https://ask.clojure.org/index.php/qa/contrib-libs/test-check https://ask.clojure.org/index.php/14721/allocation-churn-on-generators <p>When generating moderately large values there is some LazySeq churn that could be avoided. For example, the following snippet allocates over 15GB (measured with async-profiler):</p> <pre><code>(core/let [g (vector (not-empty string-alphanumeric) 1000 5000)] (time (dotimes [seed 50] (dorun (generate g 100 seed))))) </code></pre> <p>The pattern of generating multiple (increasingly larger) values is common with quick-check (via deftest et al).</p> <p>Many generators are built on top of <code>choose</code>, and there is an opportunity to reduce churn by special casing <code>shrink-int</code> for longs (which should be the common case compared to big ints).</p> <p>I have a patch that decreases total allocations of the repro above by ~15% and speed up the run time by ~25% (measured on jdk 25, with <code>-Xmx512m -XX:+UseSerialGC</code> to decrease variance). Happy to share it.</p> test.check https://ask.clojure.org/index.php/14721/allocation-churn-on-generators Tue, 07 Oct 2025 21:16:10 +0000 https://ask.clojure.org/index.php/14040/how-suppress-capture-the-output-defspec-for-use-clojure-test?show=14042#a14042 <p>OK, I found the answer. Just add the following to the top of each unit test file:</p> <p><code>(alter-var-root (var tst/*report-completion*) (constantly false))</code></p> test.check https://ask.clojure.org/index.php/14040/how-suppress-capture-the-output-defspec-for-use-clojure-test?show=14042#a14042 Tue, 06 Aug 2024 21:00:32 +0000 https://ask.clojure.org/index.php/9427/clarify-the-position-of-as-a-keyword?show=9434#a9434 <p>It is undefined/left for future expansion.</p> <p>Clojurescript's reading seems weird but given that this is undefined it's hard to say it's wrong. :) </p> <p>Re test.check, is this an issue for you? I don't personally have any strong feelings about it but if it's making life hard for people, seems reasonable to not gen these.</p> test.check https://ask.clojure.org/index.php/9427/clarify-the-position-of-as-a-keyword?show=9434#a9434 Thu, 09 Jul 2020 13:24:47 +0000 https://ask.clojure.org/index.php/9412/let-rosetree-satisfy-implement-datafiable <p>I think for debugging it would be awesome to be able to navigate through the rose trees.</p> test.check https://ask.clojure.org/index.php/9412/let-rosetree-satisfy-implement-datafiable Thu, 02 Jul 2020 18:36:54 +0000 https://ask.clojure.org/index.php/7616/feature-ability-assign-labels-report-distribution-running?show=8439#a8439 <p>Is anything holding back this patch?</p> test.check https://ask.clojure.org/index.php/7616/feature-ability-assign-labels-report-distribution-running?show=8439#a8439 Thu, 22 Aug 2019 12:07:41 +0000 https://ask.clojure.org/index.php/7640/provide-mechanism-getting-output-from-after-interrupting?show=7810#a7810 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-102" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-102</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7640/provide-mechanism-getting-output-from-after-interrupting?show=7810#a7810 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7628/add-a-bigint-generator?show=7776#a7776 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-148" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-148</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7628/add-a-bigint-generator?show=7776#a7776 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7621/test-check-doesnt-seem-to-have-macro-for-asynchronous-tests?show=7735#a7735 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-128" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-128</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7621/test-check-doesnt-seem-to-have-macro-for-asynchronous-tests?show=7735#a7735 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7622/redesign-gen-choose?show=7739#a7739 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-70" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-70</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7622/redesign-gen-choose?show=7739#a7739 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7623/create-generator-that-will-limit-the-size-generated-sequence?show=7742#a7742 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-99" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-99</a> (reported by m0smith) test.check https://ask.clojure.org/index.php/7623/create-generator-that-will-limit-the-size-generated-sequence?show=7742#a7742 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7624/rerunning-a-particular-failure-is-difficult?show=7764#a7764 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-21" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-21</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7624/rerunning-a-particular-failure-is-difficult?show=7764#a7764 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7625/interactive-documentation?show=7768#a7768 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-123" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-123</a> (reported by viebel) test.check https://ask.clojure.org/index.php/7625/interactive-documentation?show=7768#a7768 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7626/variant-of-gen-any-without-nans?show=7774#a7774 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-147" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-147</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7626/variant-of-gen-any-without-nans?show=7774#a7774 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7627/consider-adding-for-all-2-to-address-a-couple-issues?show=7775#a7775 