Merge pull request telus-agcg#99 from syngenta/feat/add-description-s…

…etter-to-major-object

feat: add description setter to MajorObject

lib/gdal/major_object.rb

@@ -75,6 +75,12 @@ def description
       desc
     end
 
+    # @param description [String]
+    # @return [String]
+    def description=(description)
+      FFI::GDAL::GDAL.GDALSetDescription(@c_pointer, description)
+    end
+
     def null?
       @c_pointer.null?
     end

spec/unit/gdal/major_object_spec.rb

@@ -3,7 +3,34 @@
 require "gdal/major_object"
 
 RSpec.describe GDAL::MajorObject do
-  subject { Object.new.extend(described_class) }
+  subject { band.extend(described_class) }
 
-  pending "Add some tests!"
+  let(:driver) { GDAL::Driver.by_name("GTiff") }
+  let(:dataset) { driver.create_dataset("/vsimem/test-#{SecureRandom.uuid}.tif", 1, 1) }
+  let(:band) { dataset.raster_band(1) }
+  after { dataset.close }
+
+  describe "#description" do
+    context "when the object has no description" do
+      it "returns an empty string" do
+        expect(subject.description).to eq("")
+      end
+    end
+
+    context "when the object has a description" do
+      before { subject.description = "This is a description" }
+
+      it "returns the description of the object" do
+        expect(subject.description).to eq("This is a description")
+      end
+    end
+  end
+
+  describe "#description=" do
+    it "sets the description of the object" do
+      expect(subject.description).to eq("")
+      subject.description = "This is a description"
+      expect(subject.description).to eq("This is a description")
+    end
+  end
 end