diff --git a/llvm/unittests/tools/llvm-exegesis/BenchmarkResultTest.cpp b/llvm/unittests/tools/llvm-exegesis/BenchmarkResultTest.cpp
index d1239a4..82c9481 100644
--- a/llvm/unittests/tools/llvm-exegesis/BenchmarkResultTest.cpp
+++ b/llvm/unittests/tools/llvm-exegesis/BenchmarkResultTest.cpp
@@ -44,6 +44,7 @@
   ToDisk.writeYamlOrDie(Filename);
 
   {
+    // One-element version.
     const auto FromDisk = InstructionBenchmark::readYamlOrDie(Filename);
 
     EXPECT_EQ(FromDisk.AsmTmpl.Name, ToDisk.AsmTmpl.Name);
@@ -53,6 +54,18 @@
     EXPECT_THAT(FromDisk.Measurements, ToDisk.Measurements);
     EXPECT_THAT(FromDisk.Error, ToDisk.Error);
   }
+  {
+    // Vector version.
+    const auto FromDiskVector = InstructionBenchmark::readYamlsOrDie(Filename);
+    ASSERT_EQ(FromDiskVector.size(), 1);
+    const auto FromDisk = FromDiskVector[0];
+    EXPECT_EQ(FromDisk.AsmTmpl.Name, ToDisk.AsmTmpl.Name);
+    EXPECT_EQ(FromDisk.CpuName, ToDisk.CpuName);
+    EXPECT_EQ(FromDisk.LLVMTriple, ToDisk.LLVMTriple);
+    EXPECT_EQ(FromDisk.NumRepetitions, ToDisk.NumRepetitions);
+    EXPECT_THAT(FromDisk.Measurements, ToDisk.Measurements);
+    EXPECT_THAT(FromDisk.Error, ToDisk.Error);
+  }
 }
 
 } // namespace