Fix IpSecAlgorithmTest on S

The test may be run on S builds older than itself, in which case the
resource ID may not match. Query the resource ID dynamically instead of
using the constant.

IpSecAlgorithm is not updatable in S, which is why it can use
hidden/unstable platform resources, so the test could also be skipped
altogether on S. But considering that keeping it around is not very
costly yet, this change fixes it for running on S.

Bug: 197489543
Test: atest IpSecAlgorithmTest
Change-Id: I533eede3a360a8db9089e65e017b9d7453b35539

1 files changed, 5 insertions, 2 deletions

diff --git a/tests/unit/java/android/net/IpSecAlgorithmTest.java b/tests/unit/java/android/net/IpSecAlgorithmTest.java
index c2a759b83a..c473e82945 100644
--- a/tests/unit/java/android/net/IpSecAlgorithmTest.java
+++ b/tests/unit/java/android/net/IpSecAlgorithmTest.java
@@ -217,8 +217,11 @@ public class IpSecAlgorithmTest {
         final Set<String> optionalAlgoSet = getOptionalAlgos();
         final String[] optionalAlgos = optionalAlgoSet.toArray(new String[0]);
 
-        doReturn(optionalAlgos).when(mMockResources)
-                .getStringArray(com.android.internal.R.array.config_optionalIpSecAlgorithms);
+        // Query the identifier instead of using the R.array constant, as the test may be built
+        // separately from the platform and they may not match.
+        final int resId = Resources.getSystem().getIdentifier("config_optionalIpSecAlgorithms",
+                "array", "android");
+        doReturn(optionalAlgos).when(mMockResources).getStringArray(resId);
 
         final Set<String> enabledAlgos = new HashSet<>(IpSecAlgorithm.loadAlgos(mMockResources));
         final Set<String> expectedAlgos = ALGO_TO_REQUIRED_FIRST_SDK.keySet();