What breaks if I do this?

PiperOrigin-RevId: 806235046

Author: carmenyh

src/main/kotlin/testing/FakeCalendar.kt

@@ -21,7 +21,7 @@ import java.time.LocalDate
 import java.time.ZoneId
 import java.util.Date
 
-class FakeCalendar(val today: LocalDate = LocalDate.of(2024, 10, 20)) {
+class FakeCalendar(val today: LocalDate = LocalDate.now()) {
   fun today(): Date = today.toDate()
 
   fun now(): Instant = today.atStartOfDay(ZoneId.of("UTC")).toInstant()
@@ -30,6 +30,8 @@ class FakeCalendar(val today: LocalDate = LocalDate.of(2024, 10, 20)) {
 
   fun tomorrow(): Date = today.plusDays(1).toDate()
 
+  fun nextYear(): Date = today.plusYears(1).toDate()
+
   private fun Instant.toDate() = Date.from(this)
 
   private fun LocalDate.toDate() = this.atStartOfDay(ZoneId.of("UTC")).toInstant().toDate()

src/test/kotlin/provider/KeyAttestationCertPathValidatorTest.kt

@@ -78,23 +78,19 @@ class KeyAttestationCertPathValidatorTest {
   }
 
   @Test
-  fun nullDate_throwsCertPathValidatorException() {
-    val exception =
+  fun nullDate_assumesNow() {
+    val unused =
+      certPathValidator.validate(Chains.validFactoryProvisioned, PKIXParameters(setOf(testAnchor)))
+    val notValidException =
       assertFailsWith<CertPathValidatorException> {
-        certPathValidator.validate(
-          Chains.validFactoryProvisioned,
-          PKIXParameters(setOf(testAnchor)),
-        )
+        certPathValidator.validate(Chains.notYetValid, PKIXParameters(setOf(testAnchor)))
       }
-    val pkixException =
+    val expiredException =
       assertFailsWith<CertPathValidatorException> {
-        pkixCertPathValidator.validate(
-          Chains.validFactoryProvisioned,
-          PKIXParameters(setOf(testAnchor)),
-        )
+        certPathValidator.validate(Chains.expired, PKIXParameters(setOf(testAnchor)))
       }
-    assertThat(exception.reason).isEqualTo(BasicReason.EXPIRED)
-    assertThat(pkixException.reason).isEqualTo(BasicReason.EXPIRED)
+    assertThat(notValidException.reason).isEqualTo(BasicReason.NOT_YET_VALID)
+    assertThat(expiredException.reason).isEqualTo(BasicReason.EXPIRED)
   }
 
   @Test