Fix tests

Library/Homebrew/test/cli/named_args_spec.rb

@@ -188,7 +188,7 @@ describe Homebrew::CLI::NamedArgs do
     end
 
     it "resolves kegs with multiple versions with #resolve_keg" do
-      expect(described_class.new("foo").to_kegs.map { |k| k.version.version }).to eq ["1.0", "2.0"]
+      expect(described_class.new("foo").to_kegs.map { |k| k.version.version.to_s }).to eq ["1.0", "2.0"]
     end
 
     it "when there are no matching kegs returns an empty array" do
@@ -209,6 +209,10 @@ describe Homebrew::CLI::NamedArgs do
       expect(described_class.new("foo", "bar").to_default_kegs.map(&:name)).to eq ["foo", "bar"]
     end
 
+    it "resolves the default keg" do
+      expect(described_class.new("foo").to_default_kegs.map { |k| k.version.version.to_s }).to eq ["2.0"]
+    end
+
     it "when there are no matching kegs returns an empty array" do
       expect(described_class.new.to_default_kegs).to be_empty
     end