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-146" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-146</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7627/consider-adding-for-all-2-to-address-a-couple-issues?show=7775#a7775 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7631/run-tests-in-parallel-on-the-jvm?show=7780#a7780 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-115" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-115</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7631/run-tests-in-parallel-on-the-jvm?show=7780#a7780 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7629/re-organize-readme-and-doc?show=7777#a7777 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-14" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-14</a> (reported by reiddraper) test.check https://ask.clojure.org/index.php/7629/re-organize-readme-and-doc?show=7777#a7777 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7630/checking-of-interesting-edge-cases-is-not-very-creative?show=7779#a7779 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-119" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-119</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7630/checking-of-interesting-edge-cases-is-not-very-creative?show=7779#a7779 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7619/support-unicode-chararacters-for-char-based-generators?show=7728#a7728 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-97" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-97</a> (reported by m0smith) test.check https://ask.clojure.org/index.php/7619/support-unicode-chararacters-for-char-based-generators?show=7728#a7728 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7632/size-of-args-is-conflated-with-depth-in-shrink-tree?show=7781#a7781 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-120" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-120</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7632/size-of-args-is-conflated-with-depth-in-shrink-tree?show=7781#a7781 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7633/add-sublist-generator?show=7782#a7782 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-48" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-48</a> (reported by reiddraper) test.check https://ask.clojure.org/index.php/7633/add-sublist-generator?show=7782#a7782 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7634/quick-check-should-accept-an-arg-for-maximum-shrinking-time?show=7784#a7784 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-96" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-96</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7634/quick-check-should-accept-an-arg-for-maximum-shrinking-time?show=7784#a7784 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7635/latest-recursive-algorithm-exhibit-peculiar-variety-depths?show=7785#a7785 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-111" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-111</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7635/latest-recursive-algorithm-exhibit-peculiar-variety-depths?show=7785#a7785 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7636/pos-int-is-confusingly-named?show=7792#a7792 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-2" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-2</a> (reported by hypirion) test.check https://ask.clojure.org/index.php/7636/pos-int-is-confusingly-named?show=7792#a7792 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7639/metadata-for-tuning-on-generated-values?show=7798#a7798 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-153" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-153</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7639/metadata-for-tuning-on-generated-values?show=7798#a7798 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7620/add-performance-regression-checks?show=7734#a7734 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-144" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-144</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7620/add-performance-regression-checks?show=7734#a7734 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7618/variable-collection-generators-exponential-sizing-composed?show=7727#a7727 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-106" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-106</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7618/variable-collection-generators-exponential-sizing-composed?show=7727#a7727 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7637/refactor-quick-check-state-machine-provide-extension-points?show=7795#a7795 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-126" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-126</a> (reported by nberger) test.check https://ask.clojure.org/index.php/7637/refactor-quick-check-state-machine-provide-extension-points?show=7795#a7795 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7607/permit-data-structure-containing-generators-used-generator?show=7677#a7677 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-19" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-19</a> (reported by pangloss) test.check https://ask.clojure.org/index.php/7607/permit-data-structure-containing-generators-used-generator?show=7677#a7677 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7599/exponential-generator?show=7641#a7641 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-71" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-71</a> (reported by eraserhd) test.check https://ask.clojure.org/index.php/7599/exponential-generator?show=7641#a7641 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7600/bind-doesnt-shrink-very-well?show=7644#a7644 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-112" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-112</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7600/bind-doesnt-shrink-very-well?show=7644#a7644 