revert json formatter duration to nanoseconds (#968)

Author: RolandArgos

CHANGELOG.md

@@ -16,6 +16,10 @@ Please see [CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CO
 * add snippet interface "async-await"
 * add `--parallel <NUMBER_OF_SLAVES>` option to run tests in parallel. Note this is an experimental feature. See [here](/docs/cli.md#parallel-experimental) for more information
 
+#### Bug Fixes
+
+* revert json formatter duration to nanoseconds
+
 #### Deprecations
 
 * `defineSupportCode` is deprecated. Require/import the individual methods instead

src/formatter/json_formatter.js

@@ -145,7 +145,7 @@ export default class JsonFormatter extends Formatter {
       const { result: { exception, status } } = testStep
       data.result = { status }
       if (testStep.result.duration) {
-        data.result.duration = testStep.result.duration
+        data.result.duration = testStep.result.duration * 1000000
       }
       if (status === Status.FAILED && exception) {
         data.result.error_message = format(exception)

src/formatter/json_formatter_spec.js

@@ -94,7 +94,7 @@ describe('JsonFormatter', function() {
                     name: 'my step',
                     result: {
                       status: 'passed',
-                      duration: 1
+                      duration: 1000000
                     }
                   }
                 ],
@@ -139,7 +139,7 @@ describe('JsonFormatter', function() {
         expect(features[0].elements[0].steps[0].result).to.eql({
           status: 'failed',
           error_message: 'my error',
-          duration: 1
+          duration: 1000000
         })
       })
     })