diff --git a/Library/Homebrew/test/utils/tty_spec.rb b/Library/Homebrew/test/utils/tty_spec.rb
new file mode 100644
index 0000000000..3ba89b6fdb
--- /dev/null
+++ b/Library/Homebrew/test/utils/tty_spec.rb
@@ -0,0 +1,67 @@
+require "utils"
+
+describe Tty do
+  describe "::strip_ansi" do
+    it "removes ANSI escape codes from a string" do
+      expect(subject.strip_ansi("\033\[36;7mhello\033\[0m")).to eq("hello")
+    end
+  end
+
+  describe "::width" do
+    it "returns an Integer" do
+      expect(subject.width).to be_kind_of(Integer)
+    end
+
+    it "cannot be negative" do
+      expect(subject.width).to be >= 0
+    end
+  end
+
+  describe "::truncate" do
+    it "truncates the text to the terminal width, minus 4, to account for '==> '" do
+      allow(subject).to receive(:width).and_return(15)
+
+      expect(subject.truncate("foobar something very long")).to eq("foobar some")
+      expect(subject.truncate("truncate")).to eq("truncate")
+    end
+
+    it "doesn't truncate the text if the terminal is unsupported, i.e. the width is 0" do
+      allow(subject).to receive(:width).and_return(0)
+      expect(subject.truncate("foobar something very long")).to eq("foobar something very long")
+    end
+  end
+
+  context "when $stdout is not a TTY" do
+    before(:each) do
+      allow($stdout).to receive(:tty?).and_return(false)
+    end
+
+    it "returns an empty string for all colors" do
+      expect(subject.to_s).to eq("")
+      expect(subject.red.to_s).to eq("")
+      expect(subject.green.to_s).to eq("")
+      expect(subject.yellow.to_s).to eq("")
+      expect(subject.blue.to_s).to eq("")
+      expect(subject.magenta.to_s).to eq("")
+      expect(subject.cyan.to_s).to eq("")
+      expect(subject.default.to_s).to eq("")
+    end
+  end
+
+  context "when $stdout is a TTY" do
+    before(:each) do
+      allow($stdout).to receive(:tty?).and_return(true)
+    end
+
+    it "returns an empty string for all colors" do
+      expect(subject.to_s).to eq("")
+      expect(subject.red.to_s).to eq("\033[31m")
+      expect(subject.green.to_s).to eq("\033[32m")
+      expect(subject.yellow.to_s).to eq("\033[33m")
+      expect(subject.blue.to_s).to eq("\033[34m")
+      expect(subject.magenta.to_s).to eq("\033[35m")
+      expect(subject.cyan.to_s).to eq("\033[36m")
+      expect(subject.default.to_s).to eq("\033[39m")
+    end
+  end
+end
diff --git a/Library/Homebrew/test/utils/tty_test.rb b/Library/Homebrew/test/utils/tty_test.rb
deleted file mode 100644
index 09f092cbdc..0000000000
--- a/Library/Homebrew/test/utils/tty_test.rb
+++ /dev/null
@@ -1,46 +0,0 @@
-require "testing_env"
-require "utils"
-
-class TtyTests < Homebrew::TestCase
-  def test_strip_ansi
-    assert_equal "hello", Tty.strip_ansi("\033\[36;7mhello\033\[0m")
-  end
-
-  def test_width
-    assert_kind_of Integer, Tty.width
-  end
-
-  def test_truncate
-    Tty.stubs(:width).returns 15
-    assert_equal "foobar some", Tty.truncate("foobar something very long")
-    assert_equal "truncate", Tty.truncate("truncate")
-
-    # When the terminal is unsupported, we report 0 width
-    Tty.stubs(:width).returns 0
-    assert_equal "foobar something very long", Tty.truncate("foobar something very long")
-  end
-
-  def test_no_tty_formatting
-    $stdout.stubs(:tty?).returns false
-    assert_equal "", Tty.to_s
-    assert_equal "", Tty.red.to_s
-    assert_equal "", Tty.green.to_s
-    assert_equal "", Tty.yellow.to_s
-    assert_equal "", Tty.blue.to_s
-    assert_equal "", Tty.magenta.to_s
-    assert_equal "", Tty.cyan.to_s
-    assert_equal "", Tty.default.to_s
-  end
-
-  def test_formatting
-    $stdout.stubs(:tty?).returns(true)
-    assert_equal "",         Tty.to_s
-    assert_equal "\033[31m", Tty.red.to_s
-    assert_equal "\033[32m", Tty.green.to_s
-    assert_equal "\033[33m", Tty.yellow.to_s
-    assert_equal "\033[34m", Tty.blue.to_s
-    assert_equal "\033[35m", Tty.magenta.to_s
-    assert_equal "\033[36m", Tty.cyan.to_s
-    assert_equal "\033[39m", Tty.default.to_s
-  end
-end