feat: Update test harness (add assertions) #1467

Signed-off-by: christian.lutnik <[email protected]>

specification/assets/gherkin/metadata.feature

@@ -0,0 +1,25 @@
+@Metadata
+Feature: Metadata
+
+  Background:
+    Given a provider is registered
+
+  Scenario: Returns metadata
+    Given a Boolean-flag with key "metadata-flag" and a default value "true"
+    When the flag was evaluated with details
+    Then the resolved metadata value "string" with type "String" should be "1.0.2"
+    And the resolved metadata value "integer" with type "Integer" should be "2"
+    And the resolved metadata value "double" with type "Double" should be "0.1"
+    And the resolved metadata value "boolean" with type "Boolean" should be "true"
+
+  Scenario Outline: Returns no metadata
+    Given a <type>-flag with key "<key>" and a default value "<default_value>"
+    When the flag was evaluated with details
+    Then the resolved metadata is empty
+
+    Examples: Flags
+      | key          | type    | default_value |
+      | boolean-flag | Boolean | true          |
+      | integer-flag | Integer | 23            |
+      | float-flag   | Float   | 2.3           |
+      | string-flag  | String  | value         |