Add tests

Library/Homebrew/cask/auditor.rb

@@ -58,7 +58,7 @@ module Cask
         sample_languages = if language_blocks.length > LANGUAGE_BLOCK_LIMIT && !@audit_new_cask
           sample_keys = language_blocks.keys.sample(LANGUAGE_BLOCK_LIMIT)
           sample_keys_sentence = ::Utils.to_sentence(sample_keys.map { |lang| lang[0].to_s })
-          ohai "Auditing a sample of available languages: #{sameple_keys_sentence}"
+          ohai "Auditing a sample of available languages: #{sample_keys_sentence}"
           language_blocks.select { |k| sample_keys.include?(k) }
         else
           language_blocks

Library/Homebrew/test/utils_spec.rb

@@ -58,4 +58,51 @@ describe Utils do
       expect(described_class.pluralize("foo", 2, singular: "o", plural: "es")).to eq("fooes")
     end
   end
+
+  describe ".to_sentence" do
+    it "converts a plain array to a sentence" do
+      expect(described_class.to_sentence([])).to eq("")
+      expect(described_class.to_sentence(["one"])).to eq("one")
+      expect(described_class.to_sentence(["one", "two"])).to eq("one and two")
+      expect(described_class.to_sentence(["one", "two", "three"])).to eq("one, two, and three")
+    end
+
+    it "converts an array to a sentence with a custom connector" do
+      expect(described_class.to_sentence(["one", "two", "three"], words_connector: " ")).to eq("one two, and three")
+      expect(described_class.to_sentence(["one", "two", "three"],
+                                         words_connector: " & ")).to eq("one & two, and three")
+    end
+
+    it "converts an array to a sentence with a custom last word connector" do
+      expect(described_class.to_sentence(["one", "two", "three"],
+                                         last_word_connector: ", and also ")).to eq("one, two, and also three")
+      expect(described_class.to_sentence(["one", "two", "three"], last_word_connector: " ")).to eq("one, two three")
+      expect(described_class.to_sentence(["one", "two", "three"],
+                                         last_word_connector: " and ")).to eq("one, two and three")
+    end
+
+    it "converts an array to a sentence with a custom two word connector" do
+      expect(described_class.to_sentence(["one", "two"], two_words_connector: " ")).to eq("one two")
+    end
+
+    it "creates a new string" do
+      elements = ["one"]
+      expect(described_class.to_sentence(elements).object_id).not_to eq(elements[0].object_id)
+    end
+
+    it "converts a non-String to a sentence" do
+      expect(described_class.to_sentence([1])).to eq("1")
+    end
+
+    it "converts an array with blank elements to a sentence" do
+      expect(described_class.to_sentence([nil, "one", "", "two", "three"])).to eq(", one, , two, and three")
+    end
+
+    it "does not return a frozen string" do
+      expect(described_class.to_sentence([])).not_to be_frozen
+      expect(described_class.to_sentence(["one"])).not_to be_frozen
+      expect(described_class.to_sentence(["one", "two"])).not_to be_frozen
+      expect(described_class.to_sentence(["one", "two", "three"])).not_to be_frozen
+    end
+  end
 end