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Setup step delcarations for cucumber-java-lambda
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‎java-lambda/README.md

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Cucumber Java8
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==============
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Provides lambda based step definitions. To use add the `cucumber-java8` dependency to your pom.xml:
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```xml
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<dependencies>
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[...]
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-java8</artifactId>
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<version>${cucumber.version}</version>
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<scope>test</scope>
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</dependency>
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[...]
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</dependencies>
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```
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## Step Definitions
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Declare a step definition calling a method in the constructor of the glue class.
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For localized methods import the interface from `io.cucumber.java8.<ISO2 Language Code>`
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Data tables and Docstrings from Gherkin can be accessed by using a `DataTable`
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or `DocString` object as the last parameter.
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```java
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package com.example.app;
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import io.cucumber.java8.En;
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import io.cucumber.datatable.DataTable;
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import io.cucumber.docstring.DocString;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class StepDefinitions implements En {
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private RpnCalculator calc;
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public RpnCalculatorSteps() {
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Given("a calculator I just turned on", () -> {
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calc = new RpnCalculator();
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});
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When("I add {int} and {int}", (Integer arg1, Integer arg2) -> {
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calc.push(arg1);
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calc.push(arg2);
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calc.push("+");
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});
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Then("the result is {double}", (Double expected) -> assertEquals(expected, calc.value()));
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Given("the previous entries:", (DataTable dataTable) -> {
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List<Entry> entries = dataTable.asList(Entry.class);
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...
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});
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Then("the calculation log displays:", (DocString docString) -> {
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...
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});
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}
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}
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```
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## Hooks
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Declare hooks that will be executed before/after each scenario/step by calling a
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method in the constructor. The method may declare an argument of type `io.cucumber.java8.Scenario`.
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* `Before`
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* `After`
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* `BeforeStep`
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* `AfterStep`
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## Transformers
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### Parameter Type
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Step definition parameter types can be declared by using `ParameterType`.
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```java
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package com.example.app;
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import io.cucumber.java8.En;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class StepDefinitions implements En {
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public StepDefinitions() {
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ParameterType("amount", "(\\d+\\.\\d+)\\s([a-zA-Z]+)", (String[] values) ->
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new Amount(new BigDecimal(values[0]), Currency.getInstance(values[1])));
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}
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}
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```
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### Data Table Type
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Data table types can be declared by calling `DataTableType` in the constructor.
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Depending on the lambda type this will be either a:
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* `String` -> `io.cucumber.datatable.TableCellTranformer`
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* `Map<String,String>` -> `io.cucumber.datatable.TableEntry`
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* `List<String>` -> `io.cucumber.datatable.TableRow`
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* `DataTable` -> `io.cucumber.datatable.TableTransformer`
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```java
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package com.example.app;
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import io.cucumber.java8.En;
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import java.util.Map;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class StepDefinitions implements En {
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public StepDefinitions() {
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DataTableType((Map<String, String> row) -> new Grocery(
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row.get("name"),
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Price.fromString(row.get("price"))
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));
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}
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}
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```
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### Default Transformers
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Default transformers allow you to specific a transformer that will be used when
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there is no transform defined. This can be combined with an object mapper like
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Jackson to quickly transform well known string representations to Java objects.
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* `DefaultParameterTransformer`
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* `DefaultDataTableEntryTransformer`
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* `DefaultDataTableCellTransformer`
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For a full list of transformations that can be achieved with data table types
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see [cucumber/datatable](https://github.com/cucumber/cucumber/tree/master/datatable)
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```java
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package com.example.app;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import io.cucumber.java8.En;
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public class StepDefinitions implements En {
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public StepDefinitions() {
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final ObjectMapper objectMapper = new ObjectMapper();
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DefaultParameterTransformer((fromValue, toValueType) ->
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objectMapper.convertValue(fromValue, objectMapper.constructType(toValueType))
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);
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}
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}
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```
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### Empty Cells
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Data tables in Gherkin can not represent null or the empty string unambiguously.
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Cucumber will interpret empty cells as `null`.
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Empty string be represented using a replacement. For example `[empty]`.
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The replacement can be configured providing the `replaceWithEmptyString`
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argument of `DataTableType`, `DefaultDataTableCellTransformer` and
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`DefaultDataTableEntryTransformer`. By default no replacement is configured.
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```gherkin
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Given some authors
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| name | first publication |
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| Aspiring Author | |
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| Ancient Author | [blank] |
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```
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```java
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package com.example.app;
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import io.cucumber.datatable.DataTable;
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import io.cucumber.java8.En;
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import java.util.List;
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import java.util.Map;
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import java.util.Optional;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotSame;
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import static org.junit.jupiter.api.Assertions.assertSame;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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public class StepDefinitions implements En {
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public StepDefinitions() {
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DataTableType("[blank]", (Map<String, String> entry) -> new Author(
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entry.get("name"),
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entry.get("first publication")
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));
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Given("some authors", (DataTable authorsTable) -> {
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List<Author> authors = authorsTable.asList(Author.class);
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// authors = [Author(name="Aspiring Author", firstPublication=null), Author(name="Ancient Author", firstPublication=)]
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});
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}
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}
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```
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# Transposing Tables
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A data table can be transposed by calling `.transpose()`. This means the keys
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will be in the first column rather then the first row.
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```gherkin
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Given the user is
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| firstname | Roberto |
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| lastname | Lo Giacco |
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| nationality | Italian |
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```
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And a data table type to create a User
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```java
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package com.example.app;
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import io.cucumber.datatable.DataTable;
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import io.cucumber.java8.En;
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import java.util.List;
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import java.util.Map;
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import java.util.Optional;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotSame;
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import static org.junit.jupiter.api.Assertions.assertSame;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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public class StepDefinitions implements En {
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public StepDefinitions() {
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DataTableType((Map<String, String> entry) -> new User(
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entry.get("firstname"),
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entry.get("lastname")
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entry.get("nationality")
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));
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Given("the user is", (DataTable authorsTable) -> {
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User user = authorsTable.transpose().asList(User.class);
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// user = User(firstname="Roberto", lastname="Lo Giacco", nationality="Italian")
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});
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}
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}
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```

