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[Libguestfs] [PATCH 2/4] generator: Support testing the output of RHashtable functions.



From: "Richard W.M. Jones" <rjones redhat com>

You can use TestOutputHashtable to test the output of RHashtable
functions.
---
 generator/generator_capitests.ml |   38 ++++++++++++++++++++++++++++++++++++++
 generator/generator_types.ml     |    6 ++++++
 generator/generator_utils.ml     |    1 +
 3 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/generator/generator_capitests.ml b/generator/generator_capitests.ml
index 7bfd87c..f9cacf2 100644
--- a/generator/generator_capitests.ml
+++ b/generator/generator_capitests.ml
@@ -113,6 +113,22 @@ md5sum (const char *filename, char *result)
   result[32] = '\\0';
 }
 
+/* Return the value for a key in a hashtable.
+ * Note: the return value is part of the hash and should not be freed.
+ */
+static const char *
+get_key (char **hash, const char *key)
+{
+  size_t i;
+
+  for (i = 0; hash[i] != NULL; i += 2) {
+    if (STREQ (hash[i], key))
+      return hash[i+1];
+  }
+
+  return NULL; /* key not found */
+}
+
 ";
 
   (* Generate a list of commands which are not tested anywhere. *)
@@ -695,6 +711,28 @@ and generate_one_test_body name i test_name init test =
       in
       List.iter (generate_test_command_call test_name) seq;
       generate_test_command_call ~test test_name last
+  | TestOutputHashtable (seq, fields) ->
+      pr "  /* TestOutputHashtable for %s (%d) */\n" name i;
+      pr "  const char *key, *expected, *value;\n";
+      let seq, last = get_seq_last seq in
+      let test () =
+        List.iter (
+          fun (key, value) ->
+            pr "    key = \"%s\";\n" (c_quote key);
+            pr "    expected = \"%s\";\n" (c_quote value);
+            pr "    value = get_key (r, key);\n";
+            pr "    if (value == NULL) {\n";
+            pr "      fprintf (stderr, \"%s: key \\\"%%s\\\" not found in hash: expecting \\\"%%s\\\"\\n\", key, expected);\n" test_name;
+            pr "      return -1;\n";
+            pr "    }\n";
+            pr "    if (STRNEQ (value, expected)) {\n";
+            pr "      fprintf (stderr, \"%s: key \\\"%%s\\\": expected \\\"%%s\\\" but got \\\"%%s\\\"\\n\", key, expected, value);\n" test_name;
+            pr "      return -1;\n";
+            pr "    }\n";
+        ) fields
+      in
+      List.iter (generate_test_command_call test_name) seq;
+      generate_test_command_call ~test test_name last
   | TestLastFail seq ->
       pr "  /* TestLastFail for %s (%d) */\n" name i;
       let seq, last = get_seq_last seq in
diff --git a/generator/generator_types.ml b/generator/generator_types.ml
index 9da7e45..9459299 100644
--- a/generator/generator_types.ml
+++ b/generator/generator_types.ml
@@ -290,6 +290,12 @@ and test =
      *)
   | TestOutputDevice of seq * string
 
+    (* Run the command sequence and expect a hashtable.  Check
+     * one of more fields in the hashtable against known good
+     * strings.
+     *)
+  | TestOutputHashtable of seq * (string * string) list
+
   (* Run the command sequence and expect the final command (only)
    * to fail.
    *)
diff --git a/generator/generator_utils.ml b/generator/generator_utils.ml
index 4180c0d..aa7fcba 100644
--- a/generator/generator_utils.ml
+++ b/generator/generator_utils.ml
@@ -264,6 +264,7 @@ let seq_of_test = function
   | TestOutputStruct (s, _)
   | TestOutputFileMD5 (s, _)
   | TestOutputDevice (s, _)
+  | TestOutputHashtable (s, _)
   | TestLastFail s -> s
 
 let c_quote str =
-- 
1.7.6


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