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-rwxr-xr-xt/t4055-diff-context.sh92
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diff --git a/t/t4055-diff-context.sh b/t/t4055-diff-context.sh
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+#!/bin/sh
+#
+# Copyright (c) 2012 Mozilla Foundation
+#
+
+test_description='diff.context configuration'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ cat >template <<-\EOF &&
+ firstline
+ b
+ c
+ d
+ e
+ f
+ preline
+ TARGET
+ postline
+ i
+ j
+ k
+ l
+ m
+ n
+ EOF
+ sed "/TARGET/d" >x <template &&
+ git update-index --add x &&
+ git commit -m initial &&
+
+ sed "s/TARGET/ADDED/" >x <template &&
+ git update-index --add x &&
+ git commit -m next &&
+
+ sed "s/TARGET/MODIFIED/" >x <template
+'
+
+test_expect_success 'the default number of context lines is 3' '
+ git diff >output &&
+ ! grep "^ d" output &&
+ grep "^ e" output &&
+ grep "^ j" output &&
+ ! grep "^ k" output
+'
+
+test_expect_success 'diff.context honored by "log"' '
+ git log -1 -p >output &&
+ ! grep firstline output &&
+ git config diff.context 8 &&
+ git log -1 -p >output &&
+ grep "^ firstline" output
+'
+
+test_expect_success 'The -U option overrides diff.context' '
+ git config diff.context 8 &&
+ git log -U4 -1 >output &&
+ ! grep "^ firstline" output
+'
+
+test_expect_success 'diff.context honored by "diff"' '
+ git config diff.context 8 &&
+ git diff >output &&
+ grep "^ firstline" output
+'
+
+test_expect_success 'plumbing not affected' '
+ git config diff.context 8 &&
+ git diff-files -p >output &&
+ ! grep "^ firstline" output
+'
+
+test_expect_success 'non-integer config parsing' '
+ git config diff.context no &&
+ test_must_fail git diff 2>output &&
+ test_i18ngrep "bad numeric config value" output
+'
+
+test_expect_success 'negative integer config parsing' '
+ git config diff.context -1 &&
+ test_must_fail git diff 2>output &&
+ test_i18ngrep "bad config variable" output
+'
+
+test_expect_success '-U0 is valid, so is diff.context=0' '
+ git config diff.context 0 &&
+ git diff >output &&
+ grep "^-ADDED" output &&
+ grep "^+MODIFIED" output
+'
+
+test_done