wallet: Add wallet_tests and simplify db_tests

I'll eventually move the utils into a different location (maybe CCAN?)
but for now I'm keeping it close to where it is used.

wallet/db_tests.c

@@ -1,5 +1,7 @@
 #include "db.c"
 
+#include "wallet/test_utils.h"
+
 #include <stdio.h>
 #include <unistd.h>
 
@@ -20,24 +22,13 @@ static struct db *create_test_db(const char *testname)
 static bool test_empty_db_migrate(void)
 {
 	struct db *db = create_test_db(__func__);
-	if (!db)
-		goto fail;
-
-	if (db_get_version(db) != -1)
-		goto fail;
-
-	if (!db_migrate(db))
-		goto fail;
-
-	if (db_get_version(db) != db_migration_count())
-		goto fail;
+	CHECK(db);
+	CHECK(db_get_version(db) == -1);
+	CHECK(db_migrate(db));
+	CHECK(db_get_version(db) == db_migration_count());
 
 	tal_free(db);
 	return true;
-fail:
-	printf("Migration failed with error: %s\n", db->err);
-	tal_free(db);
-	return false;
 }
 
 int main(void)

wallet/test_utils.h

@@ -0,0 +1,24 @@
+#ifndef LIGHTNING_WALLET_TEST_UTILS_H
+#define LIGHTNING_WALLET_TEST_UTILS_H
+
+/* Definitions "inspired" by libsecp256k1 */
+#define TEST_FAILURE(msg) do { \
+    fprintf(stderr, "%s:%d: %s\n", __FILE__, __LINE__, msg); \
+    return false; \
+} while(0)
+
+#ifdef HAVE_BUILTIN_EXPECT
+#define EXPECT(x,c) __builtin_expect((x),(c))
+#else
+#define EXPECT(x,c) (x)
+#endif
+
+#define CHECK_MSG(cond,msg) do {      \
+    if (EXPECT(!(cond), 0)) { \
+        TEST_FAILURE(msg); \
+    } \
+} while(0)
+
+#define CHECK(cond) CHECK_MSG(cond,"test condition failed");
+
+#endif /* LIGHTNING_WALLET_TEST_UTILS_H */

wallet/wallet_tests.c

@@ -0,0 +1,41 @@
+#include "wallet.c"
+
+#include "db.c"
+#include "wallet/test_utils.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+static bool test_wallet_add_utxo(void)
+{
+	char filename[] = "/tmp/ldb-XXXXXX";
+	struct utxo u;
+	int fd = mkstemp(filename);
+	struct wallet *w = tal(NULL, struct wallet);
+	CHECK_MSG(fd != -1, "Unable to generate temp filename");
+	close(fd);
+
+	w->db = db_open(w, filename);
+	CHECK_MSG(w->db,"Failed opening the db");
+	CHECK_MSG(db_migrate(w->db), "DB migration failed");
+		
+	memset(&u, 0, sizeof(u));
+
+	/* Should work, it's the first time we add it */
+	CHECK_MSG(wallet_add_utxo(w, &u, p2sh_wpkh), "wallet_add_utxo failed on first add");
+
+	/* Should fail, we already have that UTXO */
+	CHECK_MSG(!wallet_add_utxo(w, &u, p2sh_wpkh), "wallet_add_utxo succeeded on second add");
+	tal_free(w);
+	return true;
+
+}
+
+int main(void)
+{
+	bool ok = true;
+
+	ok &= test_wallet_add_utxo();
+
+	return !ok;
+}