Handle failed requests

test/manifique_test.rb

@@ -1,6 +1,7 @@
 require "test_helper"
 
 class ManifiqueTest < Minitest::Test
+
   def test_that_it_has_a_version_number
     refute_nil ::Manifique::VERSION
   end
@@ -13,8 +14,19 @@ class ManifiqueTest < Minitest::Test
     assert_raises(RuntimeError) { Manifique::Agent.new(url: "htp:/foo.com") }
   end
 
-  def test_fetch_metadata
-    agent = Manifique::Agent.new(url: 'https://example.com')
-    assert_equal agent.fetch_metadata, 'https://example.com'
+  def test_fetch_metadata_request_404
+    stub_request(:get, "http://example.com/404").
+      to_return(body: "", status: 404, headers: {})
+
+    agent = Manifique::Agent.new(url: 'http://example.com/404')
+    assert_raises(RuntimeError) { agent.fetch_metadata }
+  end
+
+  def test_fetch_metadata_request_500
+    stub_request(:get, "http://example.com/500").
+      to_return(body: "", status: 500, headers: {})
+
+    agent = Manifique::Agent.new(url: 'http://example.com/500')
+    assert_raises(RuntimeError) { agent.fetch_metadata }
   end
 end