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-rwxr-xr-xt/t4024-diff-optimize-common.sh158
1 files changed, 158 insertions, 0 deletions
diff --git a/t/t4024-diff-optimize-common.sh b/t/t4024-diff-optimize-common.sh
new file mode 100755
index 0000000..e2f0eca
--- /dev/null
+++ b/t/t4024-diff-optimize-common.sh
@@ -0,0 +1,158 @@
+#!/bin/sh
+
+test_description='common tail optimization'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+z=zzzzzzzz ;# 8
+z="$z$z$z$z$z$z$z$z" ;# 64
+z="$z$z$z$z$z$z$z$z" ;# 512
+z="$z$z$z$z" ;# 2048
+z2047=$(expr "$z" : '.\(.*\)') ; #2047
+
+x=zzzzzzzzzz ;# 10
+y="$x$x$x$x$x$x$x$x$x$x" ;# 100
+z="$y$y$y$y$y$y$y$y$y$y" ;# 1000
+z1000=$z
+z100=$y
+z10=$x
+
+zs() {
+ count="$1"
+ while test "$count" -ge 1000
+ do
+ count=$(($count - 1000))
+ printf "%s" $z1000
+ done
+ while test "$count" -ge 100
+ do
+ count=$(($count - 100))
+ printf "%s" $z100
+ done
+ while test "$count" -ge 10
+ do
+ count=$(($count - 10))
+ printf "%s" $z10
+ done
+ while test "$count" -ge 1
+ do
+ count=$(($count - 1))
+ printf "z"
+ done
+}
+
+zc () {
+ sed -e "/^index/d" \
+ -e "s/$z1000/Q/g" \
+ -e "s/QQQQQQQQQ/Z9000/g" \
+ -e "s/QQQQQQQQ/Z8000/g" \
+ -e "s/QQQQQQQ/Z7000/g" \
+ -e "s/QQQQQQ/Z6000/g" \
+ -e "s/QQQQQ/Z5000/g" \
+ -e "s/QQQQ/Z4000/g" \
+ -e "s/QQQ/Z3000/g" \
+ -e "s/QQ/Z2000/g" \
+ -e "s/Q/Z1000/g" \
+ -e "s/$z100/Q/g" \
+ -e "s/QQQQQQQQQ/Z900/g" \
+ -e "s/QQQQQQQQ/Z800/g" \
+ -e "s/QQQQQQQ/Z700/g" \
+ -e "s/QQQQQQ/Z600/g" \
+ -e "s/QQQQQ/Z500/g" \
+ -e "s/QQQQ/Z400/g" \
+ -e "s/QQQ/Z300/g" \
+ -e "s/QQ/Z200/g" \
+ -e "s/Q/Z100/g" \
+ -e "s/000Z//g" \
+ -e "s/$z10/Q/g" \
+ -e "s/QQQQQQQQQ/Z90/g" \
+ -e "s/QQQQQQQQ/Z80/g" \
+ -e "s/QQQQQQQ/Z70/g" \
+ -e "s/QQQQQQ/Z60/g" \
+ -e "s/QQQQQ/Z50/g" \
+ -e "s/QQQQ/Z40/g" \
+ -e "s/QQQ/Z30/g" \
+ -e "s/QQ/Z20/g" \
+ -e "s/Q/Z10/g" \
+ -e "s/00Z//g" \
+ -e "s/z/Q/g" \
+ -e "s/QQQQQQQQQ/Z9/g" \
+ -e "s/QQQQQQQQ/Z8/g" \
+ -e "s/QQQQQQQ/Z7/g" \
+ -e "s/QQQQQQ/Z6/g" \
+ -e "s/QQQQQ/Z5/g" \
+ -e "s/QQQQ/Z4/g" \
+ -e "s/QQQ/Z3/g" \
+ -e "s/QQ/Z2/g" \
+ -e "s/Q/Z1/g" \
+ -e "s/0Z//g" \
+ ;
+}
+
+expect_pattern () {
+ cnt="$1"
+ cat <<EOF
+diff --git a/file-a$cnt b/file-a$cnt
+--- a/file-a$cnt
++++ b/file-a$cnt
+@@ -1 +1 @@
+-Z${cnt}a
++Z${cnt}A
+diff --git a/file-b$cnt b/file-b$cnt
+--- a/file-b$cnt
++++ b/file-b$cnt
+@@ -1 +1 @@
+-b
++B
+diff --git a/file-c$cnt b/file-c$cnt
+--- a/file-c$cnt
++++ b/file-c$cnt
+@@ -1 +1 @@
+-cZ$cnt
+\ No newline at end of file
++CZ$cnt
+\ No newline at end of file
+diff --git a/file-d$cnt b/file-d$cnt
+--- a/file-d$cnt
++++ b/file-d$cnt
+@@ -1 +1 @@
+-d
++D
+EOF
+}
+
+sample='1023 1024 1025 2047 4095'
+
+test_expect_success setup '
+
+ for n in $sample
+ do
+ ( zs $n && echo a ) >file-a$n &&
+ ( echo b && zs $n && echo ) >file-b$n &&
+ ( printf c && zs $n ) >file-c$n &&
+ ( echo d && zs $n ) >file-d$n &&
+
+ git add file-a$n file-b$n file-c$n file-d$n &&
+
+ ( zs $n && echo A ) >file-a$n &&
+ ( echo B && zs $n && echo ) >file-b$n &&
+ ( printf C && zs $n ) >file-c$n &&
+ ( echo D && zs $n ) >file-d$n &&
+
+ expect_pattern $n || return 1
+
+ done >expect
+'
+
+test_expect_success 'diff -U0' '
+
+ for n in $sample
+ do
+ git diff -U0 file-?$n || return 1
+ done | zc >actual &&
+ test_cmp expect actual
+
+'
+
+test_done