Merge branch 'master' into blending

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     timeout-minutes: 5
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0']
+        ruby-version: ['2.6', '2.7', '3.0', '3.1']
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -52,6 +52,9 @@ image.save('resized.jpg')
 
 # save it as PNG
 image.save('resized.png')
+
+# save without extension in given format
+image.save('resized', format: 'png')
 ```
 
 ### Image info

spec/rszr_spec.rb

@@ -200,6 +200,26 @@
       end
     end
 
+    it 'saves with given format when saving without extension' do
+      Dir.mktmpdir do |dir|
+        resized_file = Pathname.new(File.join(dir, 'resized'))
+        resized_file.unlink if resized_file.exist?
+        expect(resized_file.exist?).to be(false)
+        expect(@image.save(resized_file.to_s, format: :png)).to be(true)
+        expect(resized_file).to have_format('png')
+      end
+    end
+
+    it 'saves using specified format, overriding extension' do
+      Dir.mktmpdir do |dir|
+        resized_file = Pathname.new(File.join(dir, 'resized.jpg'))
+        resized_file.unlink if resized_file.exist?
+        expect(resized_file.exist?).to be(false)
+        expect(@image.save(resized_file.to_s, format: :png)).to be(true)
+        expect(resized_file).to have_format('png')
+      end
+    end
+
     it 'raises save errors' do
       Dir.mktmpdir do |dir|
         resized_file = Pathname.new(File.join(dir, 'foo', 'bar', 'resized.jpg'))