‎java-lambda/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-jvm</artifactId>
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<version>7.3.3-SNAPSHOT</version>
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</parent>
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<artifactId>cucumber-java-lambda</artifactId>
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<packaging>jar</packaging>
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<name>Cucumber-JVM: Java Lambda</name>
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<properties>
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<project.Automatic-Module-Name>io.cucumber.lambda</project.Automatic-Module-Name>
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<apiguardian-api.version>1.1.2</apiguardian-api.version>
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<junit-jupiter.version>5.8.2</junit-jupiter.version>
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<typetools.version>0.6.3</typetools.version>
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<assertj.version>3.22.0</assertj.version>
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</properties>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-bom</artifactId>
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<version>${project.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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<dependency>
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<groupId>org.junit</groupId>
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<artifactId>junit-bom</artifactId>
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<version>${junit-jupiter.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-core</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apiguardian</groupId>
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<artifactId>apiguardian-api</artifactId>
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<version>${apiguardian-api.version}</version>
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</dependency>
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<dependency>
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<groupId>net.jodah</groupId>
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<artifactId>typetools</artifactId>
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<version>${typetools.version}</version>
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</dependency>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-junit-platform-engine</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.platform</groupId>
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<artifactId>junit-platform-suite</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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</dependency>
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</dependencies>
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</project>

‎java-lambda/src/main/java/io/cucumber/lambda/Invoker.java

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package io.cucumber.lambda;
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import io.cucumber.core.backend.CucumberBackendException;
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import io.cucumber.core.backend.CucumberInvocationTargetException;
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import io.cucumber.core.backend.Located;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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final class Invoker {
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private Invoker() {
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}
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static Object invoke(Located located, Object target, Method method, Object... args) {
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boolean accessible = method.canAccess(target);
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try {
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method.setAccessible(true);
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return method.invoke(target, args);
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} catch (IllegalArgumentException | IllegalAccessException e) {
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throw new CucumberBackendException("Failed to invoke " + located.getLocation(), e);
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} catch (InvocationTargetException e) {
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throw new CucumberInvocationTargetException(located, e);
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} finally {
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method.setAccessible(accessible);
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}
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}
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}

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