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7601/gen-for-macro-for-alternate-combinator-syntax?show=7645#a7645 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-15" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-15</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7601/gen-for-macro-for-alternate-combinator-syntax?show=7645#a7645 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7602/add-gen-uniform-double?show=7655#a7655 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-84" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-84</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7602/add-gen-uniform-double?show=7655#a7655 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7603/generators-for-functions?show=7656#a7656 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-38" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-38</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7603/generators-for-functions?show=7656#a7656 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7604/add-helpers-for-deprecating-generators?show=7661#a7661 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-41" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-41</a> (reported by johnwalker) test.check https://ask.clojure.org/index.php/7604/add-helpers-for-deprecating-generators?show=7661#a7661 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7605/prop-for-all-should-let-later-bindings-refer-earlier-bindings?show=7662#a7662 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-85" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-85</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7605/prop-for-all-should-let-later-bindings-refer-earlier-bindings?show=7662#a7662 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7617/enable-shrinking-on-recursive-generators?show=7720#a7720 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-110" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-110</a> (reported by halgari) test.check https://ask.clojure.org/index.php/7617/enable-shrinking-on-recursive-generators?show=7720#a7720 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7606/add-nested-property-support?show=7665#a7665 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-7" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-7</a> (reported by hypirion) test.check https://ask.clojure.org/index.php/7606/add-nested-property-support?show=7665#a7665 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7608/string-from-regular-expression-generator?show=7686#a7686 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-60" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-60</a> (reported by steveminer@gmail.com) test.check https://ask.clojure.org/index.php/7608/string-from-regular-expression-generator?show=7686#a7686 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7609/performance-regression-in-map-generator-between-0-5-8-and-0-5?show=7689#a7689 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-57" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-57</a> (reported by brainkim) test.check https://ask.clojure.org/index.php/7609/performance-regression-in-map-generator-between-0-5-8-and-0-5?show=7689#a7689 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7610/bound-tests-and-shrinks-in-time?show=7691#a7691 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-8" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-8</a> (reported by hypirion) test.check https://ask.clojure.org/index.php/7610/bound-tests-and-shrinks-in-time?show=7691#a7691 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7611/handle-sigint?show=7693#a7693 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-4" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-4</a> (reported by hypirion) test.check https://ask.clojure.org/index.php/7611/handle-sigint?show=7693#a7693 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7612/poisson-generator?show=7694#a7694 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-72" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-72</a> (reported by eraserhd) test.check https://ask.clojure.org/index.php/7612/poisson-generator?show=7694#a7694 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7613/for-all-should-support-nesting?show=7696#a7696 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-44" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-44</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7613/for-all-should-support-nesting?show=7696#a7696 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7614/alternate-clojure-test-integration?show=7705#a7705 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-58" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-58</a> (reported by alex+import) test.check https://ask.clojure.org/index.php/7614/alternate-clojure-test-integration?show=7705#a7705 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7615/add-prop-for-alternative-clojure-test-that-uses-clojure-test?show=7707#a7707 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-101" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-101</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7615/add-prop-for-alternative-clojure-test-that-uses-clojure-test?show=7707#a7707 Wed, 26 Jun 2019 12:00:00 +0000 https://ask.clojure.org/index.php/7638/better-distribution-for-the-ratio-generator?show=7797#a7797 Reference: <a href="https://clojure.atlassian.net/browse/TCHECK-149" rel="nofollow" target="_blank">https://clojure.atlassian.net/browse/TCHECK-149</a> (reported by gfredericks) test.check https://ask.clojure.org/index.php/7638/better-distribution-for-the-ratio-generator?show=7797#a7797 Wed, 26 Jun 2019 12:00:00 +0000