test(spanner): queries always return at least one partial result set (#…

…3305)

Queries will always return at least one partial result set containing the metadata
of the query, even if the query does not return any rows. That was not taken into
account in one of the test cases.

Fixes #3295

Co-authored-by: skuruppu <skuruppu@google.com>

spanner/read_test.go

@@ -929,6 +929,11 @@ func TestRsdBlockingStates(t *testing.T) {
 			name:         "unConnected -> queueingRetryable",
 			sql:          "SELECT t.key key, t.value value FROM t_mock t",
 			stateHistory: []resumableStreamDecoderState{queueingRetryable},
+			want: []*sppb.PartialResultSet{
+				{
+					Metadata: kvMeta,
+				},
+			},
 		},
 		{
 			// unConnected->queueingRetryable->queueingRetryable
@@ -1177,7 +1182,7 @@ func TestRsdBlockingStates(t *testing.T) {
 				mutex.Lock()
 				defer mutex.Unlock()
 				if !testEqual(rs, test.want) {
-					t.Fatalf("received PartialResultSets: \n%v\n, want \n%v\n", rs, test.want)
+					t.Fatalf("%s: received PartialResultSets: \n%v\n, want \n%v\n", test.name, rs, test.want)
 				}
 				// Verify that resumableStreamDecoder's internal buffering is also
 				// correct.