test: add test of "cp" shell command

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
diff --git a/test/cmd/Makefile b/test/cmd/Makefile
index 7e40e25..478ef4c 100644
--- a/test/cmd/Makefile
+++ b/test/cmd/Makefile
@@ -19,6 +19,7 @@
 obj-$(CONFIG_CMD_HISTORY) += history.o
 obj-$(CONFIG_CMD_LOADM) += loadm.o
 obj-$(CONFIG_CMD_MEM_SEARCH) += mem_search.o
+obj-$(CONFIG_CMD_MEMORY) += mem_copy.o
 ifdef CONFIG_CMD_PCI
 obj-$(CONFIG_CMD_PCI_MPS) += pci_mps.o
 endif