health 2.1 VTS: fix test on batteryFullCapacityUah

getHealthInfo_2_1 reports batteryFullCapacityUah:
- 0 if value is unknown. In such case, no requirement is enforced.
- positive if value is known. In such case, require it to be 50%~120% of
  batteryFullCharge.

Test: run on cuttlefish
Bug: 144948996

Change-Id: I7856729aafa3a19a3bfcc00e6e0ad5162f22afea
diff --git a/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp b/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp
index da9f5bb..e75b299 100644
--- a/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp
+++ b/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp
@@ -233,9 +233,13 @@
         EXPECT_TRUE(IsEnum(value.batteryCapacityLevel)) << " BatteryCapacityLevel";
         EXPECT_GE(value.batteryChargeTimeToFullNowSeconds, 0);
 
-        EXPECT_GE(value.batteryFullCapacityUah, 0) << "batteryFullCapacityUah is unknown";
-        EXPECT_GE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 0.50);
-        EXPECT_LE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 1.20);
+        EXPECT_GE(value.batteryFullCapacityUah, 0)
+                << "batteryFullCapacityUah should not be negative";
+
+        if (value.batteryFullCapacityUah > 0) {
+            EXPECT_GE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 0.50);
+            EXPECT_LE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 1.20);
+        }
     })));
 }