Provide install command for geb plugin to configure selenium drivers

Closes gh-1281

Author: rainboyan

grace-plugin-geb/src/main/scripts/Install.groovy

@@ -0,0 +1,71 @@
+import grails.plugin.geb.GebGrailsPlugin
+
+namespace 'geb'
+description "Install Geb", "grace geb:install"
+visible false
+
+URL gebConfig = GebGrailsPlugin.getResource('/META-INF/templates/GebConfig.groovy')
+File projectDir = executionContext.baseDir
+File resourcesDir = new File(projectDir, 'src/integration-test/resources')
+File gebFile = new File(resourcesDir, 'GebConfig.groovy')
+File buildFile = new File(projectDir, 'build.gradle')
+
+if (!resourcesDir.exists()) {
+    resourcesDir.mkdir()
+}
+
+use(FileCategory) {
+    // Copy GebConfig.groovy to 'src/integration-test/resources'
+    gebFile << gebConfig
+
+    // Set system properties in the build.gradle
+    buildFile.insertAfter 'useJUnitPlatform()', '''
+    systemProperty 'geb.env', System.getProperty('geb.env')
+    systemProperty 'geb.build.reportsDir', reporting.file('geb/integrationTest')'''
+}
+
+
+class FileCategory {
+
+    def static leftShift(File file, URL url) {
+        url.withInputStream { is ->
+            file.withOutputStream { os ->
+                def bs = new BufferedOutputStream(os)
+                bs << is
+            }
+        }
+    }
+
+    def static leftShift(File dest, File src) {
+        src.withInputStream { is ->
+            dest.withOutputStream { os ->
+                def bs = new BufferedOutputStream(os)
+                bs << is
+            }
+        }
+    }
+
+    def static insertAfter(File file, String searchString, String text) {
+        if (!file?.exists()) return
+        String content = file.text
+        if (content?.indexOf(searchString) <= 0) return
+        String before = content.takeBefore(searchString)
+        String after = content.takeAfter(searchString)
+        StringBuffer newContent = new StringBuffer()
+        newContent << before << searchString << text << after
+        file.text = newContent
+    }
+
+    def static insertBefore(File file, String searchString, String text) {
+        if (!file?.exists()) return
+        String content = file.text
+        if (content?.indexOf(searchString) <= 0) return
+        String before = content.takeBefore(searchString)
+        String after = content.takeAfter(searchString)
+        StringBuffer newContent = new StringBuffer()
+        newContent << before << text << searchString << after
+        file.text = newContent
+    }
+}
+
+consoleLogger.addStatus "Copying 'GebConfig.groovy' to 'src/integration-test/resources'"

grace-plugin-geb/src/main/templates/GebConfig.groovy

@@ -0,0 +1,25 @@
+import org.openqa.selenium.chrome.ChromeDriver
+import org.openqa.selenium.chrome.ChromeOptions
+import org.openqa.selenium.firefox.FirefoxDriver
+
+environments {
+
+    // run via “./gradlew -Dgeb.env=chrome iT”
+    chrome {
+        driver = { new ChromeDriver() }
+    }
+
+    // run via “./gradlew -Dgeb.env=chromeHeadless iT”
+    chromeHeadless {
+        driver = {
+            ChromeOptions o = new ChromeOptions()
+            o.addArguments('headless')
+            new ChromeDriver(o)
+        }
+    }
+
+    // run via “./gradlew -Dgeb.env=firefox iT”
+    firefox {
+        driver = { new FirefoxDriver() }
+    }
+}