diff --git a/tests/posix/env/CMakeLists.txt b/tests/posix/env/CMakeLists.txt
deleted file mode 100644
index 6cd1e565dcc6..000000000000
--- a/tests/posix/env/CMakeLists.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-cmake_minimum_required(VERSION 3.20.0)
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(posix_common)
-
-FILE(GLOB app_sources src/*.c)
-
-target_sources(app PRIVATE ${app_sources})
-# For setenv() and unsetenv()
-target_compile_options(app PRIVATE -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)
-# For getenv_r() visibility and testing
-target_compile_definitions(app PRIVATE _BSD_SOURCE)
diff --git a/tests/posix/env/prj.conf b/tests/posix/env/prj.conf
deleted file mode 100644
index fcf68903a722..000000000000
--- a/tests/posix/env/prj.conf
+++ /dev/null
@@ -1,6 +0,0 @@
-CONFIG_ZTEST=y
-CONFIG_POSIX_SINGLE_PROCESS=y
-# Let's explicitly choose PICOLIBC, so it is used if supported even if it would not have been the
-# default (otherwise native targets default to the host C library)
-CONFIG_PICOLIBC=y
-CONFIG_COMMON_LIBC_MALLOC=y
diff --git a/tests/posix/env/testcase.yaml b/tests/posix/env/testcase.yaml
deleted file mode 100644
index b347479976c9..000000000000
--- a/tests/posix/env/testcase.yaml
+++ /dev/null
@@ -1,32 +0,0 @@
-common:
-  filter: not CONFIG_NATIVE_LIBC
-  integration_platforms:
-    - qemu_riscv64
-  tags: posix
-tests:
-  portability.posix.env:
-    extra_configs:
-      - CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
-  portability.posix.env.armclang_std_libc:
-    toolchain_allow: armclang
-    extra_configs:
-      - CONFIG_ARMCLANG_STD_LIBC=y
-  portability.posix.env.arcmwdtlib:
-    toolchain_allow: arcmwdt
-    extra_configs:
-      - CONFIG_ARCMWDT_LIBC=y
-  portability.posix.env.minimal:
-    extra_configs:
-      - CONFIG_MINIMAL_LIBC=y
-      - CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
-  portability.posix.env.newlib:
-    platform_exclude:
-      - hifive1
-    filter: TOOLCHAIN_HAS_NEWLIB == 1
-    extra_configs:
-      - CONFIG_NEWLIB_LIBC=y
-  portability.posix.env.picolibc:
-    tags: picolibc
-    filter: CONFIG_PICOLIBC_SUPPORTED
-    extra_configs:
-      - CONFIG_PICOLIBC=y
diff --git a/tests/posix/single_process/CMakeLists.txt b/tests/posix/single_process/CMakeLists.txt
index b7f056b2bbc3..a8cfbed34437 100644
--- a/tests/posix/single_process/CMakeLists.txt
+++ b/tests/posix/single_process/CMakeLists.txt
@@ -8,4 +8,7 @@ FILE(GLOB app_sources src/*.c)
 
 target_sources(app PRIVATE ${app_sources})
 
+# For setenv() and unsetenv()
 target_compile_options(app PRIVATE -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)
+# For getenv_r() visibility and testing
+target_compile_definitions(app PRIVATE _BSD_SOURCE)
diff --git a/tests/posix/single_process/prj.conf b/tests/posix/single_process/prj.conf
index 472780a18063..7422432b9d0b 100644
--- a/tests/posix/single_process/prj.conf
+++ b/tests/posix/single_process/prj.conf
@@ -1,5 +1,7 @@
-CONFIG_POSIX_API=y
 CONFIG_ZTEST=y
-
-CONFIG_POSIX_AEP_CHOICE_BASE=y
 CONFIG_POSIX_SINGLE_PROCESS=y
+
+# Let's explicitly choose PICOLIBC, so it is used if supported even if it would not have been the
+# default (otherwise native targets default to the host C library)
+CONFIG_PICOLIBC=y
+CONFIG_COMMON_LIBC_MALLOC=y
diff --git a/tests/posix/single_process/src/confstr.c b/tests/posix/single_process/src/confstr.c
index f11ccf1ba89a..1dd9ad1434f3 100644
--- a/tests/posix/single_process/src/confstr.c
+++ b/tests/posix/single_process/src/confstr.c
@@ -5,9 +5,9 @@
  */
 
