Shared WebDriver becomes null on second scenario using PicoContainer

问题

I have used the accepted solution here and came up with the following code:

Referenced Libraries:

Feature:

Feature: FeatureA

  Scenario: ScenarioA
    Given 
    When 
    Then

  Scenario: ScenarioB
    Given 
    When 
    Then

BaseStep:

public class BaseStep {
    protected WebDriver driver = null;
    private static boolean isInitialized = false;

    @Before
    public void setUp() throws Exception {
        if (!isInitialized) {
            driver = SeleniumUtil.getWebDriver(ConfigUtil.readKey("browser"));
            isInitialized = true;
        }
    }

    @After
    public void tearDown() {
        driver.quit();
    }

}

StepA:

public class StepA {
    private BaseStep baseStep = null;
    private WebDriver driver = null;

    // PicoContainer injects BaseStep class
    public StepA(BaseStep baseStep) {
        this.baseStep = baseStep;
    }

    @Given("^I am at the Login page$")
    public void givenIAmAtTheLoginPage() throws Exception {
        driver = baseStep.driver;
        driver.get(ConfigUtil.readKey("base_url"));
    }

    @When
    @When
    @Then
    @Then

}

However, the driver "dies" after tearDown() of ScenarioA and becomes null on Given step of ScenarioB (both scenarios use the same Given). I am not using Maven.

回答1:

It's because of this line:

private static boolean isInitialized = false;

For each scenario, cucumber creates a new instance for every step file involved. Hence, the driver in BaseStep is always null when a scenario starts.

The static isInitialized boolean is not part of an instance, it's bound to the class it lives in and it's alive until the JVM shuts down. The first scenario sets it to true, meaning that when the second scenario starts it's still true and it does not reinitialize the driver in the setUp() method.

You probably want to make driver static to share the same instance with both scenarios.

回答2:

From Luciano's answer, this is what I ended up with:

Features:

Feature: FeatureA

  Scenario: ScenarioA
    Given I am at the Login page
    When 
    Then

  Scenario: ScenarioB
    Given I am at the Login page
    When 
    Then


Feature: FeatureB

  Scenario: ScenarioC
    Given I am at the Login page
    When 
    Then

BaseStep:

public class BaseStep {
    protected WebDriver driver = null;

    @Before
    public void setUp() throws Exception {
        driver = SeleniumUtil.getWebDriver(ConfigUtil.readKey("browser"));
    }

    @After
    public void tearDown() {
        driver.quit();
    }

}

Steps:

public class FeatureAStep {
    private WebDriver driver = null;

    // PicoContainer injects BaseStep class
    public FeatureAStep(BaseStep baseStep) {
        this.driver = baseStep.driver;
    }

    @Given("^I am at the Login page$")
    public void givenIAmAtTheLoginPage() throws Exception {
        driver.get(ConfigUtil.readKey("base_url"));
    }

  @When
  @When
  @Then
  @Then
}


public class FeatureBStep {
    private WebDriver driver = null;

    // PicoContainer injects BaseStep class
    public FeatureBStep(BaseStep baseStep) {
        this.driver = baseStep.driver;
    }

  @When
  @Then
}

I have 2 Feature files and 2 Step Definition classes. ScenarioC shares the same Given from Scenarios A and B that is defined in FeatureAStep. When and Then of ScenarioC is defined in FeatureBStep. I did not make the WebDriver static in BaseStep using PicoContainer. Both Feature files executed successfully.

Related Reading:

Cucumber: You're not allowed to extend classes that define step definitions or hooks
Dependency Injection-Cucumber
Sharing selenium Webdriver instance using PicoContainer in Cucumber

来源：https://stackoverflow.com/questions/45780919/shared-webdriver-becomes-null-on-second-scenario-using-picocontainer

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java

selenium

cucumber

picocontainer