[PATCH 02/12] t4015: prefer --color to -c color.diff=always

[Jeff King]

t4015 contains many color-related tests which need to
override the "is stdout a tty" check. They do so by setting
the color.diff config, but we can accomplish the same with
the --color option. Besides being shorter to type, switching
will prepare us for upcoming changes to "always" when see it
in config.

Signed-off-by: Jeff King <p...@peff.net>
---
 t/t4015-diff-whitespace.sh | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 12d182dc1b..b9df886e37 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -821,7 +821,7 @@ test_expect_success 'diff that introduces a line with only 
tabs' '
        echo "test" >x &&
        git commit -m "initial" x &&
        echo "{NTN}" | tr "NT" "\n\t" >>x &&
-       git -c color.diff=always diff | test_decode_color >current &&
+       git diff --color | test_decode_color >current &&
 
        cat >expected <<-\EOF &&
        <BOLD>diff --git a/x b/x<RESET>
@@ -851,7 +851,7 @@ test_expect_success 'diff that introduces and removes ws 
breakages' '
                echo "2. and a new line "
        } >x &&
 
-       git -c color.diff=always diff |
+       git diff --color |
        test_decode_color >current &&
 
        cat >expected <<-\EOF &&
@@ -923,15 +923,15 @@ test_expect_success 'ws-error-highlight test setup' '
 
 test_expect_success 'test --ws-error-highlight option' '
 
-       git -c color.diff=always diff --ws-error-highlight=default,old |
+       git diff --color --ws-error-highlight=default,old |
        test_decode_color >current &&
        test_cmp expect.default-old current &&
 
-       git -c color.diff=always diff --ws-error-highlight=all |
+       git diff --color --ws-error-highlight=all |
        test_decode_color >current &&
        test_cmp expect.all current &&
 
-       git -c color.diff=always diff --ws-error-highlight=none |
+       git diff --color --ws-error-highlight=none |
        test_decode_color >current &&
        test_cmp expect.none current
 
@@ -939,15 +939,15 @@ test_expect_success 'test --ws-error-highlight option' '
 
 test_expect_success 'test diff.wsErrorHighlight config' '
 
-       git -c color.diff=always -c diff.wsErrorHighlight=default,old diff |
+       git -c diff.wsErrorHighlight=default,old diff --color |
        test_decode_color >current &&
        test_cmp expect.default-old current &&
 
-       git -c color.diff=always -c diff.wsErrorHighlight=all diff |
+       git -c diff.wsErrorHighlight=all diff --color |
        test_decode_color >current &&
        test_cmp expect.all current &&
 
-       git -c color.diff=always -c diff.wsErrorHighlight=none diff |
+       git -c diff.wsErrorHighlight=none diff --color |
        test_decode_color >current &&
        test_cmp expect.none current
 
@@ -955,18 +955,18 @@ test_expect_success 'test diff.wsErrorHighlight config' '
 
 test_expect_success 'option overrides diff.wsErrorHighlight' '
 
-       git -c color.diff=always -c diff.wsErrorHighlight=none \
-               diff --ws-error-highlight=default,old |
+       git -c diff.wsErrorHighlight=none \
+               diff --color --ws-error-highlight=default,old |
        test_decode_color >current &&
        test_cmp expect.default-old current &&
 
-       git -c color.diff=always -c diff.wsErrorHighlight=default \
-               diff --ws-error-highlight=all |
+       git -c diff.wsErrorHighlight=default \
+               diff --color --ws-error-highlight=all |
        test_decode_color >current &&
        test_cmp expect.all current &&
 
-       git -c color.diff=always -c diff.wsErrorHighlight=all \
-               diff --ws-error-highlight=none |
+       git -c diff.wsErrorHighlight=all \
+               diff --color --ws-error-highlight=none |
        test_decode_color >current &&
        test_cmp expect.none current
 
-- 
2.14.2.1079.gce6b466188