Add vararg hasEvents assertion (#3377)

* Add vararg hasEvents assertion

* Test

docs/apidiffs/current_vs_latest/opentelemetry-sdk-testing.txt

@@ -3,3 +3,5 @@ Comparing source compatibility of  against
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) FINAL(+) io.opentelemetry.sdk.testing.assertj.SpanDataAssert hasAttributes(java.util.Map$Entry[])
 		+++  NEW ANNOTATION: java.lang.SafeVarargs
+	+++  NEW METHOD: PUBLIC(+) FINAL(+) io.opentelemetry.sdk.testing.assertj.SpanDataAssert hasEventsSatisfyingExactly(java.util.function.Consumer[])
+		+++  NEW ANNOTATION: java.lang.SafeVarargs

sdk/testing/src/main/java/io/opentelemetry/sdk/testing/assertj/SpanDataAssert.java

@@ -261,6 +261,22 @@ public final class SpanDataAssert extends AbstractAssert<SpanDataAssert, SpanDat
     return this;
   }
 
+  /**
+   * Asserts that the span under assertion has the same number of events as provided {@code
+   * assertions} and executes each {@link EventDataAssert} in {@code assertions} in order with the
+   * corresponding event.
+   */
+  @SafeVarargs
+  @SuppressWarnings("varargs")
+  public final SpanDataAssert hasEventsSatisfyingExactly(Consumer<EventDataAssert>... assertions) {
+    assertThat(actual.getEvents())
+        .hasSize(assertions.length)
+        .zipSatisfy(
+            Arrays.asList(assertions),
+            (event, assertion) -> assertion.accept(new EventDataAssert(event)));
+    return this;
+  }
+
   /** Asserts the span has the given links. */
   public SpanDataAssert hasLinks(Iterable<LinkData> links) {
     isNotNull();

sdk/testing/src/test/java/io/opentelemetry/sdk/testing/assertj/OpenTelemetryAssertionsTest.java

@@ -171,6 +171,8 @@ class OpenTelemetryAssertionsTest {
                       attributes -> assertThat(attributes).isEqualTo(Attributes.empty()))
                   .hasAttributesSatisfying(attributes -> assertThat(attributes).isEmpty());
             })
+        .hasEventsSatisfyingExactly(
+            event -> event.hasName("event"), event -> event.hasName("event2"))
         .hasLinks(LINKS)
         .hasLinks(LINKS.toArray(new LinkData[0]))
         .hasLinksSatisfying(links -> assertThat(links).hasSize(LINKS.size()))
@@ -250,6 +252,9 @@ class OpenTelemetryAssertionsTest {
                 assertThat(SPAN1)
                     .hasEventsSatisfying(events -> assertThat(events.get(0)).hasName("notevent")))
         .isInstanceOf(AssertionError.class);
+    assertThatThrownBy(
+            () -> assertThat(SPAN1).hasEventsSatisfyingExactly(event -> event.hasName("notevent")))
+        .isInstanceOf(AssertionError.class);
     assertThatThrownBy(
             () ->
                 assertThat(SPAN1)