Add specs to reach 100% branch coverage

Author: sferik

spec/lib/http/form_data/urlencoded_spec.rb

@@ -5,10 +5,14 @@
 
   let(:data) { { "foo[bar]" => "test" } }
 
-  it "raises ArgumentError when given a non-Hash top-level value" do
+  it "raises ArgumentError when given a non-Enumerable top-level value" do
     expect { described_class.new(42) }.to raise_error(HTTP::FormData::Error)
   end
 
+  it "raises ArgumentError when default encoder receives a non-Hash top-level value" do
+    expect { described_class.encoder.call(42) }.to raise_error(ArgumentError, /value must be a Hash/)
+  end
+
   it "supports any Enumerables of pairs" do
     form_data = described_class.new([%w[foo bar], ["foo", %w[baz moo]]])
 
@@ -95,6 +99,10 @@
     it "switches form encoder implementation" do
       expect(form_data.to_s).to eq('{"foo[bar]":"test"}')
     end
+
+    it "raises ArgumentError when implementation does not respond to #call" do
+      expect { described_class.encoder = "not callable" }.to raise_error(ArgumentError)
+    end
   end
 
   context "with custom instance level encoder" do

spec/support/simplecov.rb

@@ -15,5 +15,6 @@
 
 SimpleCov.start do
   add_filter "/spec/"
-  minimum_coverage 100
+  enable_coverage :branch
+  minimum_coverage :line => 100, :branch => 100
 end