Not necessarily. A .feature file in Cucumber or SpecFlow describes a feature or user story in the application under test. The steps in the .feature file are implemented in step definition files, which contain the code that will be executed for each step in the scenario.

So, in general, a .feature file maps to one or more step definition files. However, you can also have multiple .feature files that map to the same step definition file, especially when the steps are reused across multiple scenarios.

In summary, there is a one-to-many relationship between .feature files and step definition files, with each .feature file potentially mapping to multiple step definition files.

How can I find a scenario in which step file if they are mapped to multi step files?

It is possible to have multiple feature files with the same scenario name, but it is not recommended as it may cause confusion and make it difficult to understand which scenario belongs to which feature. It is better to give each scenario a unique name, even across different feature files, to clearly identify each scenario. Additionally, it can make it easier to maintain and update the test cases in the future.

What's the construction of a scenario in Gherkin?

In Gherkin, a scenario has a specific construction and follows a specific structure. The general structure of a scenario in Gherkin is as follows:

Scenario: Some description of the scenario
  Given some preconditions
  And some other preconditions
  When some action is taken
  Then some expected outcome should occur
  And some other expected outcome should occur

 The Scenario: line is followed by a brief description of what the scenario is testing. The next lines (Given, When, and Then) are the steps that make up the scenario. Given steps set up the initial conditions for the scenario, When steps describe the action that is taken, and Then steps specify the expected outcome of the action. The And keyword is used to add additional steps to the Given, When, or Then sections.

Each of these steps is written in a simple, declarative sentence structure, and is intended to be easy to read and understand, even for non-technical stakeholders.

How can I share the given across multi scenarios through the Background?

In Gherkin, the Background keyword can be used to define steps that are common to all scenarios in a feature file. This can be used to set up preconditions for the scenarios, and to reduce duplication in the scenario steps.

To share Given steps across multiple scenarios using the Background, you can define the Given steps that you want to share in the Background section, as follows:

Feature: My feature

  Background:
    Given I am logged in as a registered user

  Scenario: My first scenario
    Given I do something
    When I do something else
    Then something should happen

  Scenario: My second scenario
    Given I do something different
    When I do something else again
    Then something else should happen

In the above example, the Given I am logged in as a registered user step is common to both the My first scenario and My second scenario scenarios, and is defined in the Background section. This means that the step will be executed before each scenario, and any subsequent steps in the scenarios will be executed in the context of a logged-in user.

list all keyword in Gherkin with index, and explain them

 https://cucumber.io/docs/gherkin/reference/#keywords

Keywords

Each line that isn’t a blank line has to start with a Gherkin keyword, followed by any text you like. The only exceptions are the free-form descriptions placed underneath Example/Scenario, Background, Scenario Outline and Rule lines.

The primary keywords are:

• Feature
• Rule (as of Gherkin 6)
• Example (or Scenario)
• Given, When, Then, And, But for steps (or *)
• Background
• Scenario Outline (or Scenario Template)
• Examples (or Scenarios)

There are a few secondary keywords as well:

• """ (Doc Strings)
• | (Data Tables)
• @ (Tags)
• # (Comments)