test: cover WidgetsController, show and ResponderTest

test/test_responder.rb

@@ -0,0 +1,60 @@
+require 'minitest/autorun'
+require 'prism'
+
+class ResponderTest < Minitest::Test
+  def test_dispatches_to_matching_format_block
+    responder = Prism::Responder.new
+    responder.html { 'html-body' }
+    responder.json { 'json-body' }
+
+    assert_equal 'html-body', responder.respond(:html)
+    assert_equal 'json-body', responder.respond(:json)
+  end
+
+  def test_unknown_format_raises
+    responder = Prism::Responder.new
+    responder.html { 'html-body' }
+
+    assert_raises(Prism::Responder::UnknownFormat) { responder.respond(:json) }
+  end
+
+  def test_any_without_args_is_a_catch_all_fallback
+    responder = Prism::Responder.new
+    responder.html { 'html-body' }
+    responder.any { 'fallback' }
+
+    assert_equal 'html-body', responder.respond(:html)
+    assert_equal 'fallback', responder.respond(:json)
+    assert_equal 'fallback', responder.respond(:xml)
+  end
+
+  def test_any_with_explicit_formats_only_fills_those_in
+    responder = Prism::Responder.new
+    responder.any(:json, :xml) { 'api-fallback' }
+
+    assert_equal 'api-fallback', responder.respond(:json)
+    assert_equal 'api-fallback', responder.respond(:xml)
+    assert_raises(Prism::Responder::UnknownFormat) { responder.respond(:html) }
+  end
+
+  def test_any_does_not_override_an_explicit_block
+    responder = Prism::Responder.new
+    responder.json { 'explicit' }
+    responder.any { 'fallback' }
+
+    assert_equal 'explicit', responder.respond(:json)
+  end
+
+  def test_handles_predicate
+    responder = Prism::Responder.new
+    responder.html { 'x' }
+
+    assert responder.handles?(:html)
+    refute responder.handles?(:json)
+  end
+
+  def test_calling_a_format_method_without_a_block_raises
+    responder = Prism::Responder.new
+    assert_raises(NoMethodError) { responder.frobnicate }
+  end
+end