Implement DatasetMapping + basic ZFS list functionality.

zfs/zfs_test.go

@@ -0,0 +1,21 @@
+package zfs
+
+import (
+	"testing"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestZFSListHandlesProducesZFSErrorOnNonZeroExit(t *testing.T) {
+	var err error
+
+	ZFS_BINARY = "./test_helpers/zfs_failer.sh"
+
+	_, err = zfsList("nonexistent/dataset", func(p DatasetPath) bool {
+		return true
+	})
+
+	assert.Error(t, err)
+	zfsError, ok := err.(ZFSError)
+	assert.True(t, ok)
+	assert.Equal(t, "error: this is a mock\n", string(zfsError.Stderr))
+}