Parse and add setup_hook and fields

This change allows updates to the dev structure for individual test
cases. This defines the "setup_hook" array, and "fields" map, at both
the test group level and at the individual test case level, with the
ones at the test case level overriding any parent level fields and/or
hooks.

The primary use case for this is to add new test definitions that would
not be setup correctly by the default infrastructure, such as testing
the LED function for the non-Pro X52, or setting up clock tests for
local timezone, etc.

lib/libx52/x52_test_gen.py

@@ -16,6 +16,7 @@ _TEST_FILE_HEADER = """/*
 #include <cmocka.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "x52_common.h"
 
@@ -116,6 +117,10 @@ class Test():
         self.name = group.name
         self.params_prefix = group.params_prefix
         self.params = obj["params"]
+        self.setup_hook = group.setup_hook + obj.get("setup_hook", [])
+        self.fields = group.fields.copy()
+        self.fields.update(obj.get("fields", {}))
+
         if len(self.params_prefix) < len(self.params):
             self.params_prefix.extend([''] * (len(self.params) - len(self.params_prefix)))
 
@@ -129,6 +134,16 @@ class Test():
     def print(self):
         print(_TEST_FUNCTION_HEADER.format(self.definition()))
 
+        if self.fields:
+            for arg, val in self.fields.items():
+                print("    dev->{} = {};".format(arg, val))
+
+        if self.setup_hook:
+            # Setup hook is an array of C commands that need to be executed
+            # prior to setting up the wrapper and running the tests
+            for hook in self.setup_hook:
+                print("    {}".format(hook))
+
         if self.output:
             print("    expect_function_calls(__wrap_libusb_control_transfer, {});".format(len(self.output)))
             print("    will_return_count(__wrap_libusb_control_transfer, LIBUSB_SUCCESS, {});".format(len(self.output)))
@@ -157,7 +172,8 @@ class TestGroup():
         """Load test cases from an object"""
         self.name = name
         self.function = obj["function"]
-        self.setup_hook = obj.get("setup_hook")
+        self.fields = obj.get("fields", {})
+        self.setup_hook = obj.get("setup_hook", [])
         self.params_prefix = obj.get("params_prefix", [])
         self.tests = []
         for test in obj["tests"]:

lib/libx52/x52_tests.json

@@ -225,6 +225,23 @@
             }
         ]
     },
+    "LED_nonPro": {
+        "_comment": [
+            "This suite checks if the LED state function returns not supported",
+            "when the device is an X52 (non-Pro) model"
+        ],
+        "function": "libx52_set_led_state",
+        "fields": {
+            "flags": "0"
+        },
+        "params_prefix": ["LIBX52_LED_", "LIBX52_LED_STATE_"],
+        "tests": [
+            {
+                "params": ["FIRE", "OFF"],
+                "retval": "NOT_SUPPORTED"
+            }
+        ]
+    },
     "MFD": {
         "function": "libx52_set_text",
         "tests": [