Add koan on asserting exceptions

diff --git a/koans/about_exceptions.rb b/koans/about_exceptions.rb
index 33b538a..c44833e 100644 (file)
--- a/koans/about_exceptions.rb
+++ b/koans/about_exceptions.rb
@@ -57,4 +57,12 @@ class AboutExceptions < EdgeCase::Koan
     assert_equal __, result
   end
 
+  # Sometimes, we must know about the unknown
+  def test_asserting_an_error_is_raised
+    # A do-end is a block, a topic to explore more later
+    assert_raise(___) do
+      raise MySpecialError.new("New instances can be raised directly.")
+    end
+  end
+
 end

diff --git a/src/about_exceptions.rb b/src/about_exceptions.rb
index e65ed82..2960552 100644 (file)
--- a/src/about_exceptions.rb
+++ b/src/about_exceptions.rb
@@ -57,4 +57,12 @@ class AboutExceptions < EdgeCase::Koan
     assert_equal __(:always_run), result
   end
 
+  # Sometimes, we must know about the unknown
+  def test_asserting_an_error_is_raised
+    # A do-end is a block, a topic to explore more later
+    assert_raise(___(MySpecialError)) do
+      raise MySpecialError.new("New instances can be raised directly.")
+    end
+  end
+
 end