improved docs about native data tables

Example/Tests/StepDefinitions/SanitySteps.swift

@@ -234,10 +234,10 @@ final class SanitySteps: StepDefiner {
             XCTAssertEqual(
                 match.values,
                 [
-                    "KMSY": [ "lat": "29.993333", "lon": "-90.258056" ],
-                    "KSFO": [ "lat": "37.618889", "lon": "-122.375000" ],
-                    "KSEA": [ "lat": "47.448889", "lon": "-122.309444" ],
-                    "KJFK": [ "lat": "40.639722", "lon": "-73.778889" ]
+                    "KMSY": [ "lat": 29.993333, "lon": -90.258056 ],
+                    "KSFO": [ "lat": 37.618889, "lon": -122.375000 ],
+                    "KSEA": [ "lat": 47.448889, "lon": -122.309444 ],
+                    "KJFK": [ "lat": 40.639722, "lon": -73.778889 ]
                 ]
             )
         }

Pod/Core/DataTable.swift

@@ -7,6 +7,20 @@
 
 import Foundation
 
+/**
+ Use DataTable as the type of the step parameter to be able to pass collection of values to the step.
+
+ Example:
+ ```
+ Given("I use the following names:") {
+    ["Alice", "Bob"]
+ }
+
+ step("I use the following names: (.+)") { (match: DataTable<[String]>) in
+    ...
+ }
+ ```
+ */
 public struct DataTable<T: Collection>: CodableMatchedStringRepresentable where T: Codable {
     public let values: T
 

Pod/Native/NativeDataTable.swift

@@ -60,13 +60,19 @@ extension StepDefiner {
 extension StepDefiner {
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | 1 |
      | 2 |
      | 3 |
-
-     Result:
+     ```
+
+     Values passed to the step:
+     ```
      [1, 2, 3]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[T]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [T] in
@@ -84,13 +90,19 @@ extension StepDefiner {
     }
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | 1 | 4 |
      | 2 | 5 |
      | 3 | 6 |
+     ```
 
-     Result:
+     Values passed to the step:
+     ```
      [[1, 4], [2, 5], [3, 6]]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[[T]]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [[T]] in
@@ -106,18 +118,24 @@ extension StepDefiner {
     }
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | firstName   | lastName | birthDate  |
      | Annie M. G. | Schmidt  | 1911-03-20 |
      | Roald       | Dahl     | 1916-09-13 |
      | Astrid      | Lindgren | 1907-11-14 |
+     ```
 
-     Result:
+     Values passed to the step:
+     ```
      [
          [ "firstName": "Annie M.G", "lastName": "Schmidt",  "birthDate": "1911-03-20" ],
          [ "firstName": "Roald",     "lastName": "Dahl",     "birthDate": "1916-09-13" ],
          [ "firstName": "Astrid",    "lastName": "Lindgren", "birthDate": "1907-11-14" ]
      ]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[[String: T]]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [[String: T]] in
@@ -137,19 +155,25 @@ extension StepDefiner {
     }
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | KMSY | Louis Armstrong New Orleans International Airport |
      | KSFO | San Francisco International Airport               |
      | KSEA | Seattle–Tacoma International Airport              |
      | KJFK | John F. Kennedy International Airport             |
+     ```
 
-     Result:
+     Values passed to the step:
+     ```
      [
          "KMSY": "Louis Armstrong New Orleans International Airport",
          "KSFO": "San Francisco International Airport",
          "KSEA": "Seattle–Tacoma International Airport",
          "KJFK": "John F. Kennedy International Airport"
      ]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[String: T]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [String: T] in
@@ -167,19 +191,25 @@ extension StepDefiner {
     }
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | KMSY | 29.993333 |  -90.258056 |
      | KSFO | 37.618889 | -122.375000 |
      | KSEA | 47.448889 | -122.309444 |
      | KJFK | 40.639722 |  -73.778889 |
+     ```
 
-     Result:
+     Values passed to the step:
+     ```
      [
-         "KMSY": ["29.993333", "-90.258056"],
-         "KSFO": ["37.618889", "-122.375000"],
-         "KSEA": ["47.448889", "-122.309444"],
-         "KJFK": ["40.639722", "-73.778889"]
+         "KMSY": [29.993333, -90.258056],
+         "KSFO": [37.618889, -122.375000],
+         "KSEA": [47.448889, -122.309444],
+         "KJFK": [40.639722, -73.778889]
      ]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[String: [T]]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [String: [T]] in
@@ -195,20 +225,26 @@ extension StepDefiner {
     }
 
