Subject: [PATCH 08/15] t4015: abstract away SHA-1-specific constants

From: "brian m. carlson" <[email-masked]>
Date: Sat, 5 Oct 2019 21:12:02 +0000

Adjust the test so that it computes variables for object IDs instead of
using hard-coded hashes.

Signed-off-by: brian m. carlson <[email-masked]>
---
 t/t4015-diff-whitespace.sh | 89 +++++++++++++++++++++++---------------
 1 file changed, 53 insertions(+), 36 deletions(-)

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 6b087df3dc..eadaf57262 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -16,6 +16,7 @@ test_expect_success "Ray Lehtiniemi's example" '
 	} while (0);
 	EOF
 	git update-index --add x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 
 	cat <<-\EOF >x &&
 	do
@@ -24,10 +25,11 @@ test_expect_success "Ray Lehtiniemi's example" '
 	}
 	while (0);
 	EOF
+	after=$(git rev-parse --short $(git hash-object x)) &&
 
-	cat <<-\EOF >expect &&
+	cat <<-EOF >expect &&
 	diff --git a/x b/x
-	index adf3937..6edc172 100644
+	index $before..$after 100644
 	--- a/x
 	+++ b/x
 	@@ -1,3 +1,5 @@
@@ -61,6 +63,7 @@ test_expect_success 'another test, without options' '
 	EOF
 
 	git update-index x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 
 	tr "_" " " <<-\EOF >x &&
 	_	whitespace at beginning
@@ -70,10 +73,11 @@ test_expect_success 'another test, without options' '
 	unchanged line
 	CR at end
 	EOF
+	after=$(git rev-parse --short $(git hash-object x)) &&
 
-	tr "Q_" "\015 " <<-\EOF >expect &&
+	tr "Q_" "\015 " <<-EOF >expect &&
 	diff --git a/x b/x
-	index d99af23..22d9f73 100644
+	index $before..$after 100644
 	--- a/x
 	+++ b/x
 	@@ -1,6 +1,6 @@
@@ -108,9 +112,9 @@ test_expect_success 'another test, without options' '
 	git diff -w --ignore-cr-at-eol >out &&
 	test_must_be_empty out &&
 
-	tr "Q_" "\015 " <<-\EOF >expect &&
+	tr "Q_" "\015 " <<-EOF >expect &&
 	diff --git a/x b/x
-	index d99af23..22d9f73 100644
+	index $before..$after 100644
 	--- a/x
 	+++ b/x
 	@@ -1,6 +1,6 @@
@@ -132,9 +136,9 @@ test_expect_success 'another test, without options' '
 	git diff -b --ignore-cr-at-eol >out &&
 	test_cmp expect out &&
 
-	tr "Q_" "\015 " <<-\EOF >expect &&
+	tr "Q_" "\015 " <<-EOF >expect &&
 	diff --git a/x b/x
-	index d99af23..22d9f73 100644
+	index $before..$after 100644
 	--- a/x
 	+++ b/x
 	@@ -1,6 +1,6 @@
@@ -154,9 +158,9 @@ test_expect_success 'another test, without options' '
 	git diff --ignore-space-at-eol --ignore-cr-at-eol >out &&
 	test_cmp expect out &&
 
-	tr "Q_" "\015 " <<-\EOF >expect &&
+	tr "Q_" "\015 " <<-EOF >expect &&
 	diff --git a/x b/x
-	index_d99af23..22d9f73 100644
+	index_$before..$after 100644
 	--- a/x
 	+++ b/x
 	@@ -1,6 +1,6 @@
@@ -786,23 +790,25 @@ test_expect_success 'whitespace-only changes not reported' '
 	test_must_be_empty actual
 '
 
-cat <<EOF >expect
-diff --git a/x b/z
-similarity index NUM%
-rename from x
-rename to z
-index 380c32a..a97b785 100644
-EOF
 test_expect_success 'whitespace-only changes reported across renames' '
 	git reset --hard &&
 	for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i"; done >x &&
 	git add x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 	git commit -m "base" &&
 	sed -e "5s/^/ /" x >z &&
 	git rm x &&
 	git add z &&
+	after=$(git rev-parse --short $(git hash-object z)) &&
 	git diff -w -M --cached |
 	sed -e "/^similarity index /s/[0-9][0-9]*/NUM/" >actual &&
+	cat <<-EOF >expect &&
+	diff --git a/x b/z
+	similarity index NUM%
+	rename from x
+	rename to z
+	index $before..$after 100644
+	EOF
 	test_cmp expect actual
 '
 
