unit tests: Use a unit test app partition table, configure spi_flash to use data partition

tools/unit-test-app/components/unity/test_utils.c

@@ -0,0 +1,25 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "unity.h"
+#include "test_utils.h"
+
+const esp_partition_t *get_test_data_partition()
+{
+    /* This user type/subtype (0x55) is set in
+       partition_table_unit_test_app.csv */
+    const esp_partition_t *result = esp_partition_find_first(0x55, 0x55, NULL);
+    TEST_ASSERT_NOT_NULL(result); /* means partition table set wrong */
+    return result;
+}