diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index cfb02870410e60fb901f4fca53c96f81595f8a78..9f6861a9ae4ff0612a0dd3a010cf8102e298ea86 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -335,7 +335,7 @@ class Pathname
   alias to_str to_s unless method_defined?(:to_str)
 
   def cd
-    Dir.chdir(self) { yield }
+    Dir.chdir(self) { yield self }
   end
 
   def subdirs
diff --git a/Library/Homebrew/test/cmd/desc_spec.rb b/Library/Homebrew/test/cmd/desc_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..b09819d81c3a3a245ef8370582b79505cf2e05f9
--- /dev/null
+++ b/Library/Homebrew/test/cmd/desc_spec.rb
@@ -0,0 +1,40 @@
+describe "brew desc", :integration_test do
+  let(:desc_cache) { HOMEBREW_CACHE/"desc_cache.json" }
+
+  it "shows a given Formula's description" do
+    setup_test_formula "testball"
+
+    expect { brew "desc", "testball" }
+      .to output("testball: Some test\n").to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+  end
+
+  it "fails when both --search and --name are specified" do
+    expect { brew "desc", "--search", "--name" }
+      .to output(/Pick one, and only one/).to_stderr
+      .and not_to_output.to_stdout
+      .and be_a_failure
+  end
+
+  describe "--search" do
+    it "fails when no search term is given" do
+      expect { brew "desc", "--search" }
+        .to output(/You must provide a search term/).to_stderr
+        .and not_to_output.to_stdout
+        .and be_a_failure
+    end
+  end
+
+  describe "--description" do
+    it "creates a description cache" do
+      expect(desc_cache).not_to exist
+
+      shutup do
+        expect { brew "desc", "--description", "testball" }.to be_a_success
+      end
+
+      expect(desc_cache).to exist
+    end
+  end
+end
diff --git a/Library/Homebrew/test/desc_test.rb b/Library/Homebrew/test/desc_test.rb
deleted file mode 100644
index 2ba498135e506c8166ce2acd303e63f975defaf5..0000000000000000000000000000000000000000
--- a/Library/Homebrew/test/desc_test.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-require "testing_env"
-
-class IntegrationCommandTestDesc < IntegrationCommandTestCase
-  def test_desc
-    setup_test_formula "testball"
-
-    assert_equal "testball: Some test", cmd("desc", "testball")
-    assert_match "Pick one, and only one", cmd_fail("desc", "--search", "--name")
-    assert_match "You must provide a search term", cmd_fail("desc", "--search")
-
-    desc_cache = HOMEBREW_CACHE/"desc_cache.json"
-    refute_predicate desc_cache, :exist?, "Cached file should not exist"
-
-    cmd("desc", "--description", "testball")
-    assert_predicate desc_cache, :exist?, "Cached file should not exist"
-  end
-end
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index e4349c8a00853f79439e4f4bf7815d830cf602ee..3724e425698a2e65e22331a8476cd0d7998050e8 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -37,6 +37,10 @@ RSpec.configure do |config|
       skip "Not on macOS." unless OS.mac?
     end
 
+    if example.metadata[:needs_official_cmd_taps]
+      skip "Needs official command Taps." unless ENV["HOMEBREW_TEST_OFFICIAL_CMD_TAPS"]
+    end
+
     if example.metadata[:needs_python]
       skip "Python not installed." unless which("python")
     end
diff --git a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
index dd2271a3a41cf96e9458c0286a220968b894e7ec..fc7b49fa4de837a1518eafb334f908d1861c8f91 100644
--- a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
+++ b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
@@ -87,6 +87,80 @@ RSpec.shared_context "integration test" do
       status
     end
   end
+
+  def setup_test_formula(name, content = nil)
+    case name
+    when /^testball/
+      content = <<-EOS.undent
+        desc "Some test"
+        homepage "https://example.com/#{name}"
+        url "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1.tbz"
+        sha256 "#{TESTBALL_SHA256}"
+
+        option "with-foo", "Build with foo"
+
+        def install
+          (prefix/"foo"/"test").write("test") if build.with? "foo"
+          prefix.install Dir["*"]
+          (buildpath/"test.c").write \
+            "#include <stdio.h>\\nint main(){return printf(\\"test\\");}"
+          bin.mkpath
+          system ENV.cc, "test.c", "-o", bin/"test"
+        end
+
+        #{content}
+
+        # something here
+      EOS
+    when "foo"
+      content = <<-EOS.undent
+        url "https://example.com/#{name}-1.0"
+      EOS
+    when "bar"
+      content = <<-EOS.undent
+        url "https://example.com/#{name}-1.0"
+        depends_on "foo"
+      EOS
+    end
+
+    Formulary.core_path(name).tap do |formula_path|
+      formula_path.write <<-EOS.undent
+        class #{Formulary.class_s(name)} < Formula
+          #{content}
+        end
+      EOS
+    end
+  end
+
+  def setup_remote_tap(name)
+    Tap.fetch(name).tap do |tap|
+      tap.install(full_clone: false, quiet: true) unless tap.installed?
+    end
+  end
+
+  def install_and_rename_coretap_formula(old_name, new_name)
+    shutup do
+      CoreTap.instance.path.cd do |tap_path|
+        system "git", "init"
+        system "git", "add", "--all"
+        system "git", "commit", "-m",
+          "#{old_name.capitalize} has not yet been renamed"
+
+        brew "install", old_name
+
+        (tap_path/"Formula/#{old_name}.rb").unlink
+        (tap_path/"formula_renames.json").write JSON.generate(old_name => new_name)
+
+        system "git", "add", "--all"
+        system "git", "commit", "-m",
+          "#{old_name.capitalize} has been renamed to #{new_name.capitalize}"
+      end
+    end
+  end
+
+  def testball
+    "#{TEST_FIXTURE_DIR}/testball.rb"
+  end
 end
 
 RSpec.configure do |config|