Use user name as default database when user is non-default

Not entirely backwards-compatible.

lib/connection-parameters.js

@@ -52,6 +52,11 @@ var ConnectionParameters = function (config) {
 
   this.user = val('user', config)
   this.database = val('database', config)
+
+  if (this.database === undefined) {
+    this.database = this.user
+  }
+
   this.port = parseInt(val('port', config), 10)
   this.host = val('host', config)
   this.password = val('password', config)

lib/defaults.js

@@ -15,7 +15,7 @@ module.exports = {
   user: process.platform === 'win32' ? process.env.USERNAME : process.env.USER,
 
   // name of database to connect
-  database: process.platform === 'win32' ? process.env.USERNAME : process.env.USER,
+  database: undefined,
 
   // database user's password
   password: null,

test/integration/client/configuration-tests.js

@@ -54,6 +54,26 @@ suite.test('modified values are passed to created clients', function () {
   })
 })
 
+suite.test('database defaults to user when user is non-default', () => {
+  {
+    const client = new Client({
+      user: 'foo',
+    })
+
+    assert.strictEqual(client.database, 'foo')
+  }
+
+  {
+    pg.defaults.database = 'bar'
+
+    const client = new Client({
+      user: 'foo',
+    })
+
+    assert.strictEqual(client.database, 'bar')
+  }
+})
+
 suite.test('cleanup', () => {
   // restore process.env
   for (var key in realEnv) {