Development

How do you test a backend API?

I was applying for QA position and the SDET asked me this question:

How do you test a backend API?

In the interview.

I wasn’t sure I answered it correctly. Just wondering if I can get some input from someone.

How to validate if .txt file format is correct as a part of File processing in Automation framework?

In my Selenium+Java automation framework, I need to open a .txt file or any other extension file and then see if the text is in a particular format. Now, I need to see if all lines are in this format and also, say in line 2, from substring (7,10) is 2000. Now, is there any method in FileUtils API?
I can open the file and assert that it exists. I am not able to validate File content. I need to do this as a part of my Automation project. this is indeed the purpose of my project to validate all file format contents.
Like:
0000000TEst 123 234 TEST22 refreence 0002343
00000002000 2343 23343 TEST22000000000000000000
000000003534 3434 34343 3434 343 343 TEst 0000000 000 000 001

Update in response to answers:
Thanks! this is very helpful, i will use this method to verify all the file formats with regex.
Also, once i validate the format, then i will validate some substrings. Now, i have the expected result of Substring stored in String line2Value = “2000”;
if(line1.substring(7,10).equals(line2Value)){

// syso(“This is correct…..”
}

Now, I have such kind of a file in which some section of records, some regex repeats n number of times.
{1:TES001}{2:TEST002}{3:
:03:192sscE8wre
:04:TESTLIne
:05C:23434/23423
:06:/
:07:343434,434343//3434343434
:89:?This is test line / EXTRA TEXT LINE
-}
My file will have hundreds of these sections, that all start from {1:… and end with -89 }..

how i can check not just 1 section, but all of these groups are in the same format :/

Development

Unable to launch a website in firefox browser using firefox Driver config

I am Unable to launch a website in firefox browser using firefox Driver config.
Jmeter version : 5.5
Firefox version installed on system : 110.0
. Below are the jmeter logs,
2023-02-16 14:55:35,984 ERROR o.a.j.t.JMeterThread: Error calling threadStarted
org.openqa.selenium.SessionNotCreatedException: Could not start a new session. Response code 500. Message: Expected browser binary location, but unable to find binary in default location, no ‘moz:firefoxOptions.binary’ capability provided, and no binary flag set on the command line
Host info: host: ‘KESHAVSS298-UB’, ip: ‘192.168.2.21’
Build info: version: ‘4.7.2’, revision: ‘4d4020c3b7’
System info: os.name: ‘Windows 10’, os.arch: ‘amd64’, os.version: ‘10.0’, java.version: ‘1.8.0_241’
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Command: [null, newSession {capabilities=[Capabilities {acceptInsecureCerts: false, browserName: firefox, moz:debuggerAddress: true, moz:firefoxOptions: {args: [], profile: UEsDBBQACAgIAPF2UFYAAAAAAAA…}, proxy: Proxy(system)}], desiredCapabilities=Capabilities {acceptInsecureCerts: false, browserName: firefox, moz:debuggerAddress: true, moz:firefoxOptions: {args: [], profile: UEsDBBQACAgIAPF2UFYAAAAAAAA…}, proxy: Proxy(system)}}]
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:148) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:106) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:67) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:156) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.service.DriverCommandExecutor.invokeExecute(DriverCommandExecutor.java:167) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:142) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:535) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:228) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:156) ~[selenium-remote-driver-4.7.2.jar:?]
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:130) ~[selenium-firefox-driver-4.7.2.jar:?]
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:126) ~[selenium-firefox-driver-4.7.2.jar:?]
at com.googlecode.jmeter.plugins.webdriver.config.FirefoxDriverConfig.createBrowser(FirefoxDriverConfig.java:36) ~[jmeter-plugins-webdriver-4.7.2.jar:?]
at com.googlecode.jmeter.plugins.webdriver.config.FirefoxDriverConfig.createBrowser(FirefoxDriverConfig.java:15) ~[jmeter-plugins-webdriver-4.7.2.jar:?]
at com.googlecode.jmeter.plugins.webdriver.config.WebDriverConfig.getPreparedBrowser(WebDriverConfig.java:215) ~[jmeter-plugins-webdriver-4.7.2.jar:?]
at com.googlecode.jmeter.plugins.webdriver.config.WebDriverConfig.threadStarted(WebDriverConfig.java:146) ~[jmeter-plugins-webdriver-4.7.2.jar:?]
at org.apache.jmeter.threads.JMeterThread$ThreadListenerTraverser.addNode(JMeterThread.java:797) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:993) ~[jorphan.jar:5.5]
at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:976) ~[jorphan.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.threadStarted(JMeterThread.java:765) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.initRun(JMeterThread.java:753) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:264) ~[ApacheJMeter_core.jar:5.5]
at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_241]
2023-02-16 14:55:35,984 ERROR o.a.j.t.JMeterThread: Error while processing sampler: ‘jp@gc – WebDriver Sampler1’.
java.lang.IllegalArgumentException: Browser has not been configured. Please ensure at least 1 WebDriverConfig is created for a ThreadGroup.
at com.googlecode.jmeter.plugins.webdriver.sampler.WebDriverSampler.sample(WebDriverSampler.java:63) ~[jmeter-plugins-webdriver-4.7.2.jar:?]
at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:651) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:570) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) ~[ApacheJMeter_core.jar:5.5]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) ~[ApacheJMeter_core.jar:5.5]
at java.lang.Thread.run(Unknown Source) ~[?:1.8.0_241]
2023-02-16 14:55:35,984 INFO o.a.j.t.JMeterThread: Thread is done: Thread Group 1-1

Also I have tried solutions from below link but no luck.
https://sqa.stackexchange.com/questions/44197/unable-to-launch-and-set-the-geckodriver-using-firefox-driver-config?newreg=a459140114d04c5da24c0e78d35c11a6

Please help.

Capacity Testing: What is it, Why it is Important, Real-Life Examples of Capacity Tests

Capacity testing is a type of performance testing used to determine how much workload a system can handle before its performance begins to degrade. This testing is crucial for understanding the limits of your application’s capacity and ensuring it can handle high levels of traffic or data. Knowing the capacity of a system helps in…
The post Capacity Testing: What is it, Why it is Important, Real-Life Examples of Capacity Tests appeared first on Software Testing Material.