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      |      |       lat |         lon |
      | KMSY | 29.993333 |  -90.258056 |
      | KSFO | 37.618889 | -122.375000 |
      | KSEA | 47.448889 | -122.309444 |
      | KJFK | 40.639722 |  -73.778889 |
+     ```
 
-     Result:
+     Values passed to the step:
+     ```
      [
-         "KMSY": [ "lat": "29.993333", "lon": "-90.258056" ],
-         "KSFO": [ "lat": "37.618889", "lon": "-122.375000" ],
-         "KSEA": [ "lat": "47.448889", "lon": "-122.309444" ],
-         "KJFK": [ "lat": "40.639722", "lon": "-73.778889" ]
+         "KMSY": [ "lat": 29.993333, "lon": -90.258056 ],
+         "KSFO": [ "lat": 37.618889, "lon": -122.375000 ],
+         "KSEA": [ "lat": 47.448889, "lon": -122.309444 ],
+         "KJFK": [ "lat": 40.639722, "lon": -73.778889 ]
      ]
+     ```
      */
     open func step<T: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[String: [String: T]]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [String: [String: T]] in
@@ -227,18 +263,25 @@ extension StepDefiner {
     }
 
     // TODO: implement custom decoder that will decode string cell values to expected types instead of failing
-    // This currently only works if all properties are strings
     /**
-     Input:
+     Step that parses data table
+
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      | name  | age | height |
      | Alice | 20  | 170    |
      | Bob   | 21  | 171    |
-
-     Output:
+     ```
+
+     Values passed to the step:
+     ```
      [
-         Person(name: "Alice", age: 20, height: 170),
-         Person(name: "Bob", age: 21, height: 171)
+         Person(name: "Alice", age: "20", height: 170),
+         Person(name: "Bob", age: "21", height: 171)
      ]
+     ```
     */
     open func step<T: CodableMatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[T]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [T] in
@@ -257,18 +300,23 @@ extension StepDefiner {
     }
 
     // TODO: implement custom decoder that will decode string cell values to expected types instead of failing
-    // This currently only works if all properties are strings
     /**
-     Input:
+     Define the step that accepts a data table as a single parameter.
+
+     Input from the feature file:
+     ```
      |   | name  | age | height |
      | 1 | Alice | 20  | 170    |
      | 2 | Bob   | 21  | 171    |
+     ```
 
-     Output:
+     Values passed to the step:
+     ```
      [
          1: Person(name: "Alice", age: 20, height: 170),
          2: Person(name: "Bob", age: 21, height: 171)
      ]
+     ```
     */
     open func step<T: CodableMatchedStringRepresentable, U: MatchedStringRepresentable>(_ expression: String, file: String = #file, line: Int = #line, f1: @escaping (NativeDataTable<[U: T]>)->()) {
         self.step(expression, file: file, line: line, f1: f1) { (values: [[String]]) throws -> [U: T] in

README.md

@@ -350,6 +350,7 @@ There is an example of this in the Example/ project as part of this pod. Look at
 
 The advantages of this are obvious; you get to quickly run your existing feature files and can get up and running quickly. The disadvanages are beacuse the tests are generated at runtime they can't be run individually from inside Xcode so debugging is tricker. I would use this to start testing inside Xcode but if it gets hairy, convert that feature file into a native Swift test and debug from there.
 
+Note: when working with native feature files with data tables steps should use `NativeDataTable` type instead of `DataTable`. See [native_data_table.feature](Example/Tests/Features/NativeFeatures/native_data_table.feature) for examples of data table formats that you can use in the feature files.
 
 ### Localisation of feature files