In the previous articles on Postman Tutorial, we have covered “How To Generate Advanced HTML Reports, While Using Newman“
In this “How To Fix Common Errors In Postman” article, I will be demonstrating how you can implement this concept and get a tight grip over this.
How To Fix Common Errors In Postman
Common Error in Postman 1:
If we have an environment variable as {{url}. We cannot write inside script as pm.sendRequest({{url}}/item/). The syntax {{url}} works only inside the request builder and not in scripts.
Example:
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var requestUrl = pm.environment.get(("url") + "/item/"); pm.sendRequest(requestUrl, function(err, res){ //Write test here }); |
Common Error in Postman 2:
If we want to trigger another request from a pre-request script, we can do it by using postman.setNextRequest
Example:
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Postman.setNextRequest('request name as saved in Postman'); |
Common Error in Postman 3:
If we want to compare already saved variables (eg. Username) with values from another API response, we can use a method.
Example:
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pm.test ("Your test name", function(){ var jsonData = pm.response.json(); pm.expect(jsonData.value).to.eql(pm.globals.get("username")); }); |
Common Error in Postman 4:
If we have a script like this:
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pm.test("Test Name", function () { var jsonData = pm.response.json(); pm.expect(jsonData.name).to.eql('John'); }); pm.globals.set('name', jsonData.name); |
Sometimes we get the error “ReferenceError: jsonData is not defined” while setting the global variable. To fix this, we need to define jsonData outside the function.
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var jsonData = pm.response.json(); pm.test("Name should be John", function () { pm.expect(jsonData.name).to.eql('John'); }); pm.globals.set('name', jsonData.name); |
Or we can set the environment or global variable inside the function.
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pm.test("Name should be John", function () { var jsonData = pm.response.json(); pm.expect(jsonData.name).to.eql('John'); pm.globals.set('name', jsonData.name); }); |
Common Error in Postman 5:
If we want to set a delay while running a collection in Newman, we can use — delay parameter and specify delay in milliseconds.
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newman run collection.json -- delay 10000 |
Common Error in Postman 6:
If Jenkins shows weird characters in the console, it means output is in Unicode format. To fix this, either use View as Plain text option or add following flags: — disable-unicode
Example:
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newman run collection.json – disable-unicode |
Next steps:
Learn “GUID in Postman” in the next tutorial.
Author Bio: This article is written by Harsha Mittal an ISTQB-CTFL Certified Software Test Engineer having 3.5+ years of experience in Software Testing.
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