Convert all method names to Symbols to test correctly in Ruby <= 1.8.7

* Object#methods returns Strings in Ruby 1.8.7 and below, so in order to
  have accurate tests across all Ruby versions they must be all converted
  to Symbols beforehand.

Author: ferdynton

spec/rspec/rails/assertion_adapter_spec.rb

@@ -3,8 +3,13 @@
 describe RSpec::Rails::MinitestAssertionAdapter do
   include RSpec::Rails::MinitestAssertionAdapter
 
-  RSpec::Rails::Assertions.public_instance_methods.select{|m| m.to_s =~ /^(assert|flunk|refute)/}.each do |m|
-    if m.to_s == "assert_equal"
+  # In Ruby 1.8.7 and below, Object#methods returns Strings instead of Symbols.
+  # They're all converted to Symbols first to ensure we always compare them
+  # correctly.
+  let(:symbolized_methods) { methods.map(&:to_sym) }
+
+  RSpec::Rails::Assertions.public_instance_methods.map(&:to_sym).select{|m| m.to_s =~ /^(assert|flunk|refute)/}.each do |m|
+    if m == :assert_equal
       it "exposes #{m} to host examples" do
         assert_equal 3,3
         expect do
@@ -13,16 +18,16 @@
       end
     else
       it "exposes #{m} to host examples" do
-        expect(methods).to include(m)
+        expect(symbolized_methods).to include(m)
       end
     end
   end
 
   it "does not expose internal methods of Minitest" do
-    expect(methods).not_to include("_assertions")
+    expect(symbolized_methods).not_to include(:_assertions)
   end
 
   it "does not expose Minitest's message method" do
-    expect(methods).not_to include("message")
+    expect(symbolized_methods).not_to include(:message)
   end
 end