move implementation to internal/ directory (#828)

internal/platformtest/tests/tests.go

@@ -0,0 +1,16 @@
+package tests
+
+import (
+	"reflect"
+	"runtime"
+
+	"github.com/zrepl/zrepl/internal/platformtest"
+)
+
+type Case func(*platformtest.Context)
+
+func (c Case) String() string {
+	return runtime.FuncForPC(reflect.ValueOf(c).Pointer()).Name()
+}
+
+//go:generate go run ./gen github.com/zrepl/zrepl/platformtest/tests