In t4015 we have a pattern of

    git diff [<options, related to color>] |
        grep -v "index" |
        test_decode_color >actual &&

to produce output that we want to test against. This pattern was introduced
in 86b452e2769 (diff.c: add dimming to moved line detection, 2017-06-30)
as then the focus on getting the colors right. However the pattern used
is not best practice as we do care about the exit code of Git. So let's
not have Git as the upstream of a pipe. Piping the output of grep to
some function is fine as we assume grep to be un-flawed in our test suite.

Signed-off-by: Stefan Beller <sbel...@google.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 t/t4015-diff-whitespace.sh | 50 +++++++++++++++-----------------------
 1 file changed, 20 insertions(+), 30 deletions(-)

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 17df491a3ab..ddbc3901385 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -1271,9 +1271,8 @@ test_expect_success 'detect permutations inside moved 
code -- dimmed_zebra' '
        test_config color.diff.newMovedDimmed "normal cyan" &&
        test_config color.diff.oldMovedAlternativeDimmed "normal blue" &&
        test_config color.diff.newMovedAlternativeDimmed "normal yellow" &&
-       git diff HEAD --no-renames --color-moved=dimmed_zebra --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --color-moved=dimmed_zebra --color 
>actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1315,9 +1314,8 @@ test_expect_success 'cmd option assumes configured 
colored-moved' '
        test_config color.diff.oldMovedAlternativeDimmed "normal blue" &&
        test_config color.diff.newMovedAlternativeDimmed "normal yellow" &&
        test_config diff.colorMoved zebra &&
-       git diff HEAD --no-renames --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1395,9 +1393,8 @@ test_expect_success 'move detection ignoring whitespace ' 
'
        line 4
        line 5
        EOF
-       git diff HEAD --no-renames --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1419,9 +1416,8 @@ test_expect_success 'move detection ignoring whitespace ' 
'
        EOF
        test_cmp expected actual &&
 
-       git diff HEAD --no-renames -w --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames -w --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1459,9 +1455,8 @@ test_expect_success 'move detection ignoring whitespace 
changes' '
        line 5
        EOF
 
-       git diff HEAD --no-renames --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1483,9 +1478,8 @@ test_expect_success 'move detection ignoring whitespace 
changes' '
        EOF
        test_cmp expected actual &&
 
-       git diff HEAD --no-renames -b --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames -b --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1526,9 +1520,8 @@ test_expect_success 'move detection ignoring whitespace 
at eol' '
        # avoid cluttering the output with complaints about our eol whitespace
        test_config core.whitespace -blank-at-eol &&
 
-       git diff HEAD --no-renames --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --color-moved --color >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1550,9 +1543,8 @@ test_expect_success 'move detection ignoring whitespace 
at eol' '
        EOF
        test_cmp expected actual &&
 
-       git diff HEAD --no-renames --ignore-space-at-eol --color-moved --color |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --no-renames --ignore-space-at-eol --color-moved --color 
>actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat <<-\EOF >expected &&
        <BOLD>diff --git a/lines.txt b/lines.txt<RESET>
        <BOLD>--- a/lines.txt<RESET>
@@ -1597,9 +1589,8 @@ test_expect_success '--color-moved block at end of diff 
output respects MIN_ALNU
        irrelevant_line
        EOF
 
-       git diff HEAD --color-moved=zebra --color --no-renames |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --color-moved=zebra --color --no-renames >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat >expected <<-\EOF &&
        <BOLD>diff --git a/bar b/bar<RESET>
        <BOLD>--- a/bar<RESET>
@@ -1636,9 +1627,8 @@ test_expect_success '--color-moved respects 
MIN_ALNUM_COUNT' '
        nineteen chars 456789
        EOF
 
-       git diff HEAD --color-moved=zebra --color --no-renames |
-               grep -v "index" |
-               test_decode_color >actual &&
+       git diff HEAD --color-moved=zebra --color --no-renames >actual.raw &&
+       grep -v "index" actual.raw | test_decode_color >actual &&
        cat >expected <<-\EOF &&
        <BOLD>diff --git a/bar b/bar<RESET>
        <BOLD>--- a/bar<RESET>
-- 
2.18.0.233.g985f88cf7e-goog

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