[arch][test] add a new unittest for the arch mmu code

Just a skeleton at the moment, simply creates an arch aspace
and destroys it.

arch/test/mmu.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2020 Travis Geiselbrecht
+ *
+ * Use of this source code is governed by a MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT
+ */
+#if ARCH_HAS_MMU
+
+#include <arch/mmu.h>
+
+#include <lk/err.h>
+#include <lib/unittest.h>
+#include <kernel/vm.h>
+
+static bool create_user_aspace(void) {
+    BEGIN_TEST;
+
+    arch_aspace_t as;
+    status_t err = arch_mmu_init_aspace(&as, USER_ASPACE_BASE, USER_ASPACE_SIZE, 0);
+    EXPECT_EQ(NO_ERROR, err, "init");
+
+    err = arch_mmu_destroy_aspace(&as);
+    EXPECT_EQ(NO_ERROR, err, "destroy");
+
+    END_TEST;
+}
+
+BEGIN_TEST_CASE(arch_mmu_tests)
+RUN_TEST(create_user_aspace);
+END_TEST_CASE(arch_mmu_tests)
+
+#endif // ARCH_HAS_MMU

arch/test/rules.mk

@@ -0,0 +1,10 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS := $(LOCAL_DIR)/mmu.c
+
+MODULE_DEPS := lib/unittest
+
+include make/module.mk
+

project/virtual/test.mk

@@ -4,6 +4,7 @@ MODULES += \
   app/shell \
   app/stringtests \
   app/tests \
+  arch/test \
   lib/aes \
   lib/aes/test \
   lib/cksum \