Convert tooling tests to java (rest) (#14919)

Author: zeitlinger

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.
    *

javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/UtilsTest.groovy

@@ -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");
+  }
+}

javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/tooling/muzzle/HelperClassPredicateTest.groovy

@@ -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();
+  }
+}