Test syntax for regression queries

Signed-off-by: kuba-- <[email protected]>

Author: kuba--

_testdata/regression.yml

@@ -1,3 +1,4 @@
+---
 -
   ID: 'query0'
   Name: 'All commits'
@@ -68,12 +69,12 @@
   ID: 'query12'
   Name: '10 top repos by file count in HEAD'
   Statements:
-    - SELECT repository_id, num_files FROM (SELECT COUNT(f.*) num_files, f.repository_id FROM ref_commits r INNER JOIN commit_files cf ON r.commit_hash = cf.commit_hash AND r.repository_id = cf.repository_id INNER JOIN files fON cf.repository_id = f.repository_id AND cf.blob_hash = f.blob_hash AND cf.tree_hash = f.tree_hash AND cf.file_path = f.file_path WHERE r.ref_name = 'HEAD' GROUP BY f.repository_id) t ORDER BY num_files DESC LIMIT 10
+    - SELECT repository_id, num_files FROM (SELECT COUNT(f.*) num_files, f.repository_id FROM ref_commits r INNER JOIN commit_files cf ON r.commit_hash = cf.commit_hash AND r.repository_id = cf.repository_id INNER JOIN files f ON cf.repository_id = f.repository_id AND cf.blob_hash = f.blob_hash AND cf.tree_hash = f.tree_hash AND cf.file_path = f.file_path WHERE r.ref_name = 'HEAD' GROUP BY f.repository_id) t ORDER BY num_files DESC LIMIT 10
 -
   ID: 'query13'
   Name: 'Top committers per repository'
   Statements:
-    - SELECT * FROM (SELECT commit_author_email as author,repository_id as id,count(*) as num_commits FROM commits GROUP BY commit_author_email, repository_id) t ORDER BY num_commits DESC"
+    - SELECT * FROM (SELECT commit_author_email as author, repository_id as id, count(*) as num_commits FROM commits GROUP BY commit_author_email, repository_id) AS t ORDER BY num_commits DESC
 -
   ID: 'query14'
   Name: 'Top committers in all repositories'

regression_test.go

@@ -0,0 +1,53 @@
+package gitbase_test
+
+import (
+	"context"
+	"io/ioutil"
+	"testing"
+
+	"github.com/src-d/gitbase"
+	"github.com/stretchr/testify/require"
+	"gopkg.in/src-d/go-mysql-server.v0/sql"
+	"gopkg.in/src-d/go-mysql-server.v0/sql/parse"
+	yaml "gopkg.in/yaml.v2"
+)
+
+type Query struct {
+	ID         string   `yaml:"ID"`
+	Name       string   `yaml:"Name,omitempty"`
+	Statements []string `yaml:"Statements"`
+}
+
+func TestParseRegressionQueries(t *testing.T) {
+	require := require.New(t)
+
+	queries, err := loadQueriesYaml("./_testdata/regression.yml")
+	require.NoError(err)
+
+	ctx := sql.NewContext(
+		context.TODO(),
+		sql.WithSession(gitbase.NewSession(gitbase.NewRepositoryPool())),
+	)
+
+	for _, q := range queries {
+		for _, stmt := range q.Statements {
+			if _, err := parse.Parse(ctx, stmt); err != nil {
+				require.Failf(err.Error(), "%v", q)
+			}
+		}
+	}
+}
+
+func loadQueriesYaml(file string) ([]Query, error) {
+	text, err := ioutil.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	var q []Query
+	err = yaml.Unmarshal(text, &q)
+	if err != nil {
+		return nil, err
+	}
+
+	return q, nil
+}