diff --git a/api/all/build.gradle.kts b/api/all/build.gradle.kts
index 6ade72dfd88..ad6896387d8 100644
--- a/api/all/build.gradle.kts
+++ b/api/all/build.gradle.kts
@@ -1,7 +1,6 @@
 plugins {
   id("otel.java-conventions")
   id("otel.publish-conventions")
-  id("java-test-fixtures")
 
   id("otel.jmh-conventions")
   id("otel.animalsniffer-conventions")
@@ -16,12 +15,10 @@ dependencies {
 
   annotationProcessor("com.google.auto.value:auto-value")
 
+  testImplementation(project(":api:testing-internal"))
+
   testImplementation("edu.berkeley.cs.jqf:jqf-fuzz")
   testImplementation("com.google.guava:guava-testlib")
-  testFixturesApi(project(":testing-internal"))
-  testFixturesApi("junit:junit")
-  testFixturesApi("org.assertj:assertj-core")
-  testFixturesApi("org.mockito:mockito-core")
 }
 
 tasks.test {
diff --git a/api/all/src/test/java/io/opentelemetry/api/OpenTelemetryTest.java b/api/all/src/test/java/io/opentelemetry/api/OpenTelemetryTest.java
index c3754a6df3b..f985cffe2ed 100644
--- a/api/all/src/test/java/io/opentelemetry/api/OpenTelemetryTest.java
+++ b/api/all/src/test/java/io/opentelemetry/api/OpenTelemetryTest.java
@@ -7,6 +7,7 @@
 
 import io.opentelemetry.api.logs.LoggerProvider;
 import io.opentelemetry.api.metrics.MeterProvider;
+import io.opentelemetry.api.testing.internal.AbstractOpenTelemetryTest;
 import io.opentelemetry.api.trace.TracerProvider;
 
 class OpenTelemetryTest extends AbstractOpenTelemetryTest {
diff --git a/api/all/src/test/java/io/opentelemetry/api/logs/DefaultLoggerTest.java b/api/all/src/test/java/io/opentelemetry/api/logs/DefaultLoggerTest.java
index 436baee524c..10b43897a3e 100644
--- a/api/all/src/test/java/io/opentelemetry/api/logs/DefaultLoggerTest.java
+++ b/api/all/src/test/java/io/opentelemetry/api/logs/DefaultLoggerTest.java
@@ -5,6 +5,8 @@
 
 package io.opentelemetry.api.logs;
 
+import io.opentelemetry.api.testing.internal.AbstractDefaultLoggerTest;
+
 class DefaultLoggerTest extends AbstractDefaultLoggerTest {
 
   @Override
diff --git a/api/all/src/test/java/io/opentelemetry/api/metrics/DefaultMeterTest.java b/api/all/src/test/java/io/opentelemetry/api/metrics/DefaultMeterTest.java
index 1b012be1d55..69b32d5ecc0 100644
--- a/api/all/src/test/java/io/opentelemetry/api/metrics/DefaultMeterTest.java
+++ b/api/all/src/test/java/io/opentelemetry/api/metrics/DefaultMeterTest.java
@@ -5,6 +5,8 @@
 
 package io.opentelemetry.api.metrics;
 
+import io.opentelemetry.api.testing.internal.AbstractDefaultMeterTest;
+
 public class DefaultMeterTest extends AbstractDefaultMeterTest {
 
   @Override
diff --git a/api/all/src/test/java/io/opentelemetry/api/trace/DefaultTracerTest.java b/api/all/src/test/java/io/opentelemetry/api/trace/DefaultTracerTest.java
index f0f577d9946..b6736fa3843 100644
--- a/api/all/src/test/java/io/opentelemetry/api/trace/DefaultTracerTest.java
+++ b/api/all/src/test/java/io/opentelemetry/api/trace/DefaultTracerTest.java
@@ -5,6 +5,8 @@
 
 package io.opentelemetry.api.trace;
 
+import io.opentelemetry.api.testing.internal.AbstractDefaultTracerTest;
+
 class DefaultTracerTest extends AbstractDefaultTracerTest {
 
