fix windows tests (#421)

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>

repair_test.go

@@ -2,6 +2,7 @@ package tsdb
 
 import (
 	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/prometheus/tsdb/chunks"
@@ -45,9 +46,9 @@ func TestRepairBadIndexVersion(t *testing.T) {
 	// 		panic(err)
 	// 	}
 	// }
-	const dbDir = "testdata/repair_index_version/01BZJ9WJQPWHGNC2W4J9TA62KC"
-	tmpDir := "testdata/repair_index_version/copy"
-	tmpDbDir := tmpDir + "/3MCNSQ8S31EHGJYWK5E1GPJWJZ"
+	dbDir := filepath.Join("testdata", "repair_index_version", "01BZJ9WJQPWHGNC2W4J9TA62KC")
+	tmpDir := filepath.Join("testdata", "repair_index_version", "copy")
+	tmpDbDir := filepath.Join(tmpDir, "3MCNSQ8S31EHGJYWK5E1GPJWJZ")
 
 	// Check the current db.
 	// In its current state, lookups should fail with the fixed code.
@@ -55,10 +56,10 @@ func TestRepairBadIndexVersion(t *testing.T) {
 	testutil.NotOk(t, err)
 
 	// Touch chunks dir in block.
-	os.MkdirAll(dbDir+"/chunks", 0777)
-	defer os.RemoveAll(dbDir + "/chunks")
+	os.MkdirAll(filepath.Join(dbDir, "chunks"), 0777)
+	defer os.RemoveAll(filepath.Join(dbDir, "chunks"))
 
-	r, err := index.NewFileReader(dbDir + "/index")
+	r, err := index.NewFileReader(filepath.Join(dbDir, "index"))
 	testutil.Ok(t, err)
 	p, err := r.Postings("b", "1")
 	testutil.Ok(t, err)
@@ -81,7 +82,7 @@ func TestRepairBadIndexVersion(t *testing.T) {
 	testutil.Ok(t, err)
 	db.Close()
 
-	r, err = index.NewFileReader(tmpDbDir + "/index")
+	r, err = index.NewFileReader(filepath.Join(tmpDbDir, "index"))
 	testutil.Ok(t, err)
 	p, err = r.Postings("b", "1")
 	testutil.Ok(t, err)