Index: lib/Fuzzer/test/merge.test
===================================================================
--- lib/Fuzzer/test/merge.test
+++ lib/Fuzzer/test/merge.test
@@ -1,12 +1,13 @@
 CHECK: BINGO
 
-RUN: rm -rf  %tmp/T1 %tmp/T2
-RUN: mkdir -p %tmp/T1 %tmp/T2
-RUN: echo F..... > %tmp/T1/1
-RUN: echo .U.... > %tmp/T1/2
-RUN: echo ..Z... > %tmp/T1/3
+RUN: rm -rf %tmp/T0 %tmp/T1 %tmp/T2
+RUN: mkdir -p %tmp/T0 %tmp/T1 %tmp/T2
+RUN: echo F..... > %tmp/T0/1
+RUN: echo .U.... > %tmp/T0/2
+RUN: echo ..Z... > %tmp/T0/3
 
 # T1 has 3 elements, T2 is empty.
+RUN: cp %tmp/T0/* %tmp/T1/
 RUN: LLVMFuzzer-FullCoverageSetTest         -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=CHECK1
 CHECK1: MERGE-OUTER: 3 files, 3 in the initial corpus
 CHECK1: MERGE-OUTER: 0 new files with 0 new features added
@@ -29,13 +30,15 @@
 CHECK3: MERGE-OUTER: 0 new files with 0 new features added
 
 # Check that we respect max_len during the merge and don't crash.
-RUN: rm %tmp/T1/??*
+RUN: rm %tmp/T1/*
+RUN: cp %tmp/T0/* %tmp/T1/
 RUN: echo looooooooong > %tmp/T2/looooooooong
 RUN: LLVMFuzzer-FullCoverageSetTest         -merge=1 %tmp/T1 %tmp/T2 -max_len=6 2>&1 | FileCheck %s --check-prefix=MAX_LEN
 MAX_LEN: MERGE-OUTER: 3 new files
 
 # Check that merge tolerates failures.
-RUN: rm %tmp/T1/??*
+RUN: rm %tmp/T1/*
+RUN: cp %tmp/T0/* %tmp/T1/
 RUN: echo 'FUZZER' > %tmp/T2/FUZZER
 RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=MERGE_WITH_CRASH
 MERGE_WITH_CRASH: MERGE-OUTER: succesfull in 2 attempt(s)