Add hasValueSatisfying to LongPointAssert and DoublePointAssert (#8328)

Author: trask

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+### SDK
+
+#### Testing
+
+* Add `hasValueSatisfying` to `LongPointAssert` and `DoublePointAssert` for fuzzy value matching
+
 ## Version 1.61.0 (2026-04-10)
 
 ### API

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

@@ -1,2 +1,7 @@
 Comparing source compatibility of opentelemetry-sdk-testing-1.62.0-SNAPSHOT.jar against opentelemetry-sdk-testing-1.61.0.jar
-No changes.
+***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.sdk.testing.assertj.DoublePointAssert  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.sdk.testing.assertj.DoublePointAssert hasValueSatisfying(java.util.function.Consumer<org.assertj.core.api.AbstractDoubleAssert<?>>)
+***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.sdk.testing.assertj.LongPointAssert  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) io.opentelemetry.sdk.testing.assertj.LongPointAssert hasValueSatisfying(java.util.function.Consumer<org.assertj.core.api.AbstractLongAssert<?>>)

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

@@ -12,6 +12,7 @@
 import java.util.Arrays;
 import java.util.function.Consumer;
 import javax.annotation.Nullable;
+import org.assertj.core.api.AbstractDoubleAssert;
 import org.assertj.core.api.Assertions;
 
 /**
@@ -33,6 +34,13 @@ public DoublePointAssert hasValue(double expected) {
     return this;
   }
 
+  /** Asserts the point's value satisfies the given assertion. */
+  public DoublePointAssert hasValueSatisfying(Consumer<AbstractDoubleAssert<?>> valueAssertion) {
+    isNotNull();
+    valueAssertion.accept(Assertions.assertThat(actual.getValue()).as("value"));
+    return this;
+  }
+
   /** Asserts the point has the specified exemplars, in any order. */
   public DoublePointAssert hasExemplars(DoubleExemplarData... exemplars) {
     isNotNull();

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

@@ -12,6 +12,7 @@
 import java.util.Arrays;
 import java.util.function.Consumer;
 import javax.annotation.Nullable;
+import org.assertj.core.api.AbstractLongAssert;
 
 /**
  * Assertions for an exported {@link LongPointData}.
@@ -31,6 +32,13 @@ public LongPointAssert hasValue(long expected) {
     return this;
   }
 
+  /** Asserts the point's value satisfies the given assertion. */
+  public LongPointAssert hasValueSatisfying(Consumer<AbstractLongAssert<?>> valueAssertion) {
+    isNotNull();
+    valueAssertion.accept(assertThat(actual.getValue()).as("value"));
+    return this;
+  }
+
   /** Asserts the point has the specified exemplars, in any order. */
   public LongPointAssert hasExemplars(LongExemplarData... exemplars) {
     isNotNull();

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

@@ -352,6 +352,7 @@ void doubleGauge() {
                             .hasEpochNanos(4)
                             .hasAttributes(Attributes.empty())
                             .hasValue(3.0)
+                            .hasValueSatisfying(val -> val.isEqualTo(3.0))
                             .hasExemplars(DOUBLE_EXEMPLAR2, DOUBLE_EXEMPLAR1)
                             .hasExemplarsSatisfying(
                                 exemplar ->
@@ -857,6 +858,7 @@ void longGauge() {
                     point ->
                         point
                             .hasValue(Long.MAX_VALUE)
+                            .hasValueSatisfying(val -> val.isEqualTo(Long.MAX_VALUE))
                             .hasExemplarsSatisfying(
                                 exemplar -> exemplar.hasValue(2),
                                 exemplar ->
@@ -903,6 +905,15 @@ void longGaugeFailure() {
                             gauge.hasPointsSatisfying(
                                 point -> point.hasValue(2), point -> point.hasValue(1))))
         .isInstanceOf(AssertionError.class);
+    assertThatThrownBy(
+            () ->
+                assertThat(LONG_GAUGE_METRIC)
+                    .hasLongGaugeSatisfying(
+                        gauge ->
+                            gauge.hasPointsSatisfying(
+                                point -> point.hasValueSatisfying(val -> val.isNegative()),
+                                point -> point.hasValueSatisfying(val -> val.isNegative()))))
+        .isInstanceOf(AssertionError.class);
     assertThatThrownBy(
             () ->
                 assertThat(LONG_GAUGE_METRIC)