[Fix_#856] Add debug task

Signed-off-by: Francisco Javier Tirado Sarti <[email protected]>

ctk/features/debug.feature

@@ -0,0 +1,42 @@
+Feature: Debug Task
+  As an implementer of the workflow DSL
+  I want to ensure that debug tasks can be executed within the workflow
+  So that my implementation conforms to the expected behaviour
+
+  # Tests Debug with literal constant
+  Scenario: Debug with literal constant
+    Given a workflow with definition:
+    """yaml
+    document:
+      dsl: 1.0.0-alpha1
+      namespace: default
+      name: debug
+    do:
+      printMessage:
+        debug: Hello world!
+    """
+    And given the workflow input is:
+    """yaml
+    """
+    When the workflow is executed
+    Then the workflow should complete
+
+  # Tests Debug with expression
+  Scenario: Debug with expression
+    Given a workflow with definition:
+    """yaml
+    document:
+      dsl: 1.0.0-alpha1
+      namespace: default
+      name: debug
+    do:
+      printMessage:
+        debug: ${Hello \(.name)!} 
+    """
+    And given the workflow input is:
+    """yaml
+      name: John
+    """
+    When the workflow is executed
+    Then the workflow should complete
+

dsl-reference.md

@@ -28,6 +28,7 @@
     - [Set](#set)
     - [Try](#try)
     - [Wait](#wait)
+    - [Debug](#debug)
   + [Flow Directive](#flow-directive)
   + [External Resource](#external-resource)
   + [Authentication](#authentication)
@@ -973,6 +974,22 @@ do:
       seconds: 10
 ```
 
+#### Debug
+
+Allows workflows to print information to standart output. It accepts a string that can be a literal or an expr
+
+##### Examples
+```yaml
+document:
+  dsl: '1.0.0-alpha1'
+  namespace: test
+  name: sample-workflow
+  version: '0.1.0'
+do:
+  printMessage:
+    debug: Hello world!
+```
+
 ### Flow Directive
 
 Flow Directives are commands within a workflow that dictate its progression.

dsl.md

@@ -111,8 +111,9 @@ The Serverless Workflow DSL defines several default [task](dsl-reference.md#task
 - [Set](dsl-reference.md#set), used to dynamically set or update the [workflow](dsl-reference.md#workflow)'s data during the its execution. 
 - [Try](dsl-reference.md#try), used to attempt executing a specified [task](dsl-reference.md#task), and to handle any resulting [errors](dsl-reference.md#error) gracefully, allowing the [workflow](dsl-reference.md#workflow) to continue without interruption.
 - [Wait](dsl-reference.md#wait), used to pause or wait for a specified duration before proceeding to the next task.
+- [Debug] (dsl-reference.md#debug), used to print information to standard output
 
-To ensure they conform to the DSL, runtimes **should** pass all the feature conformance test scenarii defined in the [ctk](ctk/README.md).
+To ensure they conform to the DSL, runtimes **should** pass all the feature conformance test scenario defined in the [ctk](ctk/README.md).
 
 ##### Secret
 

schema/workflow.yaml

@@ -127,6 +127,7 @@ $defs:
       - $ref: '#/$defs/switchTask'
       - $ref: '#/$defs/tryTask'
       - $ref: '#/$defs/waitTask'
+      - $ref: '#/$defs/debugTask'
   callTask:
     type: object
     oneOf:
@@ -533,6 +534,12 @@ $defs:
         description: The amount of time to wait.
     required: [ wait ]
     description: Allows workflows to pause or delay their execution for a specified period of time.
+  debugTask:
+     type: object
+     properties: 
+       debug: 
+         type: string
+     description: Print a message (a literal string or an expression) to standard output
   authenticationPolicy:
     type: object
     oneOf: