Fix timestamp/instant isEqualTo issue

Fix #3359

assertj-core/src/main/java/org/assertj/core/internal/StandardComparisonStrategy.java

@@ -15,6 +15,7 @@
 import static org.assertj.core.util.Preconditions.checkArgument;
 
 import java.util.Collection;
+import java.util.Date;
 import java.util.Iterator;
 import java.util.Set;
 import java.util.TreeSet;
@@ -105,6 +106,9 @@ public boolean areEqual(Object actual, Object other) {
           return java.util.Arrays.deepEquals((Object[]) actual, (Object[]) other);
       }
     }
+
+    // use compareTo over equals as it deals correctly with java.sql.Timestamp
+    if (actual instanceof Date && other instanceof Date) return ((Date) actual).compareTo((Date) other) == 0;
     return actual.equals(other);
   }
 

assertj-core/src/test/java/org/assertj/core/api/instant/InstantAssert_isEqualTo_Test.java

@@ -14,9 +14,11 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
+import static org.assertj.core.api.BDDAssertions.then;
 import static org.assertj.core.test.ErrorMessagesForTest.shouldBeEqualMessage;
 import static org.assertj.core.util.AssertionsUtil.assertThatAssertionErrorIsThrownBy;
 
+import java.sql.Timestamp;
 import java.time.Instant;
 
 import org.assertj.core.api.ThrowableAssert.ThrowingCallable;
@@ -48,4 +50,16 @@ void should_fail_if_date_as_string_parameter_is_null() {
                                         .withMessage("The String representing the Instant to compare actual with should not be null");
   }
 
+  // https://github.com/assertj/assertj/issues/3359
+  @Test
+  void should_cover_issue_3359() {
+    // GIVEN
+    final long now = System.currentTimeMillis();
+    final Timestamp timestamp = new Timestamp(now);
+    final Instant instant = Instant.ofEpochMilli(now);
+    // WHEN/THEN
+    then(timestamp).isEqualTo(instant);
+    then(timestamp).isAfterOrEqualTo(instant);
+  }
+
 }

assertj-core/src/test/java/org/assertj/core/internal/StandardComparisonStrategy_areEqual_Test.java

@@ -16,6 +16,9 @@
 import static org.assertj.core.api.BDDAssertions.then;
 import static org.junit.jupiter.params.provider.Arguments.arguments;
 
+import java.sql.Timestamp;
+import java.time.Instant;
+import java.util.Date;
 import java.util.stream.Stream;
 
 import org.junit.jupiter.api.Test;
@@ -255,6 +258,29 @@ void should_return_false_if_array_is_non_null_and_other_is_null(Object actual) {
     then(result).isFalse();
   }
 
+  @Test
+  void should_return_true_if_date_and_timestamp_are_equal() {
+    // GIVEN
+    Instant now = Instant.now();
+    Date actual = Date.from(now);
+    Timestamp other = Timestamp.from(now);
+    // WHEN
+    boolean result = underTest.areEqual(actual, other);
+    // THEN
+    then(result).isTrue();
+  }
+
+  @Test
+  void should_return_false_if_dates_are_not_equal() {
+    // GIVEN
+    Date actual = Date.from(Instant.parse("2024-03-30T00:00:00.00Z"));
+    Timestamp other = Timestamp.from(Instant.parse("2024-03-30T00:00:00.01Z"));
+    // WHEN
+    boolean result = underTest.areEqual(actual, other);
+    // THEN
+    then(result).isFalse();
+  }
+
   private static Stream<Object> arrays() {
     return Stream.of(argument(new Object[] { "Luke", "Yoda", "Leia" }),
                      new byte[] { 1, 2, 3 },