tests/ztest: Swap native_posix with native_sim

Switch the default test platform to native_sim from native_posix

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

tests/ztest/base/testcase.yaml

@@ -6,11 +6,16 @@ tests:
     type: unit
   testing.ztest.base.cpp:
     extra_args: CONF_FILE=prj_cpp.conf
-    platform_allow: native_posix
+    platform_allow:
+      - native_posix
+      - native_sim
+      - native_sim_64
+    integration_platforms:
+      - native_sim
   testing.ztest.base.verbose_0:
     extra_args: CONF_FILE=prj_verbose_0.conf
     integration_platforms:
-      - native_posix
+      - native_sim
   testing.ztest.base.verbose_0_userspace:
     filter: CONFIG_USERSPACE
     extra_args: CONF_FILE=prj_verbose_0.conf
@@ -23,8 +28,8 @@ tests:
   testing.ztest.base.verbose_1:
     extra_args: CONF_FILE=prj_verbose_1.conf
     integration_platforms:
-      - native_posix
+      - native_sim
   testing.ztest.base.verbose_2:
     extra_args: CONF_FILE=prj_verbose_2.conf
     integration_platforms:
-      - native_posix
+      - native_sim

tests/ztest/zexpect/testcase.yaml

@@ -3,17 +3,15 @@
 
 common:
   integration_platforms:
-    - native_posix
+    - native_sim
   tags:
     - test_framework
 tests:
   testing.ztest.expect:
     integration_platforms:
-      - native_posix
+      - native_sim
   testing.ztest.expect_cpp:
     extra_configs:
       - CONFIG_CPLUSPLUS=y
-    integration_platforms:
-      - native_posix
   testing.ztest.expect.unit:
     type: unit