Add the actual value to failure messages for have_json_size and have_json_type matchers

lib/json_spec/matchers.rb

@@ -105,32 +105,36 @@ def scrub(json, path = nil)
   include JsonSpec::Helpers
 
   match do |json|
-    parse_json(json, @path).is_a?(klass)
+    @json = json
+    actual.is_a?(klass)
   end
 
   chain :at_path do |path|
     @path = path
   end
 
   failure_message_for_should do
-    message = "Expected JSON value type to be #{klass}"
+    message = "Expected JSON value type to be #{klass}, got #{actual.class}"
     message << %( at path "#{@path}") if @path
     message
   end
 
   failure_message_for_should_not do
-    message = "Expected JSON value type to not be #{klass}"
+    message = "Expected JSON value type to not be #{klass}, got #{actual.class}"
     message << %( at path "#{@path}") if @path
     message
   end
+
+  def actual
+    parse_json(@json, @path)
+  end
 end
 
 RSpec::Matchers.define :have_json_size do |expected_size|
   include JsonSpec::Helpers
 
   match do |json|
-    ruby = parse_json(json, @path)
-    actual_size = ruby.is_a?(Enumerable) ? ruby.size : 1
+    @json = json
     actual_size == expected_size
   end
 
@@ -139,14 +143,19 @@ def scrub(json, path = nil)
   end
 
   failure_message_for_should do
-    message = "Expected JSON value size to be #{expected_size}"
+    message = "Expected JSON value size to be #{expected_size}, got #{actual_size}"
     message << %( at path "#{@path}") if @path
     message
   end
 
   failure_message_for_should_not do
-    message = "Expected JSON value size to not be #{expected_size}"
+    message = "Expected JSON value size to not be #{expected_size}, got #{actual_size}"
     message << %( at path "#{@path}") if @path
     message
   end
+
+  def actual_size
+    ruby = parse_json(@json, @path)
+    ruby.is_a?(Enumerable) ? ruby.size : 1
+  end
 end

spec/json_spec/matchers_spec.rb

@@ -152,6 +152,18 @@
     it "matches at a path" do
       %({"one":[1,2,3]}).should have_json_size(3).at_path("one")
     end
+
+    it "provides a failure message for should" do
+      matcher = have_json_size(3)
+      matcher.matches?(%([1,2]))
+      matcher.failure_message_for_should.should == "Expected JSON value size to be 3, got 2"
+    end
+
+    it "provides a failure message for should not" do
+      matcher = have_json_size(3)
+      matcher.matches?(%([1,2,3]))
+      matcher.failure_message_for_should_not.should == "Expected JSON value size to not be 3, got 3"
+    end
   end
 
   context "have_json_path" do
@@ -215,6 +227,18 @@
       %(10.0).should have_json_type(Numeric)
     end
 
+    it "provides a failure message for should" do
+      matcher = have_json_type(Numeric)
+      matcher.matches?(%("foo"))
+      matcher.failure_message_for_should.should == "Expected JSON value type to be Numeric, got String"
+    end
+
+    it "provides a failure message for should not" do
+      matcher = have_json_type(Numeric)
+      matcher.matches?(%(10))
+      matcher.failure_message_for_should_not.should == "Expected JSON value type to not be Numeric, got Fixnum"
+    end
+
     context "somewhat uselessly" do
       it "matches true" do
         %(true).should have_json_type(TrueClass)