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diff --git a/test/tools/llvm-cov/threads.c b/test/tools/llvm-cov/threads.c
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+// Coverage/profile data recycled from the showLineExecutionCounts.cpp test.
+//
+// RUN: llvm-profdata merge %S/Inputs/lineExecutionCounts.proftext -o %t.profdata
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -j 1 -o %t1.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -num-threads 2 -o %t2.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -o %t3.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
+//
+// RUN: diff %t1.dir/index.txt %t2.dir/index.txt
+// RUN: diff %t1.dir/coverage/tmp/showLineExecutionCounts.cpp.txt %t2.dir/coverage/tmp/showLineExecutionCounts.cpp.txt
+// RUN: diff %t1.dir/index.txt %t3.dir/index.txt
+// RUN: diff %t1.dir/coverage/tmp/showLineExecutionCounts.cpp.txt %t3.dir/coverage/tmp/showLineExecutionCounts.cpp.txt