Reorganize tests

This commit is mainly about splitting up rspec_spec.rb into many files
so we don't have a 3000-line file that we have to manage.

Author: mcmire

spec/integration/rails/active_record_spec.rb

@@ -0,0 +1,19 @@
+require "spec_helper"
+
+RSpec.describe "Integration with Rails's ActiveRecord class", type: :integration do
+  context "when using 'super_diff/rspec-rails'" do
+    include_context "integration with ActiveRecord"
+
+    def make_program(test)
+      make_rspec_rails_test_program(test)
+    end
+  end
+
+  context "when using 'super_diff/active_record'" do
+    include_context "integration with ActiveRecord"
+
+    def make_program(test)
+      make_rspec_active_record_program(test)
+    end
+  end
+end

spec/integration/rails/hash_with_indifferent_access_spec.rb

@@ -0,0 +1,19 @@
+require "spec_helper"
+
+RSpec.describe "Integration with Rails's HashWithIndifferentAccess", type: :integration do
+  context "when using 'super_diff/rspec-rails'" do
+    include_context "integration with HashWithIndifferentAccess"
+
+    def make_program(test)
+      make_rspec_rails_test_program(test)
+    end
+  end
+
+  xcontext "when using 'super_diff/active_support'" do
+    include_context "integration with HashWithIndifferentAccess"
+
+    def make_program(test)
+      make_rspec_active_support_program(test)
+    end
+  end
+end

spec/integration/rspec/be_falsey_matcher_spec.rb

@@ -0,0 +1,49 @@
+require "spec_helper"
+
+RSpec.describe "Integration with RSpec's #be_falsey matcher", type: :integration do
+  context "assuming color is enabled" do
+    it "produces the correct output" do
+      program = make_plain_test_program(<<~TEST.strip)
+        expect(:foo).to be_falsey
+      TEST
+
+      expected_output = build_colored_expected_output(
+        snippet: %|expect(:foo).to be_falsey|,
+        expectation: proc {
+          line do
+            plain "Expected "
+            green %|:foo|
+            plain " to be "
+            red %|falsey|
+            plain "."
+          end
+        },
+      )
+
+      expect(program).to produce_output_when_run(expected_output)
+    end
+  end
+
+  context "if color has been disabled" do
+    it "does not include the color in the output" do
+      program = make_plain_test_program(<<~TEST.strip, color_enabled: false)
+        expect(:foo).to be_falsey
+      TEST
+
+      expected_output = build_uncolored_expected_output(
+        snippet: %|expect(:foo).to be_falsey|,
+        expectation: proc {
+          line do
+            plain "Expected "
+            plain %|:foo|
+            plain " to be "
+            plain %|falsey|
+            plain "."
+          end
+        },
+      )
+
+      expect(program).to produce_output_when_run(expected_output)
+    end
+  end
+end