diff --git a/Library/Homebrew/test/test_exceptions.rb b/Library/Homebrew/test/test_exceptions.rb
new file mode 100644
index 0000000000..e492017363
--- /dev/null
+++ b/Library/Homebrew/test/test_exceptions.rb
@@ -0,0 +1,123 @@
+require "testing_env"
+require "exceptions"
+
+class ExceptionsTest < Homebrew::TestCase
+  def test_multiple_versions_installed_error
+    assert_equal "foo has multiple installed versions",
+      MultipleVersionsInstalledError.new("foo").to_s
+  end
+
+  def test_no_such_keg_error
+    assert_equal "No such keg: #{HOMEBREW_CELLAR}/foo",
+      NoSuchKegError.new("foo").to_s
+  end
+
+  def test_formula_validation_error
+    assert_equal %(invalid attribute for formula 'foo': sha257 ("magic")),
+      FormulaValidationError.new("foo", "sha257", "magic").to_s
+  end
+
+  def test_formula_unavailable_error
+    e = FormulaUnavailableError.new "foo"
+    assert_nil e.dependent_s
+
+    e.dependent = "foo"
+    assert_nil e.dependent_s
+
+    e.dependent = "foobar"
+    assert_equal "(dependency of foobar)", e.dependent_s
+
+    assert_equal "No available formula with the name \"foo\" (dependency of foobar)",
+      e.to_s
+  end
+
+  def test_tap_formula_unavailable_error
+    t = stub({:user => "u", :repo => "r", :to_s => "u/r", :installed? => false})
+    assert_match "Please tap it and then try again: brew tap u/r",
+      TapFormulaUnavailableError.new(t, "foo").to_s
+  end
+
+  def test_tap_unavailable_error
+    assert_equal "No available tap foo.\n", TapUnavailableError.new("foo").to_s
+  end
+
+  def test_tap_already_tapped_error
+    assert_equal "Tap foo already tapped.\n",
+      TapAlreadyTappedError.new("foo").to_s
+  end
+
+  def test_pin_status_error
+    assert_equal "foo is already pinned.",
+      TapPinStatusError.new("foo", true).to_s
+    assert_equal "foo is already unpinned.",
+      TapPinStatusError.new("foo", false).to_s
+  end
+
+  def test_build_error
+    f = stub({:name => "foo"})
+    assert_equal "Failed executing: badprg arg1 arg2",
+      BuildError.new(f, "badprg", %w[arg1 arg2], {}).to_s
+  end
+
+  def test_operation_in_progress_error
+    assert_match "Operation already in progress for bar",
+      OperationInProgressError.new("bar").to_s
+  end
+
+  def test_formula_installation_already_attempted_error
+    f = stub({:full_name => "foo/bar"})
+    assert_equal "Formula installation already attempted: foo/bar",
+      FormulaInstallationAlreadyAttemptedError.new(f).to_s
+  end
+
+  def test_formula_conflict_error
+    f = stub({:full_name => "foo/qux"})
+    c = stub({:name => "bar", :reason => "I decided to"})
+    assert_match "Please `brew unlink bar` before continuing.",
+      FormulaConflictError.new(f, [c]).to_s
+  end
+
+  def test_compiler_selection_error
+    f = stub({:full_name => "foo"})
+    assert_match "foo cannot be built with any available compilers.",
+      CompilerSelectionError.new(f).to_s
+  end
+
+  def test_curl_download_strategy_error
+    assert_equal "File does not exist: /tmp/foo",
+      CurlDownloadStrategyError.new("file:///tmp/foo").to_s
+    assert_equal "Download failed: http://brew.sh",
+      CurlDownloadStrategyError.new("http://brew.sh").to_s
+  end
+
+  def test_error_during_execution
+    assert_equal "Failure while executing: badprg arg1 arg2",
+      ErrorDuringExecution.new("badprg", %w[arg1 arg2]).to_s
+  end
+
+  def test_checksum_mismatch_error
+    h1 = stub({:hash_type => "sha256", :to_s => "deadbeef"})
+    h2 = stub({:hash_type => "sha256", :to_s => "deadcafe"})
+    assert_match "SHA256 mismatch",
+      ChecksumMismatchError.new("/file.tar.gz", h1, h2).to_s
+  end
+
+  def test_resource_missing_error
+    f = stub({:full_name => "bar"})
+    r = stub({:inspect => "<resource foo>"})
+    assert_match "bar does not define resource <resource foo>",
+      ResourceMissingError.new(f, r).to_s
+  end
+
+  def test_duplicate_resource_error
+    r = stub({:inspect => "<resource foo>"})
+    assert_equal "Resource <resource foo> is defined more than once",
+      DuplicateResourceError.new(r).to_s
+  end
+
+  def test_bottle_version_mismatch_error
+    f = stub({:full_name => "foo"})
+    assert_match "Bottle version mismatch",
+      BottleVersionMismatchError.new("/foo.bottle.tar.gz", "1.0", f, "1.1").to_s
+  end
+end