Add tests for Utils.getStackTraceAsString()

Author: labbati

dd-java-agent/agent-tooling/src/main/java/datadog/trace/agent/tooling/Utils.java

@@ -84,6 +84,9 @@ public static MethodDescription getMethodDefinition(
     return type.getDeclaredMethods().filter(named(methodName)).getOnly();
   }
 
+  /**
+   * @return The current stack trace with multiple entries on new lines.
+   */
   public static String getStackTraceAsString() {
     StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
     StringBuilder stringBuilder = new StringBuilder();

dd-java-agent/agent-tooling/src/test/groovy/datadog/trace/agent/tooling/UtilsTest.groovy

@@ -0,0 +1,16 @@
+package datadog.trace.agent.tooling
+
+import spock.lang.Specification
+
+
+class UtilsTest extends Specification {
+
+  def "getStackTraceAsString() returns the stack trace as a single new line separated string"() {
+    setup:
+    def stackTrace = Utils.stackTraceAsString
+
+    expect:
+    stackTrace.contains('datadog.trace.agent.tooling.Utils')
+    stackTrace.contains(System.getProperty("line.separator"))
+  }
+}