moving the Maven coordinates up #7
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ajalt
referenced
this pull request
in ajalt/kotlintest
Jul 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> pass
Shrink #2: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7 fail
Shrink #3: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ fail
Shrink #4: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) fail
Shrink #5: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQx fail
Shrink #6: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k fail
Shrink #7: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x, fail
Shrink #8: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B* fail
Shrink #9: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn fail
Shrink #10: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2 fail
Shrink #11: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M# fail
Shrink #12: DPn CPQ7hBAY&LP;7MxPtN^Oy\$ pass
Shrink #13: DPn CPQ7hBAY&LP;7MxPtN^Oy\$F pass
Shrink #14: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz pass
Shrink #15: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; pass
Shrink #16: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M pass
Shrink #17: aaaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$ pass
Shrink #18: aaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$F pass
Shrink #19: aaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz pass
Shrink #20: aaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; pass
Shrink #21: aDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M pass
Shrink 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}nkx
Shrink #1: <empty string> pass
Shrink #2: t ^j>t\o,x3?eb9 pass
Shrink #3: #F'>g>vGQ-N}nkx fail
Shrink #4: #F'>g>vG fail
Shrink #5: #F'> fail
Shrink #6: #F fail
Shrink #7: # fail
Shrink result => #
```
This is only 7 tries, and produces the correct output of `"#"`
sksamuel
pushed a commit
that referenced
this pull request
Jul 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> pass
Shrink #2: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ tri7 fail
Shrink #3: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) e|Gr+ fail
Shrink #4: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQxU+!) fail
Shrink #5: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k<}QQx fail
Shrink #6: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x,L;6&k fail
Shrink #7: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B*w,1x, fail
Shrink #8: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn18+B* fail
Shrink #9: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2yEcNn fail
Shrink #10: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M#EC\M2 fail
Shrink #11: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M# fail
Shrink #12: DPn CPQ7hBAY&LP;7MxPtN^Oy\$ pass
Shrink #13: DPn CPQ7hBAY&LP;7MxPtN^Oy\$F pass
Shrink #14: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz pass
Shrink #15: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; pass
Shrink #16: DPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M pass
Shrink #17: aaaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$ pass
Shrink #18: aaaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$F pass
Shrink #19: aaaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz pass
Shrink #20: aaDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz; pass
Shrink #21: aDPn CPQ7hBAY&LP;7MxPtN^Oy\$Fz;M pass
Shrink 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}nkx
Shrink #1: <empty string> pass
Shrink #2: t ^j>t\o,x3?eb9 pass
Shrink #3: #F'>g>vGQ-N}nkx fail
Shrink #4: #F'>g>vG fail
Shrink #5: #F'> fail
Shrink #6: #F fail
Shrink #7: # fail
Shrink result => #
```
This is only 7 tries, and produces the correct output of `"#"`
sksamuel
added a commit
that referenced
this pull request
Nov 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.