Add specs for Data#with

Author: eregon

spec/ruby/core/data/with_spec.rb

@@ -0,0 +1,35 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+ruby_version_is "3.2" do
+  describe "Data#with" do
+    it "returns self if given no arguments" do
+      data = DataSpecs::Measure.new(amount: 42, unit: "km")
+      data = data.with.should.equal?(data)
+    end
+
+    it "accepts keyword arguments" do
+      data = DataSpecs::Measure.new(amount: 42, unit: "km")
+      data = data.with(amount: 4, unit: "m")
+
+      data.amount.should == 4
+      data.unit.should == "m"
+    end
+
+    it "accepts String keyword arguments" do
+      data = DataSpecs::Measure.new(amount: 42, unit: "km")
+      data = data.with("amount" => 4, "unit" => "m")
+
+      data.amount.should == 4
+      data.unit.should == "m"
+    end
+
+    it "raises ArgumentError if no keyword arguments are given" do
+      data = DataSpecs::Measure.new(amount: 42, unit: "km")
+
+      -> {
+        data.with(4, "m")
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 2, expected 0)")
+    end
+  end
+end