diff --git a/t/t4000-diff-format.sh b/t/t4000-diff-format.sh
index cce334981e..bfcaae390f 100755
--- a/t/t4000-diff-format.sh
+++ b/t/t4000-diff-format.sh
@@ -6,6 +6,8 @@
 test_description='Test built-in diff output engine.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t4003-diff-rename-1.sh b/t/t4003-diff-rename-1.sh
index f4485a87c6..181e9683a7 100755
--- a/t/t4003-diff-rename-1.sh
+++ b/t/t4003-diff-rename-1.sh
@@ -6,6 +6,8 @@
 test_description='More rename detection
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
diff --git a/t/t4004-diff-rename-symlink.sh b/t/t4004-diff-rename-symlink.sh
index 3d495e37bb..8def4d4aee 100755
--- a/t/t4004-diff-rename-symlink.sh
+++ b/t/t4004-diff-rename-symlink.sh
@@ -9,6 +9,8 @@ The rename detection logic should be able to detect pure rename or
 copy of symbolic links, but should not produce rename/copy followed
 by an edit for them.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t4005-diff-rename-2.sh b/t/t4005-diff-rename-2.sh
index 6f1b323f97..5c756dc243 100755
--- a/t/t4005-diff-rename-2.sh
+++ b/t/t4005-diff-rename-2.sh
@@ -5,6 +5,8 @@
 
 test_description='Same rename detection as t4003 but testing diff-raw.'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
diff --git a/t/t4006-diff-mode.sh b/t/t4006-diff-mode.sh
index 6cdee2a216..dbd4c0da21 100755
--- a/t/t4006-diff-mode.sh
+++ b/t/t4006-diff-mode.sh
@@ -6,6 +6,8 @@
 test_description='Test mode change diffs.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 sed_script='s/\(:100644 100755\) \('"$OID_REGEX"'\) \2 /\1 X X /'
diff --git a/t/t4009-diff-rename-4.sh b/t/t4009-diff-rename-4.sh
index 59b7f44f05..3480781dab 100755
--- a/t/t4009-diff-rename-4.sh
+++ b/t/t4009-diff-rename-4.sh
@@ -6,6 +6,8 @@
 test_description='Same rename detection as t4003 but testing diff-raw -z.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index 1bbced79ec..9d9650eba7 100755
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -9,6 +9,8 @@ Prepare:
         file0
         path1/file1
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
diff --git a/t/t4011-diff-symlink.sh b/t/t4011-diff-symlink.sh
index 5a25c259fe..d7a5f7ae78 100755
--- a/t/t4011-diff-symlink.sh
+++ b/t/t4011-diff-symlink.sh
@@ -6,6 +6,8 @@
 test_description='Test diff of symlinks.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 33ff588ebc..00eeafb2ac 100755
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -6,6 +6,7 @@
 test_description='Binary diff and apply
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expect.binary-numstat <<\EOF
diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index e009826fcb..54bb8ef27e 100755
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -2,6 +2,7 @@
 
 test_description='external diff interface test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4024-diff-optimize-common.sh b/t/t4024-diff-optimize-common.sh
index 6b44ce1493..540f93715e 100755
--- a/t/t4024-diff-optimize-common.sh
+++ b/t/t4024-diff-optimize-common.sh
@@ -2,6 +2,7 @@
 
 test_description='common tail optimization'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 z=zzzzzzzz ;# 8
diff --git a/t/t4027-diff-submodule.sh b/t/t4027-diff-submodule.sh
index 94ef77e1df..6cef0da982 100755
--- a/t/t4027-diff-submodule.sh
+++ b/t/t4027-diff-submodule.sh
@@ -2,6 +2,7 @@
 
