{"id":1393,"date":"2026-03-12T13:53:09","date_gmt":"2026-03-12T13:53:09","guid":{"rendered":"https:\/\/razvanvancea.ro\/blog\/?p=1393"},"modified":"2026-03-12T14:43:18","modified_gmt":"2026-03-12T14:43:18","slug":"understanding-race-conditions-in-test-automation","status":"publish","type":"post","link":"https:\/\/razvanvancea.ro\/blog\/2026\/03\/12\/understanding-race-conditions-in-test-automation\/","title":{"rendered":"Understanding Race Conditions in Test Automation"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div>\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1393\" class=\"elementor elementor-1393\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e09d8a8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e09d8a8\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-09c112c\" data-id=\"09c112c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-45e77dd elementor-widget elementor-widget-text-editor\" data-id=\"45e77dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Lately, I\u2019ve been hearing the term \u201crace condition\u201d more and more often &#8211; during conference talks, team discussions, or testing presentations.<\/p><p>Most of the time, it\u2019s mentioned as if everyone already understands it.\u00a0<br \/><br \/>In this article, we\u2019ll break it down in plain language and look at why race conditions matter for software testers &amp; developers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7c1bf41 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7c1bf41\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-10c18c8\" data-id=\"10c18c8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-93efc3f elementor-widget elementor-widget-heading\" data-id=\"93efc3f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The idea behind a race condition<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7c5eafd elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7c5eafd\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-da8904a\" data-id=\"da8904a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fe38158 elementor-widget elementor-widget-text-editor\" data-id=\"fe38158\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A race condition happens when multiple operations try to access or modify the same resource at the same time, and the final result depends on the timing of those operations.<\/p><p>Think of it like two people racing to complete a task first.<\/p><p>If the outcome changes depending on who finishes first, you have a race condition.<\/p><p>In software, the \u201cracers\u201d are usually:<\/p><ul><li>threads<\/li><li>processes<\/li><li>pervices<\/li><li>API calls<\/li><li>users interacting with the system simultaneously<\/li><\/ul><p>When these actions happen in the wrong order, the system may behave unpredictably.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9d6537b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9d6537b\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-232d50f\" data-id=\"232d50f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3e82492 elementor-widget elementor-widget-heading\" data-id=\"3e82492\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Real-world analogy<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d9822a4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d9822a4\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1d34ae2\" data-id=\"1d34ae2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6dca3d0 elementor-widget elementor-widget-text-editor\" data-id=\"6dca3d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Imagine two coworkers trying to update the same shared spreadsheet.<\/p><ol><li>Both open the file.<\/li><li>Person A changes the value to 10.<\/li><li>Person B changes the value to 15.<\/li><li>Whoever saves last overwrites the other change.<\/li><\/ol><p>The final value depends entirely on who saved last.<\/p><p>The system had no mechanism to coordinate the updates, so the result became unpredictable.<\/p><p>That is essentially a race condition.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e0fbc53 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e0fbc53\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e14c8e3\" data-id=\"e14c8e3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8fd4377 elementor-widget elementor-widget-heading\" data-id=\"8fd4377\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to reduce race conditions in Playwright?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a1135ef elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1135ef\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a3fd70a\" data-id=\"a3fd70a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-db64ebe elementor-widget elementor-widget-text-editor\" data-id=\"db64ebe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A test might work perfectly on a fast local machine but fail intermittently in CI.<\/p><p>When timing changes, the race outcome changes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8fcb1e0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8fcb1e0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-867c526\" data-id=\"867c526\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6b34d6c elementor-widget elementor-widget-text-editor\" data-id=\"6b34d6c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The key idea is simple:<\/p>\n<p>Wait for meaningful conditions, not time.