Simplify mock service Close (#30)

Author: kelindar

mock/service.go

@@ -99,3 +99,14 @@ func containsAll(have, want []uint32) bool {
 	}
 	return true
 }
+
+// Close resets the buffer and releases any held resources.
+func (s *Service) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.buf = nil
+	s.next = 0
+	s.size = 0
+	s.capacity = 0
+	return nil
+}

mock/service_test.go

@@ -47,3 +47,15 @@ func TestServiceQueryIntersection(t *testing.T) {
 	}
 	assert.Equal(t, []string{"b"}, res)
 }
+
+func TestServiceCloseResets(t *testing.T) {
+	svc := NewService(2)
+	svc.Log("pending", 1)
+
+	err := svc.Close()
+	assert.NoError(t, err)
+	assert.Equal(t, 0, svc.capacity)
+	assert.Nil(t, svc.buf)
+	assert.Zero(t, svc.size)
+	assert.Zero(t, svc.next)
+}