 test_description='difference in submodules'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t4029-diff-trailing-space.sh b/t/t4029-diff-trailing-space.sh
index 32b6e9a4e7..5f8ffef74b 100755
--- a/t/t4029-diff-trailing-space.sh
+++ b/t/t4029-diff-trailing-space.sh
@@ -4,6 +4,7 @@
 #
 test_description='diff honors config option, diff.suppressBlankEmpty'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat <<\EOF >expected ||
diff --git a/t/t4032-diff-inter-hunk-context.sh b/t/t4032-diff-inter-hunk-context.sh
index bada0cbd32..7db92d0d9f 100755
--- a/t/t4032-diff-inter-hunk-context.sh
+++ b/t/t4032-diff-inter-hunk-context.sh
@@ -2,6 +2,7 @@
 
 test_description='diff hunk fusing'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 f() {
diff --git a/t/t4033-diff-patience.sh b/t/t4033-diff-patience.sh
index 113304dc59..f7be7f5ef0 100755
--- a/t/t4033-diff-patience.sh
+++ b/t/t4033-diff-patience.sh
@@ -2,6 +2,7 @@
 
 test_description='patience diff algorithm'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff-alternative.sh
 
diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 561c582d16..d5abcf4b4c 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -2,6 +2,7 @@
 
 test_description='word diff colors'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t4035-diff-quiet.sh b/t/t4035-diff-quiet.sh
index 0352bf81a9..76f8034c60 100755
--- a/t/t4035-diff-quiet.sh
+++ b/t/t4035-diff-quiet.sh
@@ -2,6 +2,7 @@
 
 test_description='Return value of diffs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4037-diff-r-t-dirs.sh b/t/t4037-diff-r-t-dirs.sh
index f5ce3b29a2..b5f96fe23b 100755
--- a/t/t4037-diff-r-t-dirs.sh
+++ b/t/t4037-diff-r-t-dirs.sh
@@ -2,6 +2,7 @@
 
 test_description='diff -r -t shows directory additions and deletions'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4040-whitespace-status.sh b/t/t4040-whitespace-status.sh
index 3c728a3ebf..e70e020ae9 100755
--- a/t/t4040-whitespace-status.sh
+++ b/t/t4040-whitespace-status.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff --exit-code with whitespace'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4046-diff-unmerged.sh b/t/t4046-diff-unmerged.sh
index ff7cfd884a..fd3f3a7260 100755
--- a/t/t4046-diff-unmerged.sh
+++ b/t/t4046-diff-unmerged.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff with unmerged index entries'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4049-diff-stat-count.sh b/t/t4049-diff-stat-count.sh
index 53061b104e..f5b35e7860 100755
--- a/t/t4049-diff-stat-count.sh
+++ b/t/t4049-diff-stat-count.sh
@@ -2,6 +2,8 @@
 # Copyright (c) 2011, Google Inc.
 
 test_description='diff --stat-count'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4050-diff-histogram.sh b/t/t4050-diff-histogram.sh
index fd3e86a74f..c61b30f96d 100755
--- a/t/t4050-diff-histogram.sh
+++ b/t/t4050-diff-histogram.sh
@@ -2,6 +2,7 @@
 
 test_description='histogram diff algorithm'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff-alternative.sh
 
diff --git a/t/t4054-diff-bogus-tree.sh b/t/t4054-diff-bogus-tree.sh
index 8c95f152b2..294fb55313 100755
--- a/t/t4054-diff-bogus-tree.sh
+++ b/t/t4054-diff-bogus-tree.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test diff with a bogus tree containing the null sha1'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create bogus tree' '
diff --git a/t/t4062-diff-pickaxe.sh b/t/t4062-diff-pickaxe.sh
index 1130c8019b..9aaa068ed9 100755
--- a/t/t4062-diff-pickaxe.sh
+++ b/t/t4062-diff-pickaxe.sh
@@ -5,6 +5,7 @@
 
 test_description='Pickaxe options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4063-diff-blobs.sh b/t/t4063-diff-blobs.sh
index bc69e26c52..7e6c9d6384 100755
--- a/t/t4063-diff-blobs.sh
+++ b/t/t4063-diff-blobs.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test direct comparison of blobs via git-diff'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 run_diff () {