Add test triggering ForeachSubmodule panic.

submodule_test.go

@@ -0,0 +1,24 @@
+package git
+
+import (
+	"testing"
+)
+
+func TestSubmoduleForeach(t *testing.T) {
+	repo := createTestRepo(t)
+	seedTestRepo(t, repo)
+
+	_, err := repo.AddSubmodule("http://example.org/submodule", "submodule", true)
+	checkFatal(t, err)
+
+	i := 0
+	err = repo.ForeachSubmodule(func(sub *Submodule, name string) int {
+		i++
+		return 0
+	})
+	checkFatal(t, err)
+
+	if i != 1 {
+		t.Fatalf("expected one submodule found but got %i", i)
+	}
+}