* sql: add catalog tests. (#79)

Author: smola

Diff for: sql/catalog_test.go

@@ -0,0 +1,50 @@
+package sql_test
+
+import (
+	"testing"
+
+	"github.com/gitql/gitql/mem"
+	"github.com/gitql/gitql/sql"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCatalog_Database(t *testing.T) {
+	assert := assert.New(t)
+
+	c := sql.Catalog{}
+	db, err := c.Database("foo")
+	assert.EqualError(err, "database not found: foo")
+	assert.Nil(db)
+
+	mydb := mem.NewDatabase("foo")
+	c.Databases = append(c.Databases, mydb)
+
+	db, err = c.Database("foo")
+	assert.NoError(err)
+	assert.Equal(mydb, db)
+}
+
+func TestCatalog_Table(t *testing.T) {
+	assert := assert.New(t)
+
+	c := sql.Catalog{}
+
+	table, err := c.Table("foo", "bar")
+	assert.EqualError(err, "database not found: foo")
+	assert.Nil(table)
+
+	mydb := mem.NewDatabase("foo")
+	c.Databases = append(c.Databases, mydb)
+
+	table, err = c.Table("foo", "bar")
+	assert.EqualError(err, "table not found: bar")
+	assert.Nil(table)
+
+	mytable := mem.NewTable("bar", sql.Schema{})
+	mydb.AddTable("bar", mytable)
+
+	table, err = c.Table("foo", "bar")
+	assert.NoError(err)
+	assert.Equal(mytable, table)
+}