automatically create test database on first test execution

Makefile

@@ -5,12 +5,18 @@ build:
 clean:
 	node-waf clean
 
+db:
+	@if ! [ -f test/support/big.db ]; then                                     \
+		echo "Creating test database... This may take several minutes." ;      \
+		node test/support/createdb.js ;                                        \
+	fi
+
 ifndef only
-test: build
-	expresso -I lib test/*.test.js
+test: build db
+	@expresso -I lib test/*.test.js
 else
-test: build
-	expresso -I lib test/${only}.test.js
+test: build db
+	@expresso -I lib test/${only}.test.js
 endif
 
 .PHONY: build clean test
\ No newline at end of file

test/support/createdb.js

-#!/bin/sh
 var sqlite3 = require('../../lib/sqlite3');
 
 function randomString() {
@@ -10,13 +9,13 @@ function randomString() {
     return str;
 };
 
-var db = new sqlite3.Database('big.db');
+var db = new sqlite3.Database('test/support/big.db');
 
 var count = 10000000;
 
 db.serialize(function() {
     db.run("CREATE TABLE foo (id INT, txt TEXT)");
-    
+
     db.run("BEGIN TRANSACTION");
     var stmt = db.prepare("INSERT INTO foo VALUES(?, ?)");
     for (var i = 0; i < count; i++) {
@@ -24,5 +23,4 @@ db.serialize(function() {
     }
     stmt.finalize();
     db.run("COMMIT TRANSACTION");
-    
 });