   @Override
diff --git a/api/incubator/build.gradle.kts b/api/incubator/build.gradle.kts
index b28295de6d0..bdf12950acf 100644
--- a/api/incubator/build.gradle.kts
+++ b/api/incubator/build.gradle.kts
@@ -15,7 +15,7 @@ dependencies {
   annotationProcessor("com.google.auto.value:auto-value")
 
   testImplementation(project(":sdk:testing"))
-  testImplementation(testFixtures(project(":api:all")))
+  testImplementation(project(":api:testing-internal"))
 
   testImplementation("io.opentelemetry.semconv:opentelemetry-semconv-incubating")
 
diff --git a/api/incubator/src/test/java/io/opentelemetry/api/incubator/ExtendedOpenTelemetryTest.java b/api/incubator/src/test/java/io/opentelemetry/api/incubator/ExtendedOpenTelemetryTest.java
index b33c29c8194..4903d00c2e6 100644
--- a/api/incubator/src/test/java/io/opentelemetry/api/incubator/ExtendedOpenTelemetryTest.java
+++ b/api/incubator/src/test/java/io/opentelemetry/api/incubator/ExtendedOpenTelemetryTest.java
@@ -7,7 +7,6 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import io.opentelemetry.api.AbstractOpenTelemetryTest;
 import io.opentelemetry.api.OpenTelemetry;
 import io.opentelemetry.api.incubator.logs.ExtendedDefaultLoggerProvider;
 import io.opentelemetry.api.incubator.logs.ExtendedLogger;
@@ -17,6 +16,7 @@
 import io.opentelemetry.api.incubator.trace.ExtendedTracer;
 import io.opentelemetry.api.logs.LoggerProvider;
 import io.opentelemetry.api.metrics.MeterProvider;
+import io.opentelemetry.api.testing.internal.AbstractOpenTelemetryTest;
 import io.opentelemetry.api.trace.TracerProvider;
 import io.opentelemetry.context.propagation.ContextPropagators;
 import org.junit.jupiter.api.Test;
diff --git a/api/incubator/src/test/java/io/opentelemetry/api/incubator/logs/ExtendedDefaultLoggerTest.java b/api/incubator/src/test/java/io/opentelemetry/api/incubator/logs/ExtendedDefaultLoggerTest.java
index e558b53fcf1..e92a3c160a6 100644
--- a/api/incubator/src/test/java/io/opentelemetry/api/incubator/logs/ExtendedDefaultLoggerTest.java
+++ b/api/incubator/src/test/java/io/opentelemetry/api/incubator/logs/ExtendedDefaultLoggerTest.java
@@ -8,9 +8,9 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import io.opentelemetry.api.common.Value;
-import io.opentelemetry.api.logs.AbstractDefaultLoggerTest;
 import io.opentelemetry.api.logs.Logger;
 import io.opentelemetry.api.logs.LoggerProvider;
+import io.opentelemetry.api.testing.internal.AbstractDefaultLoggerTest;
 import org.junit.jupiter.api.Test;
 
 class ExtendedDefaultLoggerTest extends AbstractDefaultLoggerTest {
diff --git a/api/incubator/src/test/java/io/opentelemetry/api/incubator/metrics/ExtendedDefaultMeterTest.java b/api/incubator/src/test/java/io/opentelemetry/api/incubator/metrics/ExtendedDefaultMeterTest.java
index 3d342a33661..a56a8740b04 100644
--- a/api/incubator/src/test/java/io/opentelemetry/api/incubator/metrics/ExtendedDefaultMeterTest.java
+++ b/api/incubator/src/test/java/io/opentelemetry/api/incubator/metrics/ExtendedDefaultMeterTest.java
@@ -8,9 +8,9 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import io.opentelemetry.api.OpenTelemetry;
-import io.opentelemetry.api.metrics.AbstractDefaultMeterTest;
 import io.opentelemetry.api.metrics.Meter;
 import io.opentelemetry.api.metrics.MeterProvider;
+import io.opentelemetry.api.testing.internal.AbstractDefaultMeterTest;
 import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.Test;
 
