Convert Migrator test to spec.

1 files changed, 264 insertions, 0 deletions

diff --git a/Library/Homebrew/test/migrator_spec.rb b/Library/Homebrew/test/migrator_spec.rb
new file mode 100644
index 000000000..90ee9d8ff
--- /dev/null
+++ b/Library/Homebrew/test/migrator_spec.rb
@@ -0,0 +1,264 @@
+require "migrator"
+require "test/support/fixtures/testball"
+require "tab"
+require "keg"
+
+describe Migrator do
+  subject { described_class.new(new_formula) }
+
+  let(:new_formula) { Testball.new("newname") }
+  let(:old_formula) { Testball.new("oldname") }
+
+  let(:new_keg_record) { HOMEBREW_CELLAR/"newname/0.1" }
+  let(:old_keg_record) { HOMEBREW_CELLAR/"oldname/0.1" }
+
+  let(:old_tab) { Tab.empty }
+
+  let(:keg) { Keg.new(old_keg_record) }
+  let(:old_pin) { HOMEBREW_PINNED_KEGS/"oldname" }
+
+  before(:each) do |example|
+    allow(new_formula).to receive(:oldname).and_return("oldname")
+
+    # do not create directories for error tests
+    next if example.metadata[:description].start_with?("raises an error")
+
+    (old_keg_record/"bin").mkpath
+
+    %w[inside bindir].each do |file|
+      FileUtils.touch old_keg_record/"bin/#{file}"
+    end
+
+    old_tab.tabfile = HOMEBREW_CELLAR/"oldname/0.1/INSTALL_RECEIPT.json"
+    old_tab.source["path"] = "/oldname"
+    old_tab.write
+
+    keg.link
+    keg.optlink
+
+    old_pin.make_relative_symlink old_keg_record
+
+    subject # needs to be evaluated eagerly
+
+    (HOMEBREW_PREFIX/"bin").mkpath
+  end
+
+  after(:each) do
+    if !old_keg_record.parent.symlink? && old_keg_record.directory?
+      keg.unlink
+    end
+
+    if new_keg_record.directory?
+      new_keg = Keg.new(new_keg_record)
+      new_keg.unlink
+    end
+  end
+
+  describe "::new" do
+    it "raises an error if there is no old name" do
+      expect {
+        described_class.new(old_formula)
+      }.to raise_error(Migrator::MigratorNoOldnameError)
+    end
+
+    it "raises an error if there is no old path" do
+      expect {
+        described_class.new(new_formula)
+      }.to raise_error(Migrator::MigratorNoOldpathError)
+    end
+
+    it "raises an error if the Taps differ" do
+      keg = HOMEBREW_CELLAR/"oldname/0.1"
+      keg.mkpath
+      tab = Tab.empty
+      tab.tabfile = HOMEBREW_CELLAR/"oldname/0.1/INSTALL_RECEIPT.json"
+      tab.source["tap"] = "homebrew/core"
+      tab.write
+
+      expect {
+        described_class.new(new_formula)
+      }.to raise_error(Migrator::MigratorDifferentTapsError)
+    end
+  end
+
+  specify "#move_to_new_directory" do
+    keg.unlink
+    shutup do
+      subject.move_to_new_directory
+    end
+
+    expect(new_keg_record).to be_a_directory
+    expect(new_keg_record/"bin").to be_a_directory
+    expect(new_keg_record/"bin/inside").to be_a_file
+    expect(new_keg_record/"bin/bindir").to be_a_file
+    expect(old_keg_record).not_to be_a_directory
+  end
+
+  specify "#backup_oldname_cellar" do
+    old_keg_record.parent.rmtree
+    (new_keg_record/"bin").mkpath
+
+    subject.backup_oldname_cellar
+
+    expect(old_keg_record/"bin").to be_a_directory
+    expect(old_keg_record/"bin").to be_a_directory
+  end
+
+  specify "#repin" do
+    (new_keg_record/"bin").mkpath
+    expected_relative = new_keg_record.relative_path_from HOMEBREW_PINNED_KEGS
+
+    subject.repin
+
+    expect(subject.new_pin_record).to be_a_symlink
+    expect(subject.new_pin_record.readlink).to eq(expected_relative)
+    expect(subject.old_pin_record).not_to exist
+  end
+
+  specify "#unlink_oldname" do
+    expect(HOMEBREW_LINKED_KEGS.children.count).to eq(1)
+    expect((HOMEBREW_PREFIX/"opt").children.count).to eq(1)
+
+    shutup do
+      subject.unlink_oldname
+    end
+
+    expect(HOMEBREW_LINKED_KEGS).not_to exist
+    expect(HOMEBREW_LIBRARY/"bin").not_to exist
+  end
+
+  specify "#link_newname" do
+    keg.unlink
+    keg.uninstall
+
+    (new_keg_record/"bin").mkpath
+    %w[inside bindir].each do |file|
+      FileUtils.touch new_keg_record/"bin"/file
+    end
+
+    shutup do
