Update to the latest version of RSpec and Bundler.

.travis.yml

@@ -1,4 +1,8 @@
 rvm:
+  - "3.2"
+  - "3.1"
+  - "3.0"
+  - "2.7"
   - "2.6"
   - "2.5"
   - "2.4"

Gemfile

@@ -4,8 +4,9 @@ gemspec
 
 group :test do
   gem "rake"
-  gem "rspec", "~> 2"
-  gem "rspec-core", "~> 2"
+  gem "rspec", "~> 3"
+  gem "rspec-core", "~> 3"
+  gem "rexml"
   gem "mocha"
   gem "rack", ">= 1.6.11"
 end

Gemfile.lock

@@ -1,23 +1,31 @@
 PATH
   remote: .
   specs:
-    imgkit (1.6.2)
+    imgkit (1.6.3)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.1.2)
-    mocha (0.9.12)
-    rack (2.0.6)
-    rake (0.9.2.2)
-    rspec (2.6.0)
-      rspec-core (~> 2.6.0)
-      rspec-expectations (~> 2.6.0)
-      rspec-mocks (~> 2.6.0)
-    rspec-core (2.6.4)
-    rspec-expectations (2.6.0)
-      diff-lcs (~> 1.1.2)
-    rspec-mocks (2.6.0)
+    diff-lcs (1.5.0)
+    mocha (2.1.0)
+      ruby2_keywords (>= 0.0.5)
+    rack (3.0.8)
+    rake (13.0.6)
+    rexml (3.2.6)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
+    ruby2_keywords (0.0.5)
 
 PLATFORMS
   ruby
@@ -27,8 +35,9 @@ DEPENDENCIES
   mocha
   rack (>= 1.6.11)
   rake
-  rspec (~> 2)
-  rspec-core (~> 2)
+  rexml
+  rspec (~> 3)
+  rspec-core (~> 3)
 
 BUNDLED WITH
-   2.1.4
+   2.4.19

spec/configuration_spec.rb

@@ -7,51 +7,51 @@
       let(:system_path_with_bundler_warning) { "`/` is not writable.\nBundler will use `/tmp/bundler/home/unknown' as your home directory temporarily.\n/path/to/wkhtmltoimage\n" }
 
       before(:each) do
-        subject.stub :` => system_path
+        allow(subject).to receive(:`).and_return(system_path)
       end
 
       context "with Bundler" do
         before(:each) do
-          subject.stub :using_bundler? => true
+          allow(subject).to receive(:using_bundler?).and_return(true)
         end
 
         it "should return the result of `bundle exec which wkhtmltoimage` with whitespace stripped" do
-          subject.should_receive(:`).with("bundle exec which wkhtmltoimage")
-          subject.wkhtmltoimage.should == system_path.chomp
+          expect(subject).to receive(:`).with("bundle exec which wkhtmltoimage")
+          expect(subject.wkhtmltoimage).to eq system_path.chomp
         end
 
         context "with warning" do
           before(:each) do
-            subject.stub :` => system_path_with_bundler_warning
+            allow(subject).to receive(:`).and_return(system_path_with_bundler_warning)
           end
 
           it "should return the result of `bundle exec which wkhtmltoimage` with warning stripped" do
-            subject.should_receive(:`).with("bundle exec which wkhtmltoimage")
-            subject.wkhtmltoimage.should == system_path.chomp
+            expect(subject).to receive(:`).with("bundle exec which wkhtmltoimage")
+            expect(subject.wkhtmltoimage).to eq system_path.chomp
           end
         end
       end
 
       context "without Bundler" do
         before(:each) do
-          subject.stub :using_bundler? => false
+          allow(subject).to receive(:using_bundler?).and_return(false)
         end
 
         it "should return the result of `which wkhtmltoimage` with whitespace stripped" do
-          subject.should_receive(:`).with("which wkhtmltoimage")
-          subject.wkhtmltoimage.should == system_path.chomp
+          expect(subject).to receive(:`).with("which wkhtmltoimage")
+          expect(subject.wkhtmltoimage).to eq system_path.chomp
         end
       end
     end
 
     context "system version does not exist" do
       before(:each) do
-        subject.stub :` => "\n"
-        subject.stub :using_bundler? => false
+        allow(subject).to receive(:`).and_return("\n")
+        allow(subject).to receive(:using_bundler?).and_return(false)
       end
 
       it "should return the fallback path" do
-        subject.wkhtmltoimage.should == "/usr/local/bin/wkhtmltoimage"
+        expect(subject.wkhtmltoimage).to eq "/usr/local/bin/wkhtmltoimage"
       end
     end
 
@@ -63,8 +63,8 @@
       end
 
       it "should not check the system version and return the explicit path" do
-        subject.should_not_receive(:`)
-        subject.wkhtmltoimage.should == explicit_path
+        expect(subject).to_not receive(:`)
+        expect(subject.wkhtmltoimage).to eq explicit_path
       end
     end
   end