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Cucumber Java

Provides annotation-based step definitions. To use, add the cucumber-java dependency to your pom.xml:

<dependencies>
  [...]
    <dependency>
        <groupId>io.cucumber</groupId>
        <artifactId>cucumber-java</artifactId>
        <version>${cucumber.version}</version>
        <scope>test</scope>
    </dependency>
  [...]
</dependencies>

Step Definitions

Declare a step definition by annotating a method. It is possible to use the same method for multiple steps by repeating the annotation. For localized annotations import the annotations from io.cucumber.java.<ISO2 Language Code>.*

Step definitions can take either a Cucumber Expression or a regular expression.

package com.example.app;

import io.cucumber.java.en.Given;
import io.cucumber.java.en.Then;
import io.cucumber.java.en.When;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class CalculatorStepDefinitions {
    private RpnCalculator calc;

    @Given("a calculator I just turned on")
    public void a_calculator_I_just_turned_on() {
        calc = new RpnCalculator();
    }

    @When("I add {int} and {int}")
    public void adding(int arg1, int arg2) {
        calc.push(arg1);
        calc.push(arg2);
        calc.push("+");
    }

    @Then("the result is {int}")
    public void the_result_is(double expected) {
        assertEquals(expected, calc.value());
    }
}

Data tables

Data tables from Gherkin can be accessed by using the DataTable object as the last parameter in a step definition. Depending on the table shape, it can also be accessed as one of the following collections:

List<List<String>> table
List<Map<String, String>> table
Map<String, String> table
Map<String, List<String>> table
Map<String, Map<String, String>> table

For examples of each type see: cucumber-jvm/datatable

package com.example.app;

import io.cucumber.datatable.DataTable;
import io.cucumber.java.en.Given;

public class StepDefinitions {
    
    @Given("a datatable:")
    public void a_data_table(DataTable table){
        
    }
    
    @Given("a datatable as a list of maps:")
    public void a_data_table(List<Map<String, String>> table){
        
    }

    @Given("a datatable as a list of maps:")
    public void a_data_table(Map<String, Map<String, Double>> table){
        
    }
}

Note: In addition to collections of String collections of Integer, Float, BigInteger and BigDecimal, Byte, Short, Long and Double are also supported. Numbers are parsed using the language of the feature file. To use custom types, you can use the annotations discussed in the Data Table Type section below.

Doc strings

Doc strings from Gherkin can be accessed by using the DocString object as a parameter.

package com.example.app;

import io.cucumber.docstring.DocString;
import io.cucumber.java.en.Given;

public class StepDefinitions {
    
    @Given("a docstring:")
    public void a_data_table(DocString docString){
        
    }
}

Hooks

Hooks are executed before or after all scenarios/each scenario/each step. A hook is declared by annotating a method.

Hooks are global, all hooks declared in any step definition class will be executed. The order in which hooks are executed is not defined. An explicit order can be provided by using the order property in the annotation.

BeforeAll / AfterAll

BeforeAll and AfterAll hooks are executed before all scenarios are executed and after all scenarios have been executed. A hook is declared by annotating a method. These methods must be static and do not take any arguments.

package io.cucumber.example;

import io.cucumber.java.AfterAll;
import io.cucumber.java.BeforeAll;

public class StepDefinitions {

    @BeforeAll
    public static void beforeAll() {
        // Runs before all scenarios
    }

    @AfterAll
    public static void afterAll() {
        // Runs after all scenarios
    }
}

Notes:

When used in combination with Junit 5, Maven Surefire, and/or Failsafe use version 3.0.0-M5 or later.
When used in combination with Junit 5 and IntelliJ IDEA, failures in before all and after all hooks do not fail a test run.

