Provide method for returning certificate expiration timestamp.

webrtc/base/sslidentity_unittest.cc

Index: webrtc/base/sslidentity_unittest.cc
diff --git a/webrtc/base/sslidentity_unittest.cc b/webrtc/base/sslidentity_unittest.cc
index e8df41506ba90383e9ca89969e75b5b20fe38eeb..eb1441b2d9176e26049efd8a21698563809e3c27 100644
--- a/webrtc/base/sslidentity_unittest.cc
+++ b/webrtc/base/sslidentity_unittest.cc
@@ -11,6 +11,7 @@
 #include <string>
 
 #include "webrtc/base/gunit.h"
+#include "webrtc/base/helpers.h"
 #include "webrtc/base/ssladapter.h"
 #include "webrtc/base/sslidentity.h"
 
@@ -295,3 +296,29 @@ TEST_F(SSLIdentityTest, PemDerConversion) {
 TEST_F(SSLIdentityTest, GetSignatureDigestAlgorithm) {
   TestGetSignatureDigestAlgorithm();
 }
+
+class SSLIdentityExpirationTest : public testing::Test {
+ public:
+  SSLIdentityExpirationTest() {}
+  ~SSLIdentityExpirationTest() {}
+
+  void TestExpireTime(int times) {
+    for (int i = 0; i < times; i++) {
+      rtc::SSLIdentityParams params;
+      params.common_name = "";
+      params.not_before = 0;
+      params.not_after = rtc::CreateRandomId() % 0x80000000;

[hbos, 2015/11/25 15:21:45]

Add a comment explaining the %

[torbjorng (webrtc), 2015/11/25 19:14:09]

Done.

+      params.key_params = rtc::KeyParams(rtc::KT_ECDSA);
+      SSLIdentity* identity = rtc::SSLIdentity::GenerateForTest(params);
+      EXPECT_EQ((int64_t)1000 * params.not_after,
+                identity->certificate().CertificateExpirationTime());
+      delete identity;
+    }
+  }
+};
+
+TEST_F(SSLIdentityExpirationTest, Test) {
+  rtc::SetRandomTestMode(true);
+  TestExpireTime(100);
+  rtc::SetRandomTestMode(false);
+}