diff --git a/api/incubator/src/test/java/io/opentelemetry/api/incubator/trace/ExtendedDefaultTracerTest.java b/api/incubator/src/test/java/io/opentelemetry/api/incubator/trace/ExtendedDefaultTracerTest.java
index 1550796d42d..791c6b7d47c 100644
--- a/api/incubator/src/test/java/io/opentelemetry/api/incubator/trace/ExtendedDefaultTracerTest.java
+++ b/api/incubator/src/test/java/io/opentelemetry/api/incubator/trace/ExtendedDefaultTracerTest.java
@@ -8,7 +8,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import io.opentelemetry.api.OpenTelemetry;
-import io.opentelemetry.api.trace.AbstractDefaultTracerTest;
+import io.opentelemetry.api.testing.internal.AbstractDefaultTracerTest;
 import io.opentelemetry.api.trace.Tracer;
 import io.opentelemetry.api.trace.TracerProvider;
 import org.junit.jupiter.api.Test;
diff --git a/api/testing-internal/build.gradle.kts b/api/testing-internal/build.gradle.kts
new file mode 100644
index 00000000000..b3e79cf0cfe
--- /dev/null
+++ b/api/testing-internal/build.gradle.kts
@@ -0,0 +1,21 @@
+plugins {
+  id("otel.java-conventions")
+}
+
+description = "OpenTelemetry API Testing (Internal)"
+otelJava.moduleName.set("io.opentelemetry.api.testing.internal")
+
+dependencies {
+  api(project(":api:all"))
+
+  implementation(project(":testing-internal"))
+
+  implementation("com.linecorp.armeria:armeria-junit5")
+  implementation("org.assertj:assertj-core")
+  implementation("org.mockito:mockito-core")
+}
+
+// Skip OWASP dependencyCheck task on test module
+dependencyCheck {
+  skip = true
+}
diff --git a/api/all/src/testFixtures/java/io/opentelemetry/api/logs/AbstractDefaultLoggerTest.java b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultLoggerTest.java
similarity index 90%
rename from api/all/src/testFixtures/java/io/opentelemetry/api/logs/AbstractDefaultLoggerTest.java
rename to api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultLoggerTest.java
index 88ecb74809a..82d9f0b1f67 100644
--- a/api/all/src/testFixtures/java/io/opentelemetry/api/logs/AbstractDefaultLoggerTest.java
+++ b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultLoggerTest.java
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.api.logs;
+package io.opentelemetry.api.testing.internal;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
@@ -11,12 +11,15 @@
 import io.opentelemetry.api.common.AttributeKey;
 import io.opentelemetry.api.common.Attributes;
 import io.opentelemetry.api.common.Value;
+import io.opentelemetry.api.logs.Logger;
+import io.opentelemetry.api.logs.LoggerProvider;
+import io.opentelemetry.api.logs.Severity;
 import io.opentelemetry.context.Context;
 import java.time.Instant;
 import java.util.concurrent.TimeUnit;
 import org.junit.jupiter.api.Test;
 
-/** Unit tests for {@link DefaultLogger}. */
+/** Unit tests for No-op {@link Logger}. */
 public abstract class AbstractDefaultLoggerTest {
 
   protected abstract LoggerProvider getLoggerProvider();
diff --git a/api/all/src/testFixtures/java/io/opentelemetry/api/metrics/AbstractDefaultMeterTest.java b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultMeterTest.java
similarity index 90%
rename from api/all/src/testFixtures/java/io/opentelemetry/api/metrics/AbstractDefaultMeterTest.java
rename to api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultMeterTest.java
index b64c0929803..b96de557c42 100644
--- a/api/all/src/testFixtures/java/io/opentelemetry/api/metrics/AbstractDefaultMeterTest.java
+++ b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultMeterTest.java
@@ -3,16 +3,28 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.api.metrics;
+package io.opentelemetry.api.testing.internal;
 
 import static io.opentelemetry.api.common.AttributeKey.stringKey;
 
 import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.metrics.DoubleCounter;
+import io.opentelemetry.api.metrics.DoubleGauge;
+import io.opentelemetry.api.metrics.DoubleHistogram;
+import io.opentelemetry.api.metrics.DoubleUpDownCounter;
+import io.opentelemetry.api.metrics.LongCounter;
+import io.opentelemetry.api.metrics.LongGauge;
+import io.opentelemetry.api.metrics.LongHistogram;
+import io.opentelemetry.api.metrics.LongUpDownCounter;
+import io.opentelemetry.api.metrics.Meter;
+import io.opentelemetry.api.metrics.MeterProvider;
+import io.opentelemetry.api.metrics.ObservableDoubleMeasurement;
+import io.opentelemetry.api.metrics.ObservableLongMeasurement;
 import io.opentelemetry.context.Context;
 import io.opentelemetry.internal.testing.slf4j.SuppressLogger;
 import org.junit.jupiter.api.Test;
 
-/** Unit tests for {@link DefaultMeter}. */
+/** Unit tests for No-op {@link Meter}. */
 @SuppressLogger()
 public abstract class AbstractDefaultMeterTest {
   private final Meter meter = getMeter();
@@ -245,6 +257,7 @@ void noopObservableDoubleUpDownCounter_doesNotThrow() {
   }
 
