diff --git a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
index 54984237..46d6fce1 100644
--- a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
+++ b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
@@ -2357,6 +2357,59 @@ TEST_F(OEMCryptoSessionTests, DecryptZeroDuration) {
   ASSERT_NO_FATAL_FAILURE(s.TestDecryptCTR());
 }
 
+TEST_F(OEMCryptoSessionTests, SimultaneousDecrypt) {
+  vector<Session> s(8);
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].open());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].LoadTestKeys());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+  // Second call to decrypt for each session.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+}
+
+TEST_F(OEMCryptoSessionTests, SimultaneousDecryptWithLostMessage) {
+  vector<Session> s(8);
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].open());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  // First set of messages are lost.  Generate second set.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].GenerateTestSessionKeys());
+    ASSERT_NO_FATAL_FAILURE(s[i].FillSimpleMessage(kDuration, 0,
+                                                   s[i].get_nonce()));
+    ASSERT_NO_FATAL_FAILURE(s[i].EncryptAndSign());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].LoadTestKeys());
+  }
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+  // Second call to decrypt for each session.
+  for (int i = 0; i < 8; i++) {
+    ASSERT_NO_FATAL_FAILURE(s[i].TestDecryptCTR());
+  }
+}
+
 class OEMCryptoSessionTestsDecryptEdgeCases : public OEMCryptoSessionTests {
  public:
   // Increment counter for AES-CTR.  The CENC spec specifies we increment only