From e338a862e12887ba5fec277fbd6e1d1ec89dad6f Mon Sep 17 00:00:00 2001
From: Daniel Perez <daniel@claudetech.com>
Date: Tue, 22 Mar 2016 12:26:02 +0900
Subject: [PATCH] Add NotSupportedError.

---
 lib/hound/exceptions.ex  | 11 +++++++++++
 test/exceptions_test.exs | 17 +++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 test/exceptions_test.exs

diff --git a/lib/hound/exceptions.ex b/lib/hound/exceptions.ex
index 41a7a3a..5853cb0 100644
--- a/lib/hound/exceptions.ex
+++ b/lib/hound/exceptions.ex
@@ -14,3 +14,14 @@ defmodule Hound.InvalidElementError do
     "Could not transform value #{inspect(err.value)} to element"
   end
 end
+
+defmodule Hound.NotSupportedError do
+  defexception [:function, :browser, :driver]
+
+  def message(err) do
+    {:ok, info} = Hound.ConnectionServer.driver_info
+    driver = err.driver || info.driver
+    browser = err.browser || info.browser
+    "#{err.function} is not supported by driver #{driver} with browser #{browser}"
+  end
+end
diff --git a/test/exceptions_test.exs b/test/exceptions_test.exs
new file mode 100644
index 0000000..d47d299
--- /dev/null
+++ b/test/exceptions_test.exs
@@ -0,0 +1,17 @@
+defmodule HoundNotSupportedErrorTest do
+  use ExUnit.Case
+
+  test "message" do
+    {:ok, info} = Hound.ConnectionServer.driver_info
+    function_name = "foo"
+    err = try do
+            raise Hound.NotSupportedError, function: function_name
+          rescue
+            e -> Exception.message(e)
+          end
+    assert err =~ "not supported"
+    assert err =~ function_name
+    assert err =~ info.driver
+    assert err =~ info.browser
+  end
+end