How to execute Cucumber feature files in parallel with different browsers and tags?

Executing Cucumber Feature Files in Parallel

Problem: Several cucumber feature files, each associated with different tags, need to be executed in parallel, with specific files assigned to specific browsers.

Solution:

Utilizing the open-source cucumber-jvm-parallel-plugin provides a feature-rich solution for parallel cucumber test execution.

1. Plugin Configuration:

Add the following plugin configuration to the project's Maven pom file:

<code class="xml"><dependency>
    <groupId>com.github.temyers</groupId>
    <artifactId>cucumber-jvm-parallel-plugin</artifactId>
    <version>2.1.0</version>
</dependency>
<plugin>
    <groupId>com.github.temyers</groupId>
    <artifactId>cucumber-jvm-parallel-plugin</artifactId>
    <version>2.1.0</version>
    <executions>
        <execution>
            <id>generateRunners</id>
            <phase>generate-test-sources</phase>
            <goals>
                <goal>generateRunners</goal>
            </goals>
            <configuration>
                <glue>foo, bar</glue>
                <outputDirectory>${project.build.directory}/generated-test-sources/cucumber</outputDirectory>
                <featuresDirectory>src/test/resources/features/</featuresDirectory>
                <cucumberOutputDir>target/cucumber-parallel</cucumberOutputDir>
                <format>json</format>
                <strict>true</monochrome>true</strict>
                <tags>@chrome,@firefox</tags>
                <filterFeaturesByTags>false</filterFeaturesByTags>
                <useTestNG>false</useTestNG>
                <namingScheme>simple</namingScheme>
                <parallelScheme>SCENARIO</parallelScheme>
            </configuration>
        </execution>
    </executions>
</plugin></code>

2. Second Plugin Addition:

Add another plugin that will invoke the runner classes generated by the previous plugin:

<code class="xml"><plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.19</version>
    <configuration>
        <forkCount>5</forkCount>
        <reuseForks>true</reuseForks>
        <includes>
            <include>**/*IT.class</include>
        </includes>
    </configuration>
</plugin></code>

Shared WebDriver Class:

Implement a shared WebDriver class:

<code class="java">public class SharedDriver extends EventFiringWebDriver {

    // Singleton WebDriver instance
    private static WebDriver REAL_DRIVER = null;

    // Closing hook for WebDriver
    private static final Thread CLOSE_THREAD = new Thread() {
        @Override
        public void run() {
            REAL_DRIVER.close();
        }
    };

    // WebDriver setup
    static {
        Runtime.getRuntime().addShutdownHook(CLOSE_THREAD);
    }

    public SharedDriver() {
        super(CreateDriver());
    }

    public static WebDriver CreateDriver() {
        if (REAL_DRIVER == null)
            REAL_DRIVER = new FirefoxDriver();
        setWebDriver(REAL_DRIVER);
        return REAL_DRIVER;
    }

    public static void setWebDriver(WebDriver webDriver) {
        SharedDriver.REAL_DRIVER = webDriver;
    }

    public static WebDriver getWebDriver() {
        return SharedDriver.REAL_DRIVER;
    }

    // Disable closing for shared driver
    @Override
    public void close() {
        if (Thread.currentThread() != CLOSE_THREAD) {
            throw new UnsupportedOperationException("Closing is handled by shutdown hook.");
        }
        super.close();
    }
}</code>

Considerations:

• Number of fork counts (parallel threads) should align with the available hardware resources and registered nodes.
• The grid hub must be started with -DPOOL_MAX=512 or higher for executing a large number (>50) of threads in parallel.

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