diff --git a/libs/battery/LongArrayMultiStateCounterTest.cpp b/libs/battery/LongArrayMultiStateCounterTest.cpp
index 24cb437..e4e6b2a 100644
--- a/libs/battery/LongArrayMultiStateCounterTest.cpp
+++ b/libs/battery/LongArrayMultiStateCounterTest.cpp
@@ -24,7 +24,9 @@
 class LongArrayMultiStateCounterTest : public testing::Test {};
 
 TEST_F(LongArrayMultiStateCounterTest, stateChange) {
-    LongArrayMultiStateCounter testCounter(2, 0, std::vector<uint64_t>(4), 1000);
+    LongArrayMultiStateCounter testCounter(2, std::vector<uint64_t>(4));
+    testCounter.updateValue(std::vector<uint64_t>({0, 0, 0, 0}), 1000);
+    testCounter.setState(0, 1000);
     testCounter.setState(1, 2000);
     testCounter.updateValue(std::vector<uint64_t>({100, 200, 300, 400}), 3000);
 
@@ -34,7 +36,9 @@
 }
 
 TEST_F(LongArrayMultiStateCounterTest, accumulation) {
-    LongArrayMultiStateCounter testCounter(2, 0, std::vector<uint64_t>(4), 1000);
+    LongArrayMultiStateCounter testCounter(2, std::vector<uint64_t>(4));
+    testCounter.updateValue(std::vector<uint64_t>({0, 0, 0, 0}), 1000);
+    testCounter.setState(0, 1000);
     testCounter.setState(1, 2000);
     testCounter.updateValue(std::vector<uint64_t>({100, 200, 300, 400}), 3000);
     testCounter.setState(0, 4000);
@@ -50,5 +54,16 @@
     EXPECT_EQ(std::vector<uint64_t>({70, 120, 170, 220}), testCounter.getCount(1));
 }
 
+TEST_F(LongArrayMultiStateCounterTest, toString) {
+    LongArrayMultiStateCounter testCounter(2, std::vector<uint64_t>(4));
+    testCounter.updateValue(std::vector<uint64_t>({0, 0, 0, 0}), 1000);
+    testCounter.setState(0, 1000);
+    testCounter.setState(1, 2000);
+    testCounter.updateValue(std::vector<uint64_t>({100, 200, 300, 400}), 3000);
+
+    EXPECT_STREQ("[0: {50, 100, 150, 200}, 1: {50, 100, 150, 200}] updated: 3000 currentState: 1",
+                 testCounter.toString().c_str());
+}
+
 } // namespace battery
 } // namespace android