Add missing test for JarReader with trailing separator (#7929)

Author: smola

telemetry/src/test/groovy/datadog/telemetry/dependency/JarReaderSpecification.groovy

@@ -68,6 +68,25 @@ class JarReaderSpecification extends DepSpecification {
     result.manifest.getValue("Automatic-Module-Name") == "io.opentracing.util"
   }
 
+  void 'read nested jar with ending separator'() {
+    given:
+    String outerPath = getJar("spring-boot-app.jar").getAbsolutePath()
+    String jarPath = "$outerPath!/BOOT-INF/lib/opentracing-util-0.33.0.jar!/"
+
+    when:
+    def result = JarReader.readNestedJarFile(jarPath)
+
+    then:
+    result.jarName == "opentracing-util-0.33.0.jar"
+    result.pomProperties.size() == 1
+    def properties = result.pomProperties['META-INF/maven/io.opentracing/opentracing-util/pom.properties']
+    properties.groupId == "io.opentracing"
+    properties.artifactId == "opentracing-util"
+    properties.version == "0.33.0"
+    result.manifest != null
+    result.manifest.getValue("Automatic-Module-Name") == "io.opentracing.util"
+  }
+
   void 'non-existent simple jar'() {
     given:
     String jarPath = "non-existent.jar"