Move waiting for Selenium docker instances into ruby code

.travis.yml

@@ -95,21 +95,11 @@ before_script:
       awesome &
     fi
   - if [[ $CAPYBARA_REMOTE = true ]]; then
-      docker-compose up -d
-
-      TIMEOUT=20
-
-      until wget --spider http://localhost:4444 > /dev/null 2>&1 || [ $TIMEOUT -eq 0 ]; do
-        echo "Waiting for selenium server, $((TIMEOUT--)) remaining attempts...";
-        sleep 1;
-      done
-
-      TIMEOUT=20
-
-      until wget --spider http://localhost:4445 > /dev/null 2>&1 || [ $TIMEOUT -eq 0 ]; do
-        echo "Waiting for selenium server, $((TIMEOUT--)) remaining attempts...";
-        sleep 1;
-      done
+      if [[ $CAPYBARA_FF = true ]]; then
+        docker-compose up -d selenium_firefox;
+      else
+        docker-compose up -d selenium_chrome;
+      fi;
     fi
 
 script: "bundle exec rake travis"

docker-compose.yml

@@ -1,6 +1,4 @@
----
 version: "3"
-
 services:
   selenium_chrome:
     network_mode: "host"

spec/selenium_spec_chrome_remote.rb

@@ -14,11 +14,20 @@ def selenium_port
 end
 
 def ensure_selenium_running!
-  TCPSocket.open(selenium_host, selenium_port)
-rescue
-  raise 'Selenium is not running. ' \
-        "You can run a selenium server easily with: \n" \
-        '  $ docker-compose up -d selenium_chrome'
+  timer = Capybara::Helpers.timer(expire_in: 20)
+  begin
+    TCPSocket.open(selenium_host, selenium_port)
+  rescue
+    if timer.expired?
+      raise 'Selenium is not running. ' \
+          "You can run a selenium server easily with: \n" \
+          '  $ docker-compose up -d selenium_chrome'
+    else
+      puts "Waiting for Selenium docker instance..."
+      sleep 1
+      retry
+    end
+  end
 end
 
 Capybara.register_driver :selenium_chrome_remote do |app|

spec/selenium_spec_firefox_remote.rb

@@ -14,11 +14,20 @@ def selenium_port
 end
 
 def ensure_selenium_running!
-  TCPSocket.open(selenium_host, selenium_port)
-rescue
-  raise 'Selenium is not running. ' \
-        "You can run a selenium server easily with: \n" \
-        '  $ docker-compose up -d selenium_firefox'
+  timer = Capybara::Helpers.timer(expire_in: 20)
+  begin
+    TCPSocket.open(selenium_host, selenium_port)
+  rescue
+    if timer.expired?
+      raise 'Selenium is not running. ' \
+          "You can run a selenium server easily with: \n" \
+          '  $ docker-compose up -d selenium_firefox'
+    else
+      puts "Waiting for Selenium docker instance..."
+      sleep 1
+      retry
+    end
+  end
 end
 
 Capybara.register_driver :selenium_firefox_remote do |app|