Fix mojo_public_system_unittests CoreTest.MinimalCTest.

mojo/public/c/system/tests/core_unittest_pure_c.c

Index: mojo/public/c/system/tests/core_unittest_pure_c.c
diff --git a/mojo/public/c/system/tests/core_unittest_pure_c.c b/mojo/public/c/system/tests/core_unittest_pure_c.c
index 46969347664646fe81097f10343504b53d9ce5ce..bb00927c3b664870b6c36daa4b1b5fa59d4178f6 100644
--- a/mojo/public/c/system/tests/core_unittest_pure_c.c
+++ b/mojo/public/c/system/tests/core_unittest_pure_c.c
@@ -61,14 +61,17 @@ const char* MinimalCTest(void) {
   EXPECT_EQ(MOJO_RESULT_OK, MojoCreateMessagePipe(NULL, &handle0, &handle1));
 
   signals = MOJO_HANDLE_SIGNAL_READABLE;
-  uint32_t result_index = 1;
+  uint32_t result_index = 123;
   struct MojoHandleSignalsState states[1];
   EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED,
             MojoNewWaitMany(&handle0, &signals, 1, 1, &result_index, states));
 
-  EXPECT_EQ(0u, result_index);
+  // "Deadline exceeded" doesn't apply to a single handle, so this should leave
+  // |result_index| untouched.
+  EXPECT_EQ(123u, result_index);
   EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, states[0].satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE,
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+            MOJO_HANDLE_SIGNAL_PEER_CLOSED,
             states[0].satisfiable_signals);
 
   EXPECT_EQ(MOJO_RESULT_OK,
@@ -87,7 +90,8 @@ const char* MinimalCTest(void) {
 
   EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE,
             state.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE,
+  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE |
+            MOJO_HANDLE_SIGNAL_PEER_CLOSED,
             state.satisfiable_signals);
 
   num_bytes = (uint32_t)sizeof(buffer);