add platformtest: infrastructure for ZFS compatiblity testing

platformtest/platformtest.go

@@ -0,0 +1,24 @@
+package platformtest
+
+import (
+	"context"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type Context struct {
+	context.Context
+	RootDataset string
+}
+
+var _ assert.TestingT = (*Context)(nil)
+var _ require.TestingT = (*Context)(nil)
+
+func (c *Context) Errorf(format string, args ...interface{}) {
+	getLog(c).Printf(format, args...)
+}
+
+func (c *Context) FailNow() {
+	panic(nil)
+}