color_printer_spec: add more specs

Some code paths were not covered by unit tests.

spec/color_printer_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe Pry::ColorPrinter do
         end
       end
 
-      it "prints a string" do
+      it "prints a string with a newline" do
         described_class.pp(healthy_class.new, output)
         expect(output.string).to eq("string\n")
       end
@@ -40,5 +40,60 @@ RSpec.describe Pry::ColorPrinter do
           .to match(/\A\e\[32m#<BasicObject:0x.+>\e\[0m\e\[0m\n\z/)
       end
     end
+
+    context "when #inspect returns an object literal" do
+      let(:klass) do
+        Class.new do
+          def inspect
+            '#<Object:0x00007fe86bab53c8>'
+          end
+        end
+      end
+
+      it "prints the object inspect" do
+        described_class.pp(klass.new, output)
+        expect(output.string).to eq("\e[32m#<Object:0x00007fe86bab53c8>\e[0m\n")
+      end
+
+      context "and when SyntaxHighlighter returns a token starting with '\e'" do
+        before do
+          expect(Pry::SyntaxHighlighter).to receive(:keyword_token_color)
+            .and_return("\e[32m")
+        end
+
+        it "prints the object as is" do
+          described_class.pp(klass.new, output)
+          expect(output.string).to eq("\e[32m#<Object:0x00007fe86bab53c8>\e[0m\n")
+        end
+      end
+
+      context "and when SyntaxHighlighter returns a token that doesn't start with '\e'" do
+        before do
+          expect(Pry::SyntaxHighlighter).to receive(:keyword_token_color)
+            .and_return('token')
+        end
+
+        it "prints the object with escape characters" do
+          described_class.pp(klass.new, output)
+          expect(output.string)
+            .to eq("\e[0m\e[0;tokenm#<Object:0x00007fe86bab53c8>\e[0m\n")
+        end
+      end
+    end
+
+    context "when #inspect raises Pry::Pager::StopPaging" do
+      let(:klass) do
+        Class.new do
+          def inspect
+            raise Pry::Pager::StopPaging
+          end
+        end
+      end
+
+      it "propagates the error" do
+        expect { described_class.pp(klass.new, output) }
+          .to raise_error(Pry::Pager::StopPaging)
+      end
+    end
   end
 end