end
  end

  describe "::git_version" do
    it "returns nil when git is not available" do
      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
      expect(described_class.git_path).to eq(nil)
    end

    it "returns version of git when git is available" do
      expect(described_class.git_version).not_to be_nil
    end
  end

  describe "::ensure_git_installed!" do
    it "returns nil if git already available" do
      expect(described_class.ensure_git_installed!).to be_nil
    end

    context "when git is not already available" do
      before do
        stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
      end

      it "can't install brewed git if homebrew/core is unavailable" do
        allow_any_instance_of(Pathname).to receive(:directory?).and_return(false)
        expect { described_class.ensure_git_installed! }.to raise_error("Git is unavailable")
      end

      it "raises error if can't install git" do
        stub_const("HOMEBREW_BREW_FILE", mktmpdir/"brew")
        expect { described_class.ensure_git_installed! }.to raise_error("Git is unavailable")
      end

      it "installs git" do
        allow(Homebrew).to receive(:_system).with(any_args).and_return(true)
        described_class.ensure_git_installed!
      end
    end
  end

  describe "::git_remote_exists" do
    it "returns true when git is not available" do
      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
      expect(described_class.git_remote_exists("blah")).to be_truthy
    end

    context "when git is available" do
      it "returns true when git remote exists", :needs_network do
        git = HOMEBREW_SHIMS_PATH/"scm/git"
        repo = Pathname.new("hey")
        repo.mkpath

        system "cd", repo
        system git, "init"
        system git, "remote", "add", "origin", "http://github.com/Homebrew/homebrew.github.io"
        system "cd .."

        expect(described_class.git_remote_exists("http://github.com/Homebrew/homebrew.github.io")).to be_truthy

        FileUtils.rm_rf(repo)
      end

      it "returns false when git remote does not exist" do
        expect(described_class.git_remote_exists("blah")).to be_falsey
      end
    end
  end

  describe "::clear_git_available_cache" do
    it "removes @git_path and @git_version if defined" do
      described_class.clear_git_available_cache

      expect(described_class.instance_variable_get(:@git_path)).to be_nil
      expect(described_class.instance_variable_get(:@git_version)).to be_nil
    end

    it "removes @git if defined" do
      described_class.git_available?
      described_class.clear_git_available_cache

      expect(described_class.instance_variable_get(:@git)).to be_nil
    end
  end
end