On 07/27/2016 02:06 AM, larsxschnei...@gmail.com wrote:
From: Lars Schneider <larsxschnei...@gmail.com>

Generate a more interesting large test file with random characters in
between and reuse this test file in multiple tests. Run tests formerly
marked as EXPENSIVE every time but with a smaller test file.

Signed-off-by: Lars Schneider <larsxschnei...@gmail.com>
---
 t/t0021-conversion.sh | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index 7b45136..b9911a4 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -4,6 +4,13 @@ test_description='blob conversion via gitattributes'

 . ./test-lib.sh

+if test_have_prereq EXPENSIVE
+then
+       T0021_LARGE_FILE_SIZE=2048
+else
+       T0021_LARGE_FILE_SIZE=30
+fi
+
 cat <<EOF >rot13.sh
 #!$SHELL_PATH
 tr \
@@ -31,7 +38,15 @@ test_expect_success setup '
        cat test >test.i &&
        git add test test.t test.i &&
        rm -f test test.t test.i &&
-       git checkout -- test test.t test.i
+       git checkout -- test test.t test.i &&
+
+       mkdir -p generated-test-data &&
+       for i in $(test_seq 1 $T0021_LARGE_FILE_SIZE)
+       do
+               # Generate 1MB of empty data and 100 bytes of random characters
+               printf "%1048576d" 1
+               printf "$(LC_ALL=C tr -dc "A-Za-z0-9" </dev/urandom | dd 
bs=$((RANDOM>>8)) count=1 2>/dev/null)"
I'm not sure how portable /dev/urandom is.
The other thing, that "really random" numbers are an overkill, and
it may be easier to use pre-defined numbers,

The rest of 1..4 looks good, I will look at 5/5 later.

+       done >generated-test-data/large.file
 '

 script='s/^\$Id: \([0-9a-f]*\) \$/\1/p'
@@ -199,9 +214,9 @@ test_expect_success 'required filter clean failure' '
 test_expect_success 'filtering large input to small output should use little 
memory' '
        test_config filter.devnull.clean "cat >/dev/null" &&
        test_config filter.devnull.required true &&
-       for i in $(test_seq 1 30); do printf "%1048576d" 1; done >30MB &&
-       echo "30MB filter=devnull" >.gitattributes &&
-       GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add 30MB
+       cp generated-test-data/large.file large.file &&
+       echo "large.file filter=devnull" >.gitattributes &&
+       GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add large.file
 '

 test_expect_success 'filter that does not read is fine' '
@@ -214,15 +229,15 @@ test_expect_success 'filter that does not read is fine' '
        test_cmp expect actual
 '

-test_expect_success EXPENSIVE 'filter large file' '
+test_expect_success 'filter large file' '
        test_config filter.largefile.smudge cat &&
        test_config filter.largefile.clean cat &&
-       for i in $(test_seq 1 2048); do printf "%1048576d" 1; done >2GB &&
-       echo "2GB filter=largefile" >.gitattributes &&
-       git add 2GB 2>err &&
+       echo "large.file filter=largefile" >.gitattributes &&
+       cp generated-test-data/large.file large.file &&
+       git add large.file 2>err &&
        test_must_be_empty err &&
-       rm -f 2GB &&
-       git checkout -- 2GB 2>err &&
+       rm -f large.file &&
+       git checkout -- large.file 2>err &&
        test_must_be_empty err
 '


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