Extend support for Postman random functions/dynamic variables/replaceIn

.eslintignore

@@ -0,0 +1,2 @@
+# Ignore linting for
+lib/shim/faker.js

.prettierignore

@@ -0,0 +1,2 @@
+# Ignore prettier for
+lib/shim/faker.js

example/v2/replaceIn.json

@@ -0,0 +1,88 @@
+{
+	"info": {
+		"_postman_id": "00ff76ea-1b0e-4ad7-910a-3eb13a7bfa8e",
+		"name": "replaceIn",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+	},
+	"item": [
+		{
+			"name": "Post with collectionVariable set with replaceIn",
+			"event": [
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"pm.collectionVariables.set(\"email\", pm.variables.replaceIn(\"{{$randomEmail}}\"));",
+							"pm.collectionVariables.set(\"name\", pm.variables.replaceIn(\"{{$randomFirstName}}\"));",
+							"pm.collectionVariables.set(\"phone_number\", pm.variables.replaceIn(\"{{$randomPhoneNumber}}\"));",
+							"pm.collectionVariables.set(\"id\", pm.variables.replaceIn(\"{{$guid}}\"));"
+						],
+						"type": "text/javascript"
+					}
+				},
+				{
+					"listen": "test",
+					"script": {
+						"exec": [
+							"pm.test(\"Status code is 200\", function () {",
+							"    pm.response.to.have.status(200);",
+							"});",
+							"",
+							"const resp = pm.response.json();",
+							"",
+							"pm.test(\"Check response consistency\", function () {",
+							"    pm.expect(resp.json.email).to.be.equal(pm.collectionVariables.get(\"email\"));",
+							"    pm.expect(resp.json.name).to.be.equal(pm.collectionVariables.get(\"name\"));",
+							"    pm.expect(resp.json.phone_number).to.be.equal(pm.collectionVariables.get(\"phone_number\"));",
+							"});"
+						],
+						"type": "text/javascript"
+					}
+				}
+			],
+			"request": {
+				"method": "POST",
+				"header": [
+					{
+						"key": "Content-Type",
+						"value": "application/json",
+						"type": "text"
+					}
+				],
+				"body": {
+					"mode": "raw",
+					"raw": "{\n    \"email\": \"{{email}}\",\n    \"name\": \"{{name}}\",\n    \"phone_number\": \"{{phone_number}}\",\n    \"id\" : \"{{id}}\"\n}"
+				},
+				"url": {
+					"raw": "httpbin.org/post",
+					"host": [
+						"httpbin",
+						"org"
+					],
+					"path": [
+						"post"
+					]
+				}
+			},
+			"response": []
+		}
+	],
+	"variable": [
+		{
+			"key": "email",
+			"value": ""
+		},
+		{
+			"key": "name",
+			"value": ""
+		},
+		{
+			"key": "phone_number",
+			"value": ""
+		},
+		{
+			"key": "id",
+			"value": ""
+		}
+	]
+}

lib/shim/core.js

@@ -1,6 +1,9 @@
 import k6 from 'k6';
 import http from 'k6/http';
 
+/* Load dynamic variables */
+import { dynamicGenerators, dynamicGeneratorsRegex } from './dynamic.js';
+
 /* Constants */
 const undef = void 0; /* eslint-disable-line no-void */
 
@@ -161,20 +164,20 @@ const dynamic = {
   guid() {
     return guid();
   },
-
   /* Random integer [0,1000] */
   randomInt() {
     return Math.floor(Math.random() * 1001);
   },
-
   /* Current time as Unix timestamp */
   timestamp() {
     return Date.now();
   },
 };
+
 function computeDynamic(name) {
-  if (dynamic[name]) {
-    return dynamic[name]();
+  const functionName = '$' + name;
+  if (dynamicGenerators[functionName]) {
+    return dynamicGenerators[functionName].generator();
   } else {
     throw new Error(`Unsupported dynamic variable: ${name}`);
   }
@@ -537,6 +540,13 @@ const pm = Object.freeze({
       requireRequest();
       scope.local = scope.local[Write](name, value);
     },
+    replaceIn(template) {
+      return template.replace(dynamicGeneratorsRegex, function(match) {
+        // We remove the enclosing {{ }} to extract the generator type like "$randomName"
+        const generatorType = match.slice(2, -2);
+        return dynamicGenerators[generatorType].generator();
+      });
+    },
   }),
 
   collectionVariables: Object.freeze({