+      subject.link_newname
+    end
+
+    expect(HOMEBREW_LINKED_KEGS.children.count).to eq(1)
+    expect((HOMEBREW_PREFIX/"opt").children.count).to eq(1)
+  end
+
+  specify "#link_oldname_opt" do
+    new_keg_record.mkpath
+    subject.link_oldname_opt
+    expect((HOMEBREW_PREFIX/"opt/oldname").realpath).to eq(new_keg_record.realpath)
+  end
+
+  specify "#link_oldname_cellar" do
+    (new_keg_record/"bin").mkpath
+    keg.unlink
+    keg.uninstall
+    subject.link_oldname_cellar
+    expect((HOMEBREW_CELLAR/"oldname").realpath).to eq(new_keg_record.parent.realpath)
+  end
+
+  specify "#update_tabs" do
+    (new_keg_record/"bin").mkpath
+    tab = Tab.empty
+    tab.tabfile = HOMEBREW_CELLAR/"newname/0.1/INSTALL_RECEIPT.json"
+    tab.source["path"] = "/path/that/must/be/changed/by/update_tabs"
+    tab.write
+    subject.update_tabs
+    expect(Tab.for_keg(new_keg_record).source["path"]).to eq(new_formula.path.to_s)
+  end
+
+  specify "#migrate" do
+    tab = Tab.empty
+    tab.tabfile = HOMEBREW_CELLAR/"oldname/0.1/INSTALL_RECEIPT.json"
+    tab.source["path"] = old_formula.path.to_s
+    tab.write
+
+    shutup do
+      subject.migrate
+    end
+
+    expect(new_keg_record).to exist
+    expect(old_keg_record.parent).to be_a_symlink
+    expect(HOMEBREW_LINKED_KEGS/"oldname").not_to exist
+    expect((HOMEBREW_LINKED_KEGS/"newname").realpath).to eq(new_keg_record.realpath)
+    expect(old_keg_record.realpath).to eq(new_keg_record.realpath)
+    expect((HOMEBREW_PREFIX/"opt/oldname").realpath).to eq(new_keg_record.realpath)
+    expect((HOMEBREW_CELLAR/"oldname").realpath).to eq(new_keg_record.parent.realpath)
+    expect((HOMEBREW_PINNED_KEGS/"newname").realpath).to eq(new_keg_record.realpath)
+    expect(Tab.for_keg(new_keg_record).source["path"]).to eq(new_formula.path.to_s)
+  end
+
+  specify "#unlinik_oldname_opt" do
+    new_keg_record.mkpath
+    old_opt_record = HOMEBREW_PREFIX/"opt/oldname"
+    old_opt_record.unlink if old_opt_record.symlink?
+    old_opt_record.make_relative_symlink(new_keg_record)
+    subject.unlink_oldname_opt
+    expect(old_opt_record).not_to be_a_symlink
+  end
+
+  specify "#unlink_oldname_cellar" do
+    new_keg_record.mkpath
+    keg.unlink
+    keg.uninstall
+    old_keg_record.parent.make_relative_symlink(new_keg_record.parent)
+    subject.unlink_oldname_cellar
+    expect(old_keg_record.parent).not_to be_a_symlink
+  end
+
+  specify "#backup_oldname_cellar" do
+    (new_keg_record/"bin").mkpath
+    keg.unlink
+    keg.uninstall
+    subject.backup_oldname_cellar
+    expect(old_keg_record.subdirs).not_to be_empty
+  end
+
+  specify "#backup_old_tabs" do
+    tab = Tab.empty
+    tab.tabfile = HOMEBREW_CELLAR/"oldname/0.1/INSTALL_RECEIPT.json"
+    tab.source["path"] = "/should/be/the/same"
+    tab.write
+    migrator = Migrator.new(new_formula)
+    tab.tabfile.delete
+    migrator.backup_old_tabs
+    expect(Tab.for_keg(old_keg_record).source["path"]).to eq("/should/be/the/same")
+  end
+
+  describe "#backup_oldname" do
+    after(:each) do
+      expect(old_keg_record.parent).to be_a_directory
+      expect(old_keg_record.parent.subdirs).not_to be_empty
+      expect(HOMEBREW_LINKED_KEGS/"oldname").to exist
+      expect(HOMEBREW_PREFIX/"opt/oldname").to exist
+      expect(HOMEBREW_PINNED_KEGS/"oldname").to be_a_symlink
+      expect(keg).to be_linked
+    end
+
+    context "when cellar exists" do
+      it "backs up the old name" do
+        subject.backup_oldname
+      end
+    end
+
+    context "when cellar is removed" do
+      it "backs up the old name" do
+        (new_keg_record/"bin").mkpath
+        keg.unlink
+        keg.uninstall
+        subject.backup_oldname
+      end
+    end
+
+    context "when cellar is linked" do
+      it "backs up the old name" do
+        (new_keg_record/"bin").mkpath
+        keg.unlink
+        keg.uninstall
+        old_keg_record.parent.make_relative_symlink(new_keg_record.parent)
+        subject.backup_oldname
+      end
+    end
+  end
+end