Simplify test suite after dropping rails 3 support

Also, the only version of rails 4 that we test against is 4.2, so
we can drop the conditional around `ActiveRecord::Enum`.

spec/models/post_with_status_spec.rb

@@ -1,49 +1,45 @@
 require "rails_helper"
 
-# This model tests ActiveRecord::Enum, which was added in AR 4.1
-# http://edgeguides.rubyonrails.org/4_1_release_notes.html#active-record-enums
 describe PostWithStatus, type: :model do
-  if defined?(ActiveRecord::Enum)
-    with_versioning do
-      let(:post) { described_class.create!(status: "draft") }
+  with_versioning do
+    let(:post) { described_class.create!(status: "draft") }
 
-      it "should stash the enum value properly in versions" do
+    it "should stash the enum value properly in versions" do
+      post.published!
+      post.archived!
+      expect(post.paper_trail.previous_version.published?).to be true
+    end
+
+    it "can read enums in version records written by PT 4" do
+      post = described_class.create(status: "draft")
+      post.published!
+      version = post.versions.last
+      # Simulate behavior PT 4, which used to save the string version of
+      # enums to `object_changes`
+      version.update(object_changes: "---\nid:\n- \n- 1\nstatus:\n- draft\n- published\n")
+      assert_equal %w(draft published), version.changeset["status"]
+    end
+
+    context "storing enum object_changes" do
+      subject { post.versions.last }
+
+      it "should stash the enum value properly in versions object_changes" do
         post.published!
         post.archived!
-        expect(post.paper_trail.previous_version.published?).to be true
+        expect(subject.changeset["status"]).to eql %w(published archived)
       end
+    end
 
-      it "can read enums in version records written by PT 4" do
-        post = described_class.create(status: "draft")
-        post.published!
-        version = post.versions.last
-        # Simulate behavior PT 4, which used to save the string version of
-        # enums to `object_changes`
-        version.update(object_changes: "---\nid:\n- \n- 1\nstatus:\n- draft\n- published\n")
-        assert_equal %w(draft published), version.changeset["status"]
-      end
-
-      context "storing enum object_changes" do
-        subject { post.versions.last }
-
-        it "should stash the enum value properly in versions object_changes" do
-          post.published!
-          post.archived!
-          expect(subject.changeset["status"]).to eql %w(published archived)
-        end
-      end
-
-      describe "#touch_with_version" do
-        it "preserves the enum value (and all other attributes)" do
-          post = described_class.create(status: :draft)
-          expect(post.versions.count).to eq(1)
-          expect(post.status).to eq("draft")
-          Timecop.travel 1.second.since # because MySQL lacks fractional seconds precision
-          post.paper_trail.touch_with_version
-          expect(post.versions.count).to eq(2)
-          expect(post.versions.last[:object]).to include("status: 0")
-          expect(post.paper_trail.previous_version.status).to eq("draft")
-        end
+    describe "#touch_with_version" do
+      it "preserves the enum value (and all other attributes)" do
+        post = described_class.create(status: :draft)
+        expect(post.versions.count).to eq(1)
+        expect(post.status).to eq("draft")
+        Timecop.travel 1.second.since # because MySQL lacks fractional seconds precision
+        post.paper_trail.touch_with_version
+        expect(post.versions.count).to eq(2)
+        expect(post.versions.last[:object]).to include("status: 0")
+        expect(post.paper_trail.previous_version.status).to eq("draft")
       end
     end
   end

test/dummy/app/models/post_with_status.rb

@@ -1,8 +1,7 @@
+# This model tests ActiveRecord::Enum, which was added in AR 4.1
+# http://edgeguides.rubyonrails.org/4_1_release_notes.html#active-record-enums
 class PostWithStatus < ActiveRecord::Base
   has_paper_trail
 
-  # ActiveRecord::Enum is only supported in AR4.1+
-  if defined?(ActiveRecord::Enum)
-    enum status: { draft: 0, published: 1, archived: 2 }
-  end
+  enum status: { draft: 0, published: 1, archived: 2 }
 end

test/dummy/app/models/widget.rb

@@ -1,16 +1,8 @@
 class Widget < ActiveRecord::Base
+  EXCLUDED_NAME = "Biglet".freeze
   has_paper_trail
   has_one :wotsit
+  has_many :fluxors, -> { order(:name) }
   has_many :whatchamajiggers, as: :owner
-
-  EXCLUDED_NAME = "Biglet".freeze
-
   validates :name, exclusion: { in: [EXCLUDED_NAME] }
-
-  # `has_many` syntax for specifying order uses a lambda in Rails 4
-  if ::ActiveRecord::VERSION::MAJOR >= 4
-    has_many :fluxors, -> { order(:name) }
-  else
-    has_many :fluxors, order: :name
-  end
 end