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testscript: add test to show cmp with small diff between large files #129

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Mar 1, 2021
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testscript: add test to show cmp with small diff between large files #129

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167 changes: 167 additions & 0 deletions testscript/testdata/long_diff.txt
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@@ -0,0 +1,167 @@
# Verify the behaviour of cmp in the case of a small diff between
# two large files

unquote dir/script.txt
! testscript dir
env
cmpenv stdout stdout.golden

-- dir/script.txt --
>cmp a b
>
>-- a --
>a
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>-- b --
>b
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-- stdout.golden --

> cmp a b
[diff -a +b]
-a
+b
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FAIL: $$WORK${/}dir${/}script.txt:1: a and b differ
1 change: 1 addition & 0 deletions testscript/testscript.go
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Original file line number Diff line number Diff line change
Expand Up @@ -299,6 +299,7 @@ func (ts *TestScript) setup() string {
"devnull=" + os.DevNull,
"/=" + string(os.PathSeparator),
":=" + string(os.PathListSeparator),
"$=$",

// If we are collecting coverage profiles for merging into the main one,
// ensure the environment variable is forwarded to sub-processes.
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