1 files changed, 38 insertions, 0 deletions
diff --git a/librsync/helpers_test.go b/librsync/helpers_test.go
new file mode 100644
index 0000000..c12992f
--- /dev/null
+++ b/librsync/helpers_test.go
@@ -0,0 +1,38 @@
+package librsync
+
+import (
+	"bytes"
+	"github.com/kch42/golibrsync/librsync/testdata"
+	"testing"
+)
+
+func TestHelpers(t *testing.T) {
+	basis := bytes.NewReader(testdata.RandomData())
+	mutation := bytes.NewReader(testdata.Mutation())
+
+	delta := new(bytes.Buffer)
+	if err := InstantDelta(basis, mutation, delta); err != nil {
+		t.Fatalf("InstantDelta failed: %s", err)
+	}
+
+	if !bytes.Equal(delta.Bytes(), testdata.Delta()) {
+		if path, err := dump(delta); err == nil {
+			t.Fatalf("Deltas do not match. Generated delta dumped to %s", path)
+		} else {
+			t.Fatalf("Deltas do not match. Could not dump delta: %s", err)
+		}
+	}
+
+	newfile := new(bytes.Buffer)
+	if err := Patch(basis, delta, newfile); err != nil {
+		t.Fatalf("Patch failed: %s", err)
+	}
+
+	if !bytes.Equal(newfile.Bytes(), testdata.Mutation()) {
+		if path, err := dump(newfile); err == nil {
+			t.Fatalf("patch result and mutation are not equal. Result dumped to %s", path)
+		} else {
+			t.Fatalf("patch result and mutation are not equal. Could not dump result: %s", err)
+		}
+	}
+}