rewrite: Add tests for further ways to use the command

cmd/restic/integration_rewrite_test.go

@@ -5,23 +5,22 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
 )
 
-func testRunRewriteExclude(t testing.TB, gopts GlobalOptions, excludes []string) {
+func testRunRewriteExclude(t testing.TB, gopts GlobalOptions, excludes []string, forget bool) {
 	opts := RewriteOptions{
 		excludePatternOptions: excludePatternOptions{
 			Excludes: excludes,
 		},
+		Forget: forget,
 	}
 
 	rtest.OK(t, runRewrite(context.TODO(), opts, gopts, nil))
 }
 
-func TestRewrite(t *testing.T) {
-	env, cleanup := withTestEnvironment(t)
-	defer cleanup()
-
+func createBasicRewriteRepo(t testing.TB, env *testEnvironment) restic.ID {
 	testSetupBackupData(t, env)
 
 	// create backup
@@ -30,9 +29,45 @@ func TestRewrite(t *testing.T) {
 	rtest.Assert(t, len(snapshotIDs) == 1, "expected one snapshot, got %v", snapshotIDs)
 	testRunCheck(t, env.gopts)
 
+	return snapshotIDs[0]
+}
+
+func TestRewrite(t *testing.T) {
+	env, cleanup := withTestEnvironment(t)
+	defer cleanup()
+	createBasicRewriteRepo(t, env)
+
 	// exclude some data
-	testRunRewriteExclude(t, env.gopts, []string{"3"})
-	snapshotIDs = testRunList(t, "snapshots", env.gopts)
+	testRunRewriteExclude(t, env.gopts, []string{"3"}, false)
+	snapshotIDs := testRunList(t, "snapshots", env.gopts)
 	rtest.Assert(t, len(snapshotIDs) == 2, "expected two snapshots, got %v", snapshotIDs)
 	testRunCheck(t, env.gopts)
 }
+
+func TestRewriteUnchanged(t *testing.T) {
+	env, cleanup := withTestEnvironment(t)
+	defer cleanup()
+	snapshotID := createBasicRewriteRepo(t, env)
+
+	// use an exclude that will not exclude anything
+	testRunRewriteExclude(t, env.gopts, []string{"3dflkhjgdflhkjetrlkhjgfdlhkj"}, false)
+	newSnapshotIDs := testRunList(t, "snapshots", env.gopts)
+	rtest.Assert(t, len(newSnapshotIDs) == 1, "expected one snapshot, got %v", newSnapshotIDs)
+	rtest.Assert(t, snapshotID == newSnapshotIDs[0], "snapshot id changed unexpectedly")
+	testRunCheck(t, env.gopts)
+}
+
+func TestRewriteReplace(t *testing.T) {
+	env, cleanup := withTestEnvironment(t)
+	defer cleanup()
+	snapshotID := createBasicRewriteRepo(t, env)
+
+	// exclude some data
+	testRunRewriteExclude(t, env.gopts, []string{"3"}, true)
+	newSnapshotIDs := testRunList(t, "snapshots", env.gopts)
+	rtest.Assert(t, len(newSnapshotIDs) == 1, "expected one snapshot, got %v", newSnapshotIDs)
+	rtest.Assert(t, snapshotID != newSnapshotIDs[0], "snapshot id should have changed")
+	// check forbids unused blobs, thus remove them first
+	testRunPrune(t, env.gopts, PruneOptions{MaxUnused: "0"})
+	testRunCheck(t, env.gopts)
+}