Add unit test to validate that when creating a string response in json,
that characters such as \n or quotes are properly escaped.

Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
---
 app/test/test_telemetry_json.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/app/test/test_telemetry_json.c b/app/test/test_telemetry_json.c
index 748b7cfe5a..955c2e5b1b 100644
--- a/app/test/test_telemetry_json.c
+++ b/app/test/test_telemetry_json.c
@@ -125,6 +125,22 @@ test_large_obj_element(void)
        return strncmp(expected, buf, sizeof(buf));
 }
 
+static int
+test_string_char_escaping(void)
+{
+       static const char str[] = "A string across\ntwo lines and \"with 
quotes\"!";
+       const char *expected = "\"A string across\\ntwo lines and \\\"with 
quotes\\\"!\"";
+       char buf[sizeof(str) + 10];
+       int used = 0;
+
+       used = rte_tel_json_str(buf, sizeof(buf), used, str);
+       printf("%s: buf = '%s', expected = '%s'\n", __func__, buf, expected);
+       if (used != (int)strlen(expected))
+               return -1;
+
+       return strncmp(expected, buf, sizeof(buf));
+}
+
 typedef int (*test_fn)(void);
 
 static int
@@ -138,6 +154,7 @@ test_telemetry_json(void)
                        test_overflow_obj,
                        test_large_array_element,
                        test_large_obj_element,
+                       test_string_char_escaping,
        };
        for (i = 0; i < RTE_DIM(fns); i++)
                if (fns[i]() == 0)
-- 
2.34.1

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