Update to run multiple instances of same webdriver

spec/features/session_spec.cr

@@ -0,0 +1,33 @@
+require "../spec_helper"
+
+module Selenium::Command
+  describe "session", tags: "feature" do
+    it "run multiple browsers on separate process" do
+      TestServer.route "/home", "<h1>The Title</h1>"
+      TestServer.route "/next-page", "<h1>You made it!</h1>"
+      TestServer.route "/action-page", <<-HTML
+        <a href="/next-page">Click Me!</a>
+      HTML
+
+      begin
+        driver1, args1 = Selenium::TestDriverFactory.build(ENV["SELENIUM_BROWSER"]? || "chrome")
+        session1 = driver1.not_nil!.create_session(args: args1.not_nil!)
+        driver2, args2 = Selenium::TestDriverFactory.build(ENV["SELENIUM_BROWSER"]? || "chrome")
+        session2 = driver2.not_nil!.create_session(args: args2.not_nil!)
+
+        session1.navigate_to("http://localhost:3002/home")
+        session2.navigate_to("http://localhost:3002/action-page")
+        element = session2.find_element(:link_text, "Click Me!")
+        element.click
+        session1.current_url.should eq("http://localhost:3002/home")
+        session2.current_url.should eq("http://localhost:3002/next-page")
+      ensure
+        session1.try &.delete
+        driver1.try &.stop
+        session2.try &.delete
+        driver2.try &.stop
+        TestServer.reset
+      end
+    end
+  end
+end

src/selenium/service.cr

@@ -20,6 +20,7 @@ abstract class Selenium::Service
   end
 
   def start
+    find_free_port
     start_process
     verify_running
   end
@@ -37,6 +38,12 @@ abstract class Selenium::Service
 
   abstract def default_port : Int32
 
+  private def find_free_port
+    while listening?
+      @port += 1
+    end
+  end
+
   private def start_process
     @process = Process.new(
       @driver_path,