   @Test
+  @SuppressWarnings("NullAway")
   void noopBatchCallback_doesNotThrow() {
     meter.batchCallback(() -> {}, null);
   }
diff --git a/api/all/src/testFixtures/java/io/opentelemetry/api/trace/AbstractDefaultTracerTest.java b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultTracerTest.java
similarity index 92%
rename from api/all/src/testFixtures/java/io/opentelemetry/api/trace/AbstractDefaultTracerTest.java
rename to api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultTracerTest.java
index 1933e289d5b..c90b7da21d9 100644
--- a/api/all/src/testFixtures/java/io/opentelemetry/api/trace/AbstractDefaultTracerTest.java
+++ b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractDefaultTracerTest.java
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.api.trace;
+package io.opentelemetry.api.testing.internal;
 
 import static io.opentelemetry.api.common.AttributeKey.stringKey;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -11,12 +11,19 @@
 
 import io.opentelemetry.api.common.AttributeKey;
 import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.trace.Span;
+import io.opentelemetry.api.trace.SpanBuilder;
+import io.opentelemetry.api.trace.SpanContext;
+import io.opentelemetry.api.trace.TraceFlags;
+import io.opentelemetry.api.trace.TraceState;
+import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.api.trace.TracerProvider;
 import io.opentelemetry.context.Context;
 import java.time.Instant;
 import java.util.concurrent.TimeUnit;
 import org.junit.jupiter.api.Test;
 
-/** Unit tests for {@link DefaultTracer}. */
+/** Unit tests for No-op {@link Tracer}. */
 // Need to suppress warnings for MustBeClosed because Android 14 does not support
 // try-with-resources.
 @SuppressWarnings("MustBeClosedChecker")
@@ -56,6 +63,7 @@ void defaultSpanBuilderWithName() {
   }
 
   @Test
+  @SuppressWarnings("NullAway")
   void spanContextPropagationExplicitParent() {
     assertThat(
             defaultTracer
@@ -109,6 +117,7 @@ void spanContextPropagation_fromContextThenNoParent() {
   }
 
   @Test
+  @SuppressWarnings("NullAway")
   void doNotCrash_NoopImplementation() {
     assertThatCode(
             () -> {
diff --git a/api/all/src/testFixtures/java/io/opentelemetry/api/AbstractOpenTelemetryTest.java b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractOpenTelemetryTest.java
similarity index 92%
rename from api/all/src/testFixtures/java/io/opentelemetry/api/AbstractOpenTelemetryTest.java
rename to api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractOpenTelemetryTest.java
index 6ba27d89760..4223d853661 100644
--- a/api/all/src/testFixtures/java/io/opentelemetry/api/AbstractOpenTelemetryTest.java
+++ b/api/testing-internal/src/main/java/io/opentelemetry/api/testing/internal/AbstractOpenTelemetryTest.java
@@ -3,11 +3,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.api;
+package io.opentelemetry.api.testing.internal;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
+import io.opentelemetry.api.GlobalOpenTelemetry;
+import io.opentelemetry.api.OpenTelemetry;
 import io.opentelemetry.api.logs.LoggerProvider;
 import io.opentelemetry.api.metrics.MeterProvider;
 import io.opentelemetry.api.trace.TracerProvider;
@@ -17,8 +19,9 @@
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
-/** Unit tests for {@link OpenTelemetry}. */
+/** Unit tests for No-op {@link OpenTelemetry}. */
 public abstract class AbstractOpenTelemetryTest {
+
   @BeforeAll
   public static void beforeClass() {
     GlobalOpenTelemetry.resetForTest();
@@ -96,7 +99,8 @@ void setThenSet() {
 
   @Test
   void getThenSet() {
-    assertThat(getGlobalOpenTelemetry()).isInstanceOf(DefaultOpenTelemetry.class);
+    assertThat(getGlobalOpenTelemetry().getClass().getName())
+        .isEqualTo("io.opentelemetry.api.DefaultOpenTelemetry");
     assertThatThrownBy(() -> GlobalOpenTelemetry.set(getOpenTelemetry()))
         .isInstanceOf(IllegalStateException.class)
         .hasMessageContaining("GlobalOpenTelemetry.set has already been called")
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 4bf7ca86538..12121e5094a 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -25,6 +25,7 @@ rootProject.name = "opentelemetry-java"
 include(":all")
 include(":api:all")
 include(":api:incubator")
+include(":api:testing-internal")
 include(":bom")
 include(":bom-alpha")
 include(":context")