diff --git a/lib/xcodebuild/plugin.rb b/lib/xcodebuild/plugin.rb
index 1a36487..fac7ae2 100644
--- a/lib/xcodebuild/plugin.rb
+++ b/lib/xcodebuild/plugin.rb
@@ -14,35 +14,77 @@ module Danger
   #
   class DangerXcodebuild < Plugin
 
-    # Allows you to specify an xcodebuild JSON file location to parse.
-    attr_accessor :xcodebuild_json
-
     def initialize(arg)
       super
       @warning_count = 0
       @error_count = 0
       @test_failures_count = 0
+      @xcodebuild_json = nil
+    end
+
+    # Allows you to specify an xcodebuild JSON file location to parse.
+    attr_reader :json_file
+
+    # Allows you to specify an xcodebuild JSON file location to parse.
+    # @return   [void]
+    #
+    def json_file=(value)
+      @json_file = value
+      @xcodebuild_json = JSON.parse(File.open(value, 'r').read)
     end
 
     # Parses and exposes eventual warnings.
     # @return   [warning_count]
     #
     def parse_warnings
-
+      @warning_count = @xcodebuild_json["warnings"].count
+      @warning_count = @warning_count + @xcodebuild_json["ld_warnings"].count
+      @warning_count = @warning_count + @xcodebuild_json["compile_warnings"].count
+      if @warning_count > 0
+        warning_string = @warning_count == 1 ? "warning" : "warnings"
+        warn("Please fix **#{@warning_count}** #{warning_string} 😒")
+      end
+      return @warning_count
     end
 
     # Parses and expose eventual errors.
     # @return   [error_count]
     #
     def parse_errors
-
+      errors = @xcodebuild_json["errors"].map {|x| "`#{x}`"}
+      errors += @xcodebuild_json["compile_errors"].map {|x| "`[#{x["file_path"].split("/").last}] #{x["reason"]}`"}
+      errors += @xcodebuild_json["file_missing_errors"].map {|x| "`[#{x["file_path"].split("/").last}] #{x["reason"]}`"}
+      errors += @xcodebuild_json["undefined_symbols_errors"].map {|x| "`#{x["message"]}`"}
+      errors += @xcodebuild_json["duplicate_symbols_errors"].map {|x| "`#{x["message"]}`"}
+      if errors.count > 0
+        error_string = errors.count == 1 ? "error" : "errors"
+        fail("Build failed with **#{errors.count}** #{error_string} 🚨")
+        errors.each do |error|
+          fail(error)
+        end
+      end
+      @error_count = errors.count
+      return @error_count
     end
 
     # Parses and exposes eventual test failures.
     # @return   [test_failures]
     #
     def parse_tests
+      test_failures = Array.new
+      @xcodebuild_json["tests_failures"].each do |key, value|
+        test_failures += value.map {|x| "`[#{x["file_path"].split("/").last}] [#{x["test_case"]}] #{x["reason"]}`"}
+      end
 
+      if test_failures.count > 0
+        test_string = test_failures.count == 1 ? "error" : "errors"
+        fail("Test execution failed with **#{test_failures.count}** #{test_string} 🚨")
+        test_failures.each do |test_failure|
+          fail(test_failure)
+        end
+      end
+      @test_failures_count = test_failures.count
+      return @test_failures_count
     end
 
     # Prints "Perfect build 👍🏻" if everything is ok after parsing.
diff --git a/spec/xcodebuild_spec.rb b/spec/xcodebuild_spec.rb
index ebdd145..7030e84 100644
--- a/spec/xcodebuild_spec.rb
+++ b/spec/xcodebuild_spec.rb
@@ -17,7 +17,99 @@ module Danger
 
