test add_custom_tracer with strange input

Author: lavarou

tests/integration/api/add_custom_tracer/test_invalid_input.php

@@ -0,0 +1,98 @@
+<?php
+/*
+ * Copyright 2020 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*DESCRIPTION
+Test that adding custom tracers with strange names does not blow up.
+*/
+
+/*INI
+newrelic.code_level_metrics.enabled = true
+*/
+
+/*EXPECT
+zip
+zap
+*/
+
+/*EXPECT_METRICS_EXIST
+Custom/MY_function, 1
+Custom/MY_class::MY_method, 1
+Supportability/api/add_custom_tracer, 4
+*/
+
+/*EXPECT_SPAN_EVENTS_LIKE
+[
+    [
+      {
+        "category": "generic",
+        "type": "Span",
+        "guid": "??",
+        "traceId": "??",
+        "transactionId": "??",
+        "name": "Custom\/MY_function",
+        "timestamp": "??",
+        "duration": "??",
+        "priority": "??",
+        "sampled": true,
+        "parentId": "??"
+      },
+      {},
+      {
+        "code.lineno": "??",
+        "code.filepath": "__FILE__",
+        "code.function": "MY_function"
+      }
+    ],
+    [
+      {
+        "category": "generic",
+        "type": "Span",
+        "guid": "??",
+        "traceId": "??",
+        "transactionId": "??",
+        "name": "Custom\/MY_class::MY_method",
+        "timestamp": "??",
+        "duration": "??",
+        "priority": "??",
+        "sampled": true,
+        "parentId": "??"
+      },
+      {},
+      {
+        "code.lineno": "??",
+        "code.namespace": "MY_class",
+        "code.filepath": "__FILE__",
+        "code.function": "MY_method"
+      }
+    ]
+]
+*/
+
+/*EXPECT_TRACED_ERRORS null*/
+
+function MY_function($x) {
+    echo $x;
+}
+
+class MY_class {
+    public static function MY_method($x) {
+        echo $x;
+    }
+}
+
+/*
+ * Note that capitalization has been changed to test case insensitive lookup.
+ *
+ * Note that the metrics contain the capitalization of the actual code, not
+ * the parameters we are given.
+ */
+newrelic_add_custom_tracer("my_FUNCTION");
+newrelic_add_custom_tracer("my_CLASS::my_METHOD");
+newrelic_add_custom_tracer("$)O#()@::@)@)@@");
+newrelic_add_custom_tracer("a::b::c");
+
+MY_function("zip\n");
+MY_class::MY_method("zap\n");