+// A TestableVolume allows test suites to manipulate the state of an
+// underlying Volume, in order to test behavior in cases that are
+// impractical to achieve with a sequence of normal Volume operations.
+type TestableVolume interface {
+ Volume
+ // [Over]write content for a locator with the given data,
+ // bypassing all constraints like readonly and serialize.
+ PutRaw(locator string, data []byte)
+
+ // Specify the value Mtime() should return, until the next
+ // call to Touch, TouchWithDate, or Put.
+ TouchWithDate(locator string, lastPut time.Time)
+
+ // Clean up, delete temporary files.
+ Teardown()
+}
+