Add spec coverage on CommandLineRunner

Author: pbrisbin

spec/cc/engine/analyzers/command_line_runner_spec.rb

@@ -0,0 +1,31 @@
+require "spec_helper"
+require "cc/engine/duplication"
+
+module CC::Engine::Analyzers
+  RSpec.describe CommandLineRunner do
+    describe "#run" do
+      it "runs the command on the input and yields the output" do
+        runner = CommandLineRunner.new("cat; echo hi")
+
+        output = runner.run("oh ") { |o| o }
+
+        expect(output).to eq "oh hi\n"
+      end
+
+
+      it "raises on errors" do
+        runner = CommandLineRunner.new("echo error output >&2; false")
+
+        expect { runner.run("") }.to raise_error(
+          ParserError, /code 1:\nerror output/
+        )
+      end
+
+      it "times out commands" do
+        runner = CommandLineRunner.new("sleep 3", 0.01)
+
+        expect { runner.run("") }.to raise_error(Timeout::Error)
+      end
+    end
+  end
+end