Before / After

Before and After hooks are executed before and after each scenario is executed. A hook is declared by annotating a method. This method may take an argument of io.cucumber.java.Scenario. A tag-expression can be used to execute a hook conditionally.

package io.cucumber.example;

import io.cucumber.java.After;
import io.cucumber.java.Before;

public class StepDefinitions {

    @Before("not @zukini")
    public void before(Scenario scenario) {
        scenario.log("Runs before each scenarios *not* tagged with @zukini");
    }

    @After
    public void after(Scenario scenario) {
        scenario.log("Runs after each scenarios");
    }
}

BeforeStep / AfterStep

BeforeStep and AfterStep hooks are executed before and after each step is executed. A hook is declared by annotating a method. This method may take an argument of io.cucumber.java.Scenario. A tag-expression can be used to execute a hook conditionally.

package io.cucumber.example;

import io.cucumber.java.AfterStep;
import io.cucumber.java.BeforeStep;

public class StepDefinitions {

    @BeforeStep("not @zukini")
    public void before(Scenario scenario) {
        scenario.log("Runs before each step in scenarios *not* tagged with @zukini");
    }

    @AfterStep
    public void after(Scenario scenario) {
        scenario.log("Runs after each step");
    }
}

Transformers

Cucumber expression parameters, data tables, and doc strings can be transformed into arbitrary Java objects.

Parameter Type

Parameter types used by Cucumber expressions can be declared by using @ParameterType. The name of the annotated method will be used as the parameter name.

package com.example.app;

import io.cucumber.java.ParameterType;
import io.cucumber.java.en.Given;

import java.time.LocalDate;

public class StepDefinitions {

    @ParameterType("([0-9]{4})-([0-9]{2})-([0-9]{2})")
    public LocalDate iso8601Date(String year, String month, String day) {
        return LocalDate.of(Integer.parseInt(year), Integer.parseInt(month), Integer.parseInt(day));
    }

    @Given("today is {iso8601Date}")
    public void today_is(LocalDate date) {

    }
}

Data Table Type

Using a custom data table type will allow you to convert a table declaring values for fields in an object to a List of that object.

For example, a list of authors:

    Given a list of authors in a table
      | firstName   | lastName | birthDate  |
      | Annie M. G. | Schmidt  | 1911-03-20 |
      | Roald       | Dahl     | 1916-09-13 |

package com.example.app;

import io.cucumber.datatable.DataTable;
import io.cucumber.java.DataTableType;

import java.util.List;
import java.util.Map;

public class StepDefinitions {

    @DataTableType
    public Author authorEntryTransformer(Map<String, String> entry) {
        return new Author(
            entry.get("firstName"),
            entry.get("lastName"),
            entry.get("birthDate"));
    }

    @Given("a list of authors in a table")
    public void aListOfAuthorsInATable(List<Author> authors) {
        
    }
}

Data table types can be declared by annotating a method with @DataTableType. Depending on the parameter type, this will be one of the following:

String -> io.cucumber.datatable.TableCellTranformer
Map<String,String> -> io.cucumber.datatable.TableEntryTransformer
List<String -> io.cucumber.datatable.TableRowTranformer
DataTable -> io.cucumber.datatable.TableTransformer

For a full list of transformations that can be achieved with data table types, see cucumber-jvm/datatable

Default Transformers

Default transformers allow you to specify a transformer that will be used when there is no transformer defined. This can be combined with an object mapper like Jackson to quickly transform well-known string representations to Java objects.

@DefaultParameterTransformer
@DefaultDataTableEntryTransformer
@DefaultDataTableCellTransformer

package com.example.app;

import com.fasterxml.jackson.databind.ObjectMapper;
import io.cucumber.java.DefaultDataTableCellTransformer;
import io.cucumber.java.DefaultDataTableEntryTransformer;
import io.cucumber.java.DefaultParameterTransformer;

import java.lang.reflect.Type;

public class DataTableStepDefinitions {

   private final ObjectMapper objectMapper = new ObjectMapper();

   @DefaultParameterTransformer
   @DefaultDataTableEntryTransformer
   @DefaultDataTableCellTransformer
   public Object defaultTransformer(Object fromValue, Type toValueType) {
       return objectMapper.convertValue(fromValue, objectMapper.constructType(toValueType));
   }
}

Empty Cells

Data tables in Gherkin cannot represent null or an empty string unambiguously. Cucumber will interpret empty cells as null.

The empty string can be represented using a replacement, for example [blank]. The replacement can be configured by setting the replaceWithEmptyString property of DataTableType, DefaultDataTableCellTransformer and DefaultDataTableEntryTransformer. By default, no replacement is configured.