<\/p>\n<p>Avoid fixed delays like this:<\/p>\n<p><em>await page.waitForTimeout(2000);<\/em><\/p>\n<p>Instead, wait for signals that confirm the system is ready.<\/p>\n<p>Wait for UI state<br><em>await expect(page.locator(&#8216;.dashboard&#8217;)).toBeVisible();<br><\/em><br>Wait for network activity<br><em>await page.waitForResponse(resp =&gt;<\/em><br><em>resp.url().includes(&#8216;\/orders&#8217;) &amp;&amp; resp.status() === 200<\/em><em>);<\/em><\/p>\n<p>Wait for stable UI behavior<br><em>await expect(page.getByText(&#8216;Success&#8217;)).toBeVisible();<\/em><\/p>\n<p>These patterns make tests more deterministic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-524ee48 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"524ee48\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b8ae92e\" data-id=\"b8ae92e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-655656d elementor-widget elementor-widget-heading\" data-id=\"655656d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Practical testing mindset<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-32b71f0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"32b71f0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b6f3490\" data-id=\"b6f3490\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-33c5020 elementor-widget elementor-widget-text-editor\" data-id=\"33c5020\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>When writing automation tests, it helps to ask one simple question:<\/p><p><strong>\u201cWhat exactly tells me the system is ready for the next step?\u201d<\/strong><\/p><p>Not:<\/p><p>\u201cHas enough time passed?\u201d<\/p><p>But:<\/p><p>\u201cWhat signal proves the operation is complete?\u201d<\/p><p>The answer might be:<\/p><ul><li>a visible UI element<\/li><li>a completed network request<\/li><li>a database update reflected in the UI<\/li><\/ul><p>Waiting for the right signal removes the race.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b78da1e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b78da1e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-acdd58f\" data-id=\"acdd58f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-97c54db elementor-widget elementor-widget-heading\" data-id=\"97c54db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Final thoughts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-234fdd0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"234fdd0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4ac9513\" data-id=\"4ac9513\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ec23e75 elementor-widget elementor-widget-text-editor\" data-id=\"ec23e75\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Most flaky tests are simply tests that lost the race against the application.<\/p><p>Frameworks like Playwright reduce many timing issues with auto-waiting, but good test design is still essential.<\/p><p>Reliable tests are usually the ones that:<\/p><ul><li>wait for meaningful conditions<\/li><li>avoid arbitrary timeouts<\/li><li>synchronise with the application state<\/li><\/ul><p>In other words, the goal is simple:<\/p><p><strong>Make sure your test and your application are no longer racing each other.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6f83bc9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6f83bc9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5d4b90a\" data-id=\"5d4b90a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-20c55b3 elementor-widget elementor-widget-spacer\" data-id=\"20c55b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9813b2d elementor-widget elementor-widget-text-editor\" data-id=\"9813b2d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Enjoyed this article?<br \/>I share more practical automation tips on\u00a0<a href=\"https:\/\/www.youtube.com\/c\/LearnwithRV\/videos\" target=\"_blank\" rel=\"noopener\"><strong>YouTube<\/strong><\/a>\u00a0and\u00a0<a href=\"https:\/\/www.linkedin.com\/in\/razvanvancea\/\" target=\"_blank\" rel=\"noopener\"><strong>LinkedIn<\/strong><\/a>.<\/p><p><strong>Need structured guidance instead of learning alone?<\/strong><br \/>I offer\u00a0<strong>1-on-1 mentoring<\/strong>\u00a0&#8211; learn more \u2192\u00a0<strong><a href=\"https:\/\/razvanvancea.ro\/1on1.html\" target=\"_blank\" rel=\"noopener\">HERE<\/a><\/strong><\/p><p>Or email me at\u00a0<strong>iamqarv [at] gmail [dot] com<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Lately, I\u2019ve been hearing the term \u201crace condition\u201d more and more often &#8211; during conference&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[10],"tags":[],"class_list":["post-1393","post","type-post","status-publish","format-standard","hentry","category-programming"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Lately, I\u2019ve been hearing the term \u201crace condition\u201d more and more often \u2013 during conference talks, team discussions, or testing presentations.Most of the time, it\u2019s mentioned as if everyone already understands it. In this article, we\u2019ll break it down in plain language and look at why race conditions matter for software testers &amp; developers. 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