@@ -858,13 +864,15 @@ test_expect_success 'diff that introduces a line with only tabs' '
 	git config core.whitespace blank-at-eol &&
 	git reset --hard &&
 	echo "test" >x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 	git commit -m "initial" x &&
 	echo "{NTN}" | tr "NT" "\n\t" >>x &&
+	after=$(git rev-parse --short $(git hash-object x)) &&
 	git diff --color | test_decode_color >current &&
 
-	cat >expected <<-\EOF &&
+	cat >expected <<-EOF &&
 	<BOLD>diff --git a/x b/x<RESET>
-	<BOLD>index 9daeafb..2874b91 100644<RESET>
+	<BOLD>index $before..$after 100644<RESET>
 	<BOLD>--- a/x<RESET>
 	<BOLD>+++ b/x<RESET>
 	<CYAN>@@ -1 +1,4 @@<RESET>
@@ -883,19 +891,21 @@ test_expect_success 'diff that introduces and removes ws breakages' '
 		echo "0. blank-at-eol " &&
 		echo "1. blank-at-eol "
 	} >x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 	git commit -a --allow-empty -m preimage &&
 	{
 		echo "0. blank-at-eol " &&
 		echo "1. still-blank-at-eol " &&
 		echo "2. and a new line "
 	} >x &&
+	after=$(git rev-parse --short $(git hash-object x)) &&
 
 	git diff --color |
 	test_decode_color >current &&
 
-	cat >expected <<-\EOF &&
+	cat >expected <<-EOF &&
 	<BOLD>diff --git a/x b/x<RESET>
-	<BOLD>index d0233a2..700886e 100644<RESET>
+	<BOLD>index $before..$after 100644<RESET>
 	<BOLD>--- a/x<RESET>
 	<BOLD>+++ b/x<RESET>
 	<CYAN>@@ -1,2 +1,3 @@<RESET>
@@ -915,16 +925,18 @@ test_expect_success 'ws-error-highlight test setup' '
 		echo "0. blank-at-eol " &&
 		echo "1. blank-at-eol "
 	} >x &&
+	before=$(git rev-parse --short $(git hash-object x)) &&
 	git commit -a --allow-empty -m preimage &&
 	{
 		echo "0. blank-at-eol " &&
 		echo "1. still-blank-at-eol " &&
 		echo "2. and a new line "
 	} >x &&
+	after=$(git rev-parse --short $(git hash-object x)) &&
 
-	cat >expect.default-old <<-\EOF &&
+	cat >expect.default-old <<-EOF &&
 	<BOLD>diff --git a/x b/x<RESET>
-	<BOLD>index d0233a2..700886e 100644<RESET>
+	<BOLD>index $before..$after 100644<RESET>
 	<BOLD>--- a/x<RESET>
 	<BOLD>+++ b/x<RESET>
 	<CYAN>@@ -1,2 +1,3 @@<RESET>
@@ -934,9 +946,9 @@ test_expect_success 'ws-error-highlight test setup' '
 	<GREEN>+<RESET><GREEN>2. and a new line<RESET><BLUE> <RESET>
 	EOF
 
-	cat >expect.all <<-\EOF &&
+	cat >expect.all <<-EOF &&
 	<BOLD>diff --git a/x b/x<RESET>
-	<BOLD>index d0233a2..700886e 100644<RESET>
+	<BOLD>index $before..$after 100644<RESET>
 	<BOLD>--- a/x<RESET>
 	<BOLD>+++ b/x<RESET>
 	<CYAN>@@ -1,2 +1,3 @@<RESET>
@@ -946,9 +958,9 @@ test_expect_success 'ws-error-highlight test setup' '
 	<GREEN>+<RESET><GREEN>2. and a new line<RESET><BLUE> <RESET>
 	EOF
 
