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moving the Maven coordinates up#7
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I think this information is very important and searched frequently, so it should be near the top of the page.
ajalt referenced this pull request in ajalt/kotlintestJul 13, 2018
The current string shrink algorithm generates candidates by dropping single characters from the end of the input. This doesn't produce the smallest case, since it doesn't drop characters from the start of the string. It is also linear on the size of the input, so it requires a potentially large number of tries to reach the result it does produce.This PR changes to algorithm to bisect the input string from both directions, producing a minimal output in log n tries.As an example of the current behavior, the test:`forAll { it: String -> !it.contains("#") }`produces output like this:```Attempting to shrink failed arg DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7jw{Shrink#1: <empty string> passShrink#2: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7 failShrink#3: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ failShrink#4: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) failShrink#5: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQx failShrink#6: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k failShrink#7: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x, failShrink#8: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B* failShrink#9: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn failShrink#10: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2 failShrink#11: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M# failShrink#12: DPn CPQ7hBAY&LP;7MxPtN^Oy\$ passShrink#13: DPn CPQ7hBAY&LP;7MxPtN^Oy\$F passShrink#14: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz passShrink#15: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; passShrink#16: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M passShrink#17: aaaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$ passShrink#18: aaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$F passShrink#19: aaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz passShrink#20: aaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; passShrink#21: aDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M passShrink result => DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#```This is 21 attempts to produce a string 32x longer than optimal.The new algorithm produces output like this:```Attempting to shrink failed arg t ^j>t\o,x3?eb9#F'>g>vGQ-N}nkxShrink#1: <empty string> passShrink#2: t ^j>t\o,x3?eb9 passShrink#3: #F'>g>vGQ-N}nkx failShrink#4: #F'>g>vG failShrink#5: #F'> failShrink#6: #F failShrink#7: # failShrink result => #```This is only 7 tries, and produces the correct output of `"#"`sksamuel pushed a commit that referenced this pull requestJul 15, 2018
The current string shrink algorithm generates candidates by dropping single characters from the end of the input. This doesn't produce the smallest case, since it doesn't drop characters from the start of the string. It is also linear on the size of the input, so it requires a potentially large number of tries to reach the result it does produce.This PR changes to algorithm to bisect the input string from both directions, producing a minimal output in log n tries.As an example of the current behavior, the test:`forAll { it: String -> !it.contains("#") }`produces output like this:```Attempting to shrink failed arg DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7jw{Shrink#1: <empty string> passShrink#2: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7 failShrink#3: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ failShrink#4: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) failShrink#5: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQx failShrink#6: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k failShrink#7: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x, failShrink#8: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B* failShrink#9: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn failShrink#10: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2 failShrink#11: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M# failShrink#12: DPn CPQ7hBAY&LP;7MxPtN^Oy\$ passShrink#13: DPn CPQ7hBAY&LP;7MxPtN^Oy\$F passShrink#14: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz passShrink#15: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; passShrink#16: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M passShrink#17: aaaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$ passShrink#18: aaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$F passShrink#19: aaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz passShrink#20: aaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; passShrink#21: aDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M passShrink result => DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#```This is 21 attempts to produce a string 32x longer than optimal.The new algorithm produces output like this:```Attempting to shrink failed arg t ^j>t\o,x3?eb9#F'>g>vGQ-N}nkxShrink#1: <empty string> passShrink#2: t ^j>t\o,x3?eb9 passShrink#3: #F'>g>vGQ-N}nkx failShrink#4: #F'>g>vG failShrink#5: #F'> failShrink#6: #F failShrink#7: # failShrink result => #```This is only 7 tries, and produces the correct output of `"#"`sksamuel added a commit that referenced this pull requestNov 18, 2023
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I think this information is very important and searched frequently, so it should be near the top of the page.