Add to_kegs test

Library/Homebrew/test/cli/named_args_spec.rb

@@ -176,6 +176,26 @@ describe Homebrew::CLI::NamedArgs do
     end
   end
 
+  describe "#to_kegs" do
+    before do
+      (HOMEBREW_CELLAR/"foo/1.0").mkpath
+      (HOMEBREW_CELLAR/"foo/2.0").mkpath
+      (HOMEBREW_CELLAR/"bar/1.0").mkpath
+    end
+
+    it "resolves kegs with #resolve_kegs" do
+      expect(described_class.new("foo", "bar").to_kegs.map(&:name)).to eq ["foo", "foo", "bar"]
+    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"]
+    end
+
+    it "when there are no matching kegs returns an array of Kegs" do
+      expect(described_class.new.to_kegs).to be_empty
+    end
+  end
+
   describe "#to_default_kegs" do
     before do
       (HOMEBREW_CELLAR/"foo/1.0").mkpath