-	cat >expect.none <<-\EOF
+	cat >expect.none <<-EOF
 	<BOLD>diff --git a/x b/x<RESET>
-	<BOLD>index d0233a2..700886e 100644<RESET>
+	<BOLD>index $before..$after 100644<RESET>
 	<BOLD>--- a/x<RESET>
 	<BOLD>+++ b/x<RESET>
 	<CYAN>@@ -1,2 +1,3 @@<RESET>
@@ -1022,14 +1034,15 @@ test_expect_success 'detect moved code, complete file' '
 	EOF
 	git add test.c &&
 	git commit -m "add main function" &&
+	file=$(git rev-parse --short HEAD:test.c) &&
 	git mv test.c main.c &&
 	test_config color.diff.oldMoved "normal red" &&
 	test_config color.diff.newMoved "normal green" &&
 	git diff HEAD --color-moved=zebra --color --no-renames | test_decode_color >actual &&
-	cat >expected <<-\EOF &&
+	cat >expected <<-EOF &&
 	<BOLD>diff --git a/main.c b/main.c<RESET>
 	<BOLD>new file mode 100644<RESET>
-	<BOLD>index 0000000..a986c57<RESET>
+	<BOLD>index 0000000..$file<RESET>
 	<BOLD>--- /dev/null<RESET>
 	<BOLD>+++ b/main.c<RESET>
 	<CYAN>@@ -0,0 +1,5 @@<RESET>
@@ -1040,7 +1053,7 @@ test_expect_success 'detect moved code, complete file' '
 	<BGREEN>+<RESET><BGREEN>}<RESET>
 	<BOLD>diff --git a/test.c b/test.c<RESET>
 	<BOLD>deleted file mode 100644<RESET>
-	<BOLD>index a986c57..0000000<RESET>
+	<BOLD>index $file..0000000<RESET>
 	<BOLD>--- a/test.c<RESET>
 	<BOLD>+++ /dev/null<RESET>
 	<CYAN>@@ -1,5 +0,0 @@<RESET>
@@ -1094,6 +1107,8 @@ test_expect_success 'detect malicious moved code, inside file' '
 	EOF
 	git add main.c test.c &&
 	git commit -m "add main and test file" &&
+	before_main=$(git rev-parse --short HEAD:main.c) &&
+	before_test=$(git rev-parse --short HEAD:test.c) &&
 	cat <<-\EOF >main.c &&
 		#include<stdio.h>
 		int stuff()
@@ -1126,10 +1141,12 @@ test_expect_success 'detect malicious moved code, inside file' '
 			bar();
 		}
 	EOF
+	after_main=$(git rev-parse --short $(git hash-object main.c)) &&
+	after_test=$(git rev-parse --short $(git hash-object test.c)) &&
 	git diff HEAD --no-renames --color-moved=zebra --color | test_decode_color >actual &&
-	cat <<-\EOF >expected &&
+	cat <<-EOF >expected &&
 	<BOLD>diff --git a/main.c b/main.c<RESET>
-	<BOLD>index 27a619c..7cf9336 100644<RESET>
+	<BOLD>index $before_main..$after_main 100644<RESET>
 	<BOLD>--- a/main.c<RESET>
 	<BOLD>+++ b/main.c<RESET>
 	<CYAN>@@ -5,13 +5,6 @@<RESET> <RESET>printf("Hello ");<RESET>
@@ -1147,7 +1164,7 @@ test_expect_success 'detect malicious moved code, inside file' '
 	 {<RESET>
 	 foo();<RESET>
 	<BOLD>diff --git a/test.c b/test.c<RESET>
-	<BOLD>index 1dc1d85..2bedec9 100644<RESET>
+	<BOLD>index $before_test..$after_test 100644<RESET>
 	<BOLD>--- a/test.c<RESET>
 	<BOLD>+++ b/test.c<RESET>
 	<CYAN>@@ -4,6 +4,13 @@<RESET> <RESET>int bar()<RESET>
@@ -1176,9 +1193,9 @@ test_expect_success 'plain moved code, inside file' '
 	test_config color.diff.newMovedAlternative "yellow" &&
 	# needs previous test as setup
 	git diff HEAD --no-renames --color-moved=plain --color | test_decode_color >actual &&
-	cat <<-\EOF >expected &&
+	cat <<-EOF >expected &&
 	<BOLD>diff --git a/main.c b/main.c<RESET>
-	<BOLD>index 27a619c..7cf9336 100644<RESET>
+	<BOLD>index $before_main..$after_main 100644<RESET>
 	<BOLD>--- a/main.c<RESET>
 	<BOLD>+++ b/main.c<RESET>
 	<CYAN>@@ -5,13 +5,6 @@<RESET> <RESET>printf("Hello ");<RESET>
@@ -1196,7 +1213,7 @@ test_expect_success 'plain moved code, inside file' '
 	 {<RESET>
 	 foo();<RESET>
 	<BOLD>diff --git a/test.c b/test.c<RESET>
-	<BOLD>index 1dc1d85..2bedec9 100644<RESET>
+	<BOLD>index $before_test..$after_test 100644<RESET>
 	<BOLD>--- a/test.c<RESET>
 	<BOLD>+++ b/test.c<RESET>
 	<CYAN>@@ -4,6 +4,13 @@<RESET> <RESET>int bar()<RESET>