New/modify save step (#11)

* added capability of memory extraction for I save "" to memory as "" step

Author: eugs

src/index.ts

@@ -87,10 +87,15 @@ When(
 
 /**
  * Save value to memory
- * @param {string} value
- * @param {string} key
+ * @param {string} alias - value to save or alias for previously saved value
+ * @param {string} key - key to store value
  * @example I save 'value' to memory as 'key'
+ * @example I save '$getRandomUser()' to memory as 'user'
  */
-When('I save {string} to memory as {string}', function (value: string, key: string) {
-    memory.setValue(key, value);
-});
+When(
+   'I save {string} to memory as {string}',
+    async function (alias: string, key: string) {
+      const value: string = await memory.getValue(alias);
+      memory.setValue(key, value);
+    }
+);

test-e2e/features/memory.feature

@@ -3,3 +3,11 @@ Feature: Memory
   Scenario: math expression
     When I save result of math expression '32 + 1' as 'result'
     Then I expect '$result' to be equal '33'
+
+  Scenario: save result of sync computed to memory
+    When I save "$getString()" to memory as 'string1'
+    Then I expect '$string1' to be equal 'I was computed'
+
+	Scenario: save result of async computed to memory
+    When I save "$getStringAsync()" to memory as 'string1'
+    Then I expect '$string1' to be equal 'I was computed async'

test-e2e/memory/index.ts

@@ -1,2 +1,13 @@
 export default class Memory {
+  getString = function(): string {
+    return 'I was computed';
+  };
+
+  getStringAsync = function(): Promise<string> {
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        resolve('I was computed async');
+    }, 50);
+  });
+  }
 }