Flesh out change_geometry_spec.
RSpec.describe Magick::Image, "#change_geometry" do
- it "works" do
- image = described_class.new(20, 20)
+ it "passes the original image to the block" do
+ image = build_image
+ block_image = nil
+ image.change_geometry('400x400') do |_cols, _rows, inner_image|
+ block_image = inner_image
+ end
+
+ expect(block_image).to be(image)
+ end
+
+ it "returns the result from the block" do
+ image = build_image
+
+ result = image.change_geometry('400x400') { "some_result" }
+
+ expect(result).to eq("some_result")
+ end
+
+ it "does not directly modify the original image" do
+ image = build_image
+
+ image.change_geometry('400x400') {}
+
+ expect([image.rows, image.columns]).to eq([2, 2])
+ end
+
+ it "passes dimensions to enable enlarging the image" do
+ image = build_image
+
+ resized_image = image.change_geometry('400x400') do |cols, rows, block_image|
+ block_image.resize(cols, rows)
+ end
- expect { image.change_geometry('sss') }.to raise_error(ArgumentError)
- expect { image.change_geometry('100x100') }.to raise_error(LocalJumpError)
+ expect([resized_image.rows, resized_image.columns]).to eq([400, 400])
+ end
+
+ it "passes dimensions that will maintain the aspect ratio" do
+ image = build_image
+
+ image.change_geometry('300x4000') do |cols, rows|
+ image.resize!(cols, rows)
+ end
+
+ expect([image.rows, image.columns]).to eq([300, 300])
+ end
+
+ it "accepts a Geometry object that maintains the aspect ratio" do
+ image = build_image
+
+ image.change_geometry(Magick::Geometry.new(300, 4000)) do |cols, rows|
+ image.resize!(cols, rows)
+ end
+
+ expect([image.rows, image.columns]).to eq([300, 300])
+ end
+
+ it "raises an error when extra arguments are passed" do
+ image = build_image
+
+ expect { image.change_geometry('400x400', "boo") {} }
+ .to raise_error(ArgumentError)
+ end
- result = image.change_geometry('100x100') { 1 }
- expect(result).to eq(1)
+ it "raises an error when no block is passed" do
+ image = build_image
- expect { image.change_geometry([]) }.to raise_error(ArgumentError)
+ expect { image.change_geometry('400x400') }
+ .to raise_error(LocalJumpError)
end
end