       it "is a perfect build" do
         expect(@xcodebuild.perfect_build).to be true
-        expect(@dangerfile.status_report[:messages]).to eq(["Perfect build 👍🏻"])
+        expect(@dangerfile.status_report[:messages].first).to eq("Perfect build 👍🏻")
+        expect(@dangerfile.status_report[:errors]).to be_empty
+        expect(@dangerfile.status_report[:warnings]).to be_empty
+        expect(@dangerfile.status_report[:markdowns]).to be_empty
+      end
+
+      describe 'with warnings' do
+
+        before do
+          data = {
+            :warnings => ['warning1', 'warning2'],
+            :ld_warnings => ['ld_warnings'],
+            :compile_warnings => ['compile_warnings']
+          }.to_json
+
+          filename = 'xcodebuild_warnings.json'
+          allow(File).to receive(:open).with(filename, 'r').and_return(StringIO.new(data))
+
+          @xcodebuild.json_file = filename
+        end
+
+        it "has to report warnings" do
+          expect(@xcodebuild.parse_warnings).to eq(4)
+          expect(@xcodebuild.perfect_build).to be false
+          expect(@dangerfile.status_report[:warnings].first).to eq("Please fix **4** warnings 😒")
+          expect(@dangerfile.status_report[:errors]).to be_empty
+          expect(@dangerfile.status_report[:messages]).to be_empty
+          expect(@dangerfile.status_report[:markdowns]).to be_empty
+        end
+
+      end
+
+      describe 'with errors' do
+
+        before do
+          data = {
+            :errors => ['error1', 'error2'],
+            :compile_errors => [
+              { :file_path => '/tmp/file1.m', :reason => 'reason1' },
+              { :file_path => '/tmp/file2.m', :reason => 'reason2' }
+            ],
+            :file_missing_errors => [
+              { :file_path => '/tmp/missing_file1.m', :reason => 'reason1' },
+              { :file_path => '/tmp/missing_file2.m', :reason => 'reason2' }
+            ],
+            :undefined_symbols_errors => [{ :message => 'undefined_symbols' }],
+            :duplicate_symbols_errors => [{ :message => 'duplicate_symbols' }]
+          }.to_json
+
+          filename = 'xcodebuild_errors.json'
+          allow(File).to receive(:open).with(filename, 'r').and_return(StringIO.new(data))
+
+          @xcodebuild.json_file = filename
+        end
+
+        it "has to report errors" do
+          expect(@xcodebuild.parse_errors).to eq(8)
+          expect(@xcodebuild.perfect_build).to be false
+          expect(@dangerfile.status_report[:errors].count).to eq(8+1)
+          expect(@dangerfile.status_report[:errors].first).to eq("Build failed with **8** errors 🚨")
+          expect(@dangerfile.status_report[:warnings]).to be_empty
+          expect(@dangerfile.status_report[:messages]).to be_empty
+          expect(@dangerfile.status_report[:markdowns]).to be_empty
+        end
+
+      end
+
+      describe 'with tests failures' do
+
+        before do
+          data = {
+            :tests_failures => {
+              :suite1 => [{ :file_path => '/tmp/file1.m', :test_case => "testCase1", :reason => 'reason1' }],
+              :suite2 => [{ :file_path => '/tmp/file2.m', :test_case => "testCase2", :reason => 'reason2' }]
+            }
+          }.to_json
+
+          filename = 'xcodebuild_tests.json'
+          allow(File).to receive(:open).with(filename, 'r').and_return(StringIO.new(data))
+
+          @xcodebuild.json_file = filename
+        end
+
+        it "has to report tests failures" do
+          expect(@xcodebuild.parse_tests).to eq(2)
+          expect(@xcodebuild.perfect_build).to be false
+          expect(@dangerfile.status_report[:errors].count).to eq(2+1)
+          expect(@dangerfile.status_report[:errors].first).to eq("Test execution failed with **2** errors 🚨")
+          expect(@dangerfile.status_report[:warnings]).to be_empty
+          expect(@dangerfile.status_report[:messages]).to be_empty
+          expect(@dangerfile.status_report[:markdowns]).to be_empty
+        end
+
       end
 
     end