Mock OS and File.

1 files changed, 41 insertions, 0 deletions

diff --git a/db_test.go b/db_test.go
index 534bc3c..9c6ad85 100644
--- a/db_test.go
+++ b/db_test.go
@@ -8,13 +8,46 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+// Ensure that a database can be opened without error.
 func TestDBOpen(t *testing.T) {
 	withDB(func(db *DB, path string) {
 		err := db.Open(path, 0666)
 		assert.NoError(t, err)
+		assert.Equal(t, db.Path(), path)
 	})
 }
 
+// Ensure that the database returns an error if already open.
+func TestDBReopen(t *testing.T) {
+	withDB(func(db *DB, path string) {
+		db.Open(path, 0666)
+		err := db.Open(path, 0666)
+		assert.Equal(t, err, DatabaseAlreadyOpenedError)
+	})
+}
+
+// Ensure that the database returns an error if the file handle cannot be open.
+func TestDBOpenFileError(t *testing.T) {
+	withMockDB(func(db *DB, mockos *mockos, path string) {
+		exp := &os.PathError{}
+		mockos.On("OpenFile", path, os.O_RDWR|os.O_CREATE, os.FileMode(0666)).Return((*os.File)(nil), exp)
+		err := db.Open(path, 0666)
+		assert.Equal(t, err, exp)
+	})
+}
+
+// Ensure that the database returns an error if the meta file handle cannot be open.
+func TestDBOpenMetaFileError(t *testing.T) {
+	withMockDB(func(db *DB, mockos *mockos, path string) {
+		exp := &os.PathError{}
+		mockos.On("OpenFile", path, os.O_RDWR|os.O_CREATE, os.FileMode(0666)).Return(&os.File{}, nil)
+		mockos.On("OpenFile", path, os.O_RDWR|os.O_SYNC, os.FileMode(0666)).Return((*os.File)(nil), exp)
+		err := db.Open(path, 0666)
+		assert.Equal(t, err, exp)
+	})
+}
+
+// withDB executes a function with a database reference.
 func withDB(fn func(*DB, string)) {
 	f, _ := ioutil.TempFile("", "bolt-")
 	path := f.Name()
@@ -25,3 +58,11 @@ func withDB(fn func(*DB, string)) {
 	db := NewDB()
 	fn(db, path)
 }
+
+// withMockDB executes a function with a database reference and a mock filesystem.
+func withMockDB(fn func(*DB, *mockos, string)) {
+	os := &mockos{}
+	db := NewDB()
+	db.os = os
+	fn(db, os, "/mock/db")
+}