Add haveJsonValue matcher

.ruby-gemset

@@ -0,0 +1 @@
+json_spec

.ruby-version

@@ -0,0 +1 @@
+ruby-2.1.4

lib/json_spec/matchers.rb

@@ -2,6 +2,7 @@
 require "json_spec/matchers/include_json"
 require "json_spec/matchers/have_json_path"
 require "json_spec/matchers/have_json_type"
+require "json_spec/matchers/have_json_value"
 require "json_spec/matchers/have_json_size"
 
 module JsonSpec
@@ -22,6 +23,10 @@ def have_json_type(type)
       JsonSpec::Matchers::HaveJsonType.new(type)
     end
 
+    def have_json_value(value)
+      JsonSpec::Matchers::HaveJsonValue.new(value)
+    end
+
     def have_json_size(size)
       JsonSpec::Matchers::HaveJsonSize.new(size)
     end

lib/json_spec/matchers/have_json_value.rb

@@ -0,0 +1,36 @@
+module JsonSpec
+  module Matchers
+    class HaveJsonValue
+      include JsonSpec::Helpers
+      include JsonSpec::Messages
+
+      def initialize(value)
+        @value = value
+      end
+
+      def matches?(json)
+        @ruby = parse_json(json, @path)
+        @value == @ruby
+      end
+
+      def at_path(path)
+        @path = path
+        self
+      end
+
+      def failure_message
+        message_with_path("Expected JSON value to be \"#{@value}\", got \"#{@ruby}\"")
+      end
+      alias :failure_message_for_should :failure_message
+
+      def failure_message_when_negated
+        message_with_path("Expected JSON value to not be \"#{@value}\", got \"#{@ruby}\"")
+      end
+      alias :failure_message_for_should_not :failure_message_when_negated
+
+      def description
+        message_with_path(%(have JSON value "#{@value}"))
+      end
+    end
+  end
+end

spec/json_spec/matchers/have_json_value_spec.rb

@@ -0,0 +1,41 @@
+require "spec_helper"
+
+describe JsonSpec::Matchers::HaveJsonValue do
+  it "matches value at root path" do
+    %("bar").should have_json_value("bar")
+  end
+
+  it "matches value at path" do
+    %({"foo": "bar"}).should have_json_value("bar").at_path("foo")
+  end
+
+  it "matches value at deep path" do
+    %({"foo": {"pipe": "bar"}}).should have_json_value("bar").at_path("foo/pipe")
+  end
+
+  it "provides a failure message" do
+    matcher = have_json_value("pipe")
+    matcher.matches?(%("bar"))
+    matcher.failure_message.should            == "Expected JSON value to be \"pipe\", got \"bar\""
+    matcher.failure_message_for_should.should == "Expected JSON value to be \"pipe\", got \"bar\"" # RSpec 2 interface
+  end
+
+  it "provides a failure message for negation" do
+    matcher = have_json_value("pipe")
+    matcher.matches?(%("bar"))
+    matcher.failure_message_when_negated.should   == "Expected JSON value to not be \"pipe\", got \"bar\""
+    matcher.failure_message_for_should_not.should == "Expected JSON value to not be \"pipe\", got \"bar\"" # RSpec 2 interface
+  end
+
+  it "provides a description message" do
+    matcher = have_json_value("pipe")
+    matcher.matches?(%("pipe"))
+    matcher.description.should == %(have JSON value "pipe")
+  end
+
+  it "provides a description message with path" do
+    matcher = have_json_value("pipe").at_path("json")
+    matcher.matches?(%({"id":1,"json":"pipe"}))
+    matcher.description.should == %(have JSON value "pipe" at path "json")
+  end
+end