1 files changed, 34 insertions, 0 deletions
diff --git a/patch_test.go b/patch_test.go
new file mode 100644
index 0000000..569eac2
--- /dev/null
+++ b/patch_test.go
@@ -0,0 +1,34 @@
+package git
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestPatch(t *testing.T) {
+	repo := createTestRepo(t)
+	defer repo.Free()
+	//defer os.RemoveAll(repo.Workdir())
+
+	_, originalTreeId := seedTestRepo(t, repo)
+	originalTree, err := repo.LookupTree(originalTreeId)
+
+	checkFatal(t, err)
+
+	_, newTreeId := updateReadme(t, repo, "file changed\n")
+
+	newTree, err := repo.LookupTree(newTreeId)
+	checkFatal(t, err)
+
+	diff, err := repo.DiffTreeToTree(originalTree, newTree, nil)
+	checkFatal(t, err)
+
+	patch, err := diff.Patch(0)
+	checkFatal(t, err)
+
+	patchStr, err := patch.String()
+	checkFatal(t, err)
+	if strings.Index(patchStr, "diff --git a/README b/README\nindex 257cc56..820734a 100644\n--- a/README\n+++ b/README\n@@ -1 +1 @@\n-foo\n+file changed") == -1 {
+		t.Fatalf("patch was bad")
+	}
+}