Allow chains to be returned from step definitions

Author: badeball

features/issues/713.feature

@@ -0,0 +1,17 @@
+# https://github.com/badeball/cypress-cucumber-preprocessor/issues/713
+
+Feature: returning chains
+  Scenario: returning a chain
+    Given a file named "cypress/integration/a.feature" with:
+      """
+      Feature: a feature
+        Scenario: a scenario
+          Given a step
+      """
+    And a file named "cypress/support/step_definitions/steps.js" with:
+      """
+      const { Given } = require("@badeball/cypress-cucumber-preprocessor");
+      Given("a step", () => cy.log("foo"))
+      """
+    When I run cypress
+    Then it passes

lib/create-tests.ts

@@ -474,16 +474,17 @@ function createPickle(
           return cy.wrap(start, { log: false });
         })
           .then((start) => {
-            return cy
-              .wrap(registry.runStepDefininition(this, text, argument), {
-                log: false,
-              })
-              .then((result: any) => {
-                return {
-                  start,
-                  result,
-                };
-              });
+            const ensureChain = (value: any): Cypress.Chainable<any> =>
+              Cypress.isCy(value) ? value : cy.wrap(value);
+
+            return ensureChain(
+              registry.runStepDefininition(this, text, argument)
+            ).then((result: any) => {
+              return {
+                start,
+                result,
+              };
+            });
           })
           .then(({ start, result }) => {
             const end = createTimestamp();