diff --git a/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/Utils.java b/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/Utils.java
index 29c1b04a453d..6b8b95ccb73b 100644
--- a/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/Utils.java
+++ b/javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/Utils.java
@@ -41,16 +41,6 @@ public static String getResourceName(String className) {
     return className.replace('.', '/') + ".class";
   }
 
-  /** com/foo/Bar to com.foo.Bar */
-  public static String getClassName(String internalName) {
-    return internalName.replace('/', '.');
-  }
-
-  /** com.foo.Bar to com/foo/Bar */
-  public static String getInternalName(Class<?> clazz) {
-    return clazz.getName().replace('.', '/');
-  }
-
   /**
    * Get method definition for given {@link TypeDefinition} and method name.
    *
diff --git a/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/UtilsTest.groovy b/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/UtilsTest.groovy
deleted file mode 100644
index 05c2cd50f50a..000000000000
--- a/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/UtilsTest.groovy
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright The OpenTelemetry Authors
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package io.opentelemetry.javaagent.tooling
-
-import spock.lang.Specification
-
-class UtilsTest extends Specification {
-
-  def "getResourceName() adds suffix and converts dots to slashes"() {
-    setup:
-    def result = Utils.getResourceName("com.example.Something")
-    expect:
-    result == "com/example/Something.class"
-  }
-
-  def "getClassName() converts slashes to dots"() {
-    setup:
-    def result = Utils.getClassName("com/example/Something")
-    expect:
-    result == "com.example.Something"
-  }
-
-  def "getInternalName() converts slashes to dots"() {
-    setup:
-    def result = Utils.getInternalName(UtilsTest)
-    expect:
-    result == "io/opentelemetry/javaagent/tooling/UtilsTest"
-  }
-
-}
diff --git a/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.groovy b/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.groovy
deleted file mode 100644
index 9d325421691a..000000000000
--- a/javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.groovy
+++ /dev/null
@@ -1,42 +0,0 @@
-/*
- * Copyright The OpenTelemetry Authors
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package io.opentelemetry.javaagent.tooling.muzzle
-
-import spock.lang.Specification
-import spock.lang.Unroll
-
-class HelperClassPredicateTest extends Specification {
-  @Unroll
-  def "should collect references for #desc"() {
-    setup:
-    def predicate = new HelperClassPredicate({ it.startsWith("com.example.instrumentation.library") })
-
-    expect:
-    predicate.isHelperClass(className)
-
-    where:
-    desc                                       | className
-    "javaagent instrumentation class"          | "io.opentelemetry.javaagent.instrumentation.some_instrumentation.Advice"
-    "library instrumentation class"            | "io.opentelemetry.instrumentation.LibraryClass"
-    "additional library instrumentation class" | "com.example.instrumentation.library.ThirdPartyExternalInstrumentation"
-  }
-
-  @Unroll
-  def "should not collect references for #desc"() {
-    setup:
-    def predicate = new HelperClassPredicate({ false })
-
-    expect:
-    !predicate.isHelperClass(className)
-
-    where:
-    desc                                  | className
-    "Java SDK class"                      | "java.util.ArrayList"
-    "javaagent-tooling class"             | "io.opentelemetry.javaagent.tooling.Constants"
-    "instrumentation-api class"           | "io.opentelemetry.instrumentation.api.InstrumentationVersion"
-    "bootstrap class"                     | "io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge"
-  }
-}
diff --git a/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/UtilsTest.java b/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/UtilsTest.java
new file mode 100644
index 000000000000..e004a209c9cb
--- /dev/null
+++ b/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/UtilsTest.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.tooling;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class UtilsTest {
+
+  @Test
+  void getResourceNameAddsSuffixAndConvertDotsToSlashes() {
+    String result = Utils.getResourceName("com.example.Something");
+
+    assertThat(result).isEqualTo("com/example/Something.class");
+  }
+}
diff --git a/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.java b/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.java
new file mode 100644
index 000000000000..1464df66a9c0
--- /dev/null
+++ b/javaagent-tooling/src/test/java/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.tooling.muzzle;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.function.Predicate;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class HelperClassPredicateTest {
+
+  @ParameterizedTest(name = "should collect references for {0}")
+  @CsvSource({
+    "javaagent instrumentation class, io.opentelemetry.javaagent.instrumentation.some_instrumentation.Advice",
+    "library instrumentation class, io.opentelemetry.instrumentation.LibraryClass",
+    "additional library instrumentation class, com.example.instrumentation.library.ThirdPartyExternalInstrumentation"
+  })
+  void shouldCollectReferencesFor(String desc, String className) {
+    Predicate<String> additionalLibraryPredicate =
+        name -> name.startsWith("com.example.instrumentation.library");
+    HelperClassPredicate predicate = new HelperClassPredicate(additionalLibraryPredicate);
+
+    assertThat(predicate.isHelperClass(className)).isTrue();
+  }
+
+  @ParameterizedTest(name = "should not collect references for {0}")
+  @CsvSource({
+    "Java SDK class, java.util.ArrayList",
+    "javaagent-tooling class, io.opentelemetry.javaagent.tooling.Constants",
+    "instrumentation-api class, io.opentelemetry.instrumentation.api.instrumenter.Instrumenter",
+    "bootstrap class, io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge"
+  })
+  void shouldNotCollectReferencesFor(String desc, String className) {
+    Predicate<String> alwaysFalsePredicate = name -> false;
+    HelperClassPredicate predicate = new HelperClassPredicate(alwaysFalsePredicate);
+
+    assertThat(predicate.isHelperClass(className)).isFalse();
+  }
+}