Given some authors
   | name            | first publication |
   | Aspiring Author |                   |
   | Ancient Author  | [blank]           |

package com.example.app;

import io.cucumber.java.DataTableType;
import io.cucumber.java.en.Given;

import java.util.Map;
import java.util.List;

public class DataTableStepDefinitions {

    @DataTableType(replaceWithEmptyString = "[blank]")
    public Author convert(Map<String, String> entry){
      return new Author(
         entry.get("name"),
         entry.get("first publication")
      );
    }
    
    @Given("some authors")
    public void given_some_authors(List<Author> authors){
      // authors = [Author(name="Aspiring Author", firstPublication=null), Author(name="Ancient Author", firstPublication=)]
    }
}

To make use of replacements when converting a data table directly to a list or map of strings, the data table type for String has to be overridden.

Feature: Whitespace
  Scenario: Whitespace in a table
   Given a blank value
     | key | value   |
     | a   | [blank] |

package com.example.app;

import io.cucumber.java.DataTableType;
import io.cucumber.java.en.Given;

import java.util.Map;
import java.util.List;

public class DataTableStepDefinitions {

    @DataTableType(replaceWithEmptyString = "[blank]")
    public String listOfStringListsType(String cell) {
        return cell;
    }

    @Given("a blank value")
    public void given_a_blank_value(Map<String, String> map){
        // map contains { "key":"a", "value": ""}
    }
}

Transposing Tables

A data table can be transposed by annotating the data table parameter (or the parameter the data table will be converted into) with @Transpose. This means the keys will be in the first column rather than the first row.

For example, a table with the fields for a User and a data table type to create a User:

 Given the user is
    | firstname	    | Roberto	|
    | lastname	    | Lo Giacco |
    | nationality	| Italian	|

package com.example.app;

import io.cucumber.java.DataTableType;
import io.cucumber.java.en.Given;
import io.cucumber.java.Transpose;

import java.util.Map;
import java.util.List;

public class DataTableStepDefinitions {

    @DataTableType
    public User convert(Map<String, String> entry){
      return new User(
         entry.get("firstname"),
         entry.get("lastname"),
         entry.get("nationality")
      );
    }
    
    @Given("the user is")
    public void the_user_is(@Transpose User user){
      // user = [User(firstname="Roberto", lastname="Lo Giacco", nationality="Italian")
    }
}

DocString type

Using @DocStringType annotation, it is possible to define transformations to other object types.

Given some more information
  """json
  [
      { 
         "produce": "Cucumbers",
         "weight": "5 Kilo", 
         "price": "1€/Kilo"
      },
      {
         "produce": "Gherkins",
         "weight": "1 Kilo", 
         "price": "5€/Kilo"
      }
  ]
  """
Then some conclusion is drawn
  """json
  {
    "size" : "XL",
    "taste": "delicious",
    "type" : "cucumber salad"
  }
  """

package com.example;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import io.cucumber.java.DocStringType;
import io.cucumber.java.en.Given;
import io.cucumber.java.en.Then;

import java.io.IOException;
import java.util.List;

public class StepDefinitions {

    private final ObjectMapper objectMapper = new ObjectMapper();

    @DocStringType
    public List<Grocery> json(String docString) throws IOException {
        return objectMapper.readValue(docString, new TypeReference<List<Grocery>>() {
        });
    }

    @DocStringType(contentType = "json")
    public FoodItem convertFoodItem(String docString) throws IOException {
        return objectMapper.readValue(docString, new TypeReference<FoodItem>() {
        });
    }

    @Given("some more information")
    public void some_more_information(List<Grocery> groceries) {

    }

    @Then("some conclusion is drawn")
    public void some_conclusion_is_drawn(FoodItem foodItem) {

    }
}

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README.md

Cucumber Java

Step Definitions

Data tables

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Hooks

BeforeAll / AfterAll

Before / After

BeforeStep / AfterStep

Transformers

Parameter Type

Data Table Type

Default Transformers

Empty Cells

Transposing Tables

DocString type

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parent directory

README.md

Cucumber Java

Step Definitions

Data tables

Doc strings

Hooks

BeforeAll / AfterAll

Before / After

BeforeStep / AfterStep

Transformers

Parameter Type

Data Table Type

Default Transformers

Empty Cells

Transposing Tables

DocString type