A simple test infrastructure -- idea stolen from Gaurav.

src/platform/vboot_reference/cgptlib/cgpt.c

Index: src/platform/vboot_reference/cgptlib/cgpt.c
diff --git a/src/platform/vboot_reference/cgptlib/cgpt.c b/src/platform/vboot_reference/cgptlib/cgpt.c
index 7f18a1cf8d45b6bc2a925592acdf1a5f7a04e69d..4504a618a548a5c109bd7aae2d7b7d5431959565 100644
--- a/src/platform/vboot_reference/cgptlib/cgpt.c
+++ b/src/platform/vboot_reference/cgptlib/cgpt.c
@@ -9,19 +9,19 @@
 static int start[] = { 34, 10034 };
 
 int GPTInit(GPTData_t *gpt) {
-        gpt->current_kernel = 1;
-        return 0;
+  gpt->current_kernel = 1;
+  return 0;
 }
 
 int GPTNextKernelEntry(GPTData_t *gpt, uint64_t *start_sector, uint64_t *size) {
-        gpt->current_kernel ^= 1;
-        if (start_sector) *start_sector = start[gpt->current_kernel];
-        if (size) *size = 10000;
-        return 0;
+  gpt->current_kernel ^= 1;
+  if (start_sector) *start_sector = start[gpt->current_kernel];
+  if (size) *size = 10000;
+  return 0;
 }
 
 int GPTUpdateKernelEntry(GPTData_t *gpt, uint32_t update_type) {
-        gpt->modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1) <<
-                         gpt->current_kernel;
-        return 0;
+  gpt->modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1) <<
+                   gpt->current_kernel;
+  return 0;
 }