 #include <errno.h>
-#include <unistd.h>
 
 #include <zephyr/ztest.h>
+#include <zephyr/posix/unistd.h>
 #include <zephyr/sys/util.h>
 
 ZTEST(posix_single_process, test_confstr)
diff --git a/tests/posix/env/src/env.c b/tests/posix/single_process/src/env.c
similarity index 93%
rename from tests/posix/env/src/env.c
rename to tests/posix/single_process/src/env.c
index 1d121a244388..ebe19b752280 100644
--- a/tests/posix/env/src/env.c
+++ b/tests/posix/single_process/src/env.c
@@ -33,7 +33,7 @@ static DEFINE_ENVIRON(pwd, "PWD", M_PWD);
 
 static char *environ_for_test[] = {home, uid, pwd, NULL};
 
-ZTEST(env, test_getenv)
+ZTEST(posix_single_process, test_getenv)
 {
 	zassert_equal(getenv(NULL), NULL);
 	zassert_equal(getenv(""), NULL);
@@ -46,7 +46,7 @@ ZTEST(env, test_getenv)
 	zassert_mem_equal(getenv("PWD"), M_PWD, strlen(M_PWD) + 1);
 }
 
-ZTEST(env, test_getenv_r)
+ZTEST(posix_single_process, test_getenv_r)
 {
 	static char buf[16];
 	static const int exp_errno[] = {
@@ -74,8 +74,7 @@ ZTEST(env, test_getenv_r)
 
 	BUILD_ASSERT(ARRAY_SIZE(exp_errno) == ARRAY_SIZE(args));
 
-	ARRAY_FOR_EACH(args, i)
-	{
+	ARRAY_FOR_EACH(args, i) {
 		errno = 0;
 		zassert_equal(getenv_r(args[i].name, args[i].buf, args[i].size), -1,
 			      "getenv_r(\"%s\", %p, %zu): expected to fail", args[i].name,
@@ -90,7 +89,7 @@ ZTEST(env, test_getenv_r)
 	zassert_mem_equal(getenv("PWD"), M_PWD, strlen(M_PWD) + 1);
 }
 
-ZTEST(env, test_setenv)
+ZTEST(posix_single_process, test_setenv)
 {
 	zassert_equal(setenv(NULL, NULL, 0), -1);
 	zassert_equal(errno, EINVAL);
@@ -114,7 +113,7 @@ ZTEST(env, test_setenv)
 	zassert_mem_equal(getenv("HOME"), "/root", strlen("/root") + 1);
 }
 
-ZTEST(env, test_unsetenv)
+ZTEST(posix_single_process, test_unsetenv)
 {
 	/* not hardened / application should fault */
 	zassert_equal(unsetenv(NULL), -1);
@@ -137,7 +136,7 @@ ZTEST(env, test_unsetenv)
 	zassert_is_null(getenv("HOME"));
 }
 
-ZTEST(env, test_watertight)
+ZTEST(posix_single_process, test_watertight)
 {
 	extern size_t posix_env_get_allocated_space(void);
 
@@ -158,7 +157,7 @@ ZTEST(env, test_watertight)
 	zassert_equal(posix_env_get_allocated_space(), 0);
 }
 
-static void before(void *arg)
+void test_env_before(void)
 {
 	old_environ = environ;
 
@@ -172,9 +171,7 @@ static void before(void *arg)
 	zassert_equal((environ = environ_for_test), environ_for_test);
 }
 
-static void after(void *arg)
+void test_env_after(void)
 {
 	environ = old_environ;
 }
-
-ZTEST_SUITE(env, NULL, NULL, before, after, NULL);
diff --git a/tests/posix/single_process/src/main.c b/tests/posix/single_process/src/main.c
index 421af54891d4..c3384de60486 100644
--- a/tests/posix/single_process/src/main.c
+++ b/tests/posix/single_process/src/main.c
@@ -7,4 +7,17 @@
 
 #include <zephyr/ztest.h>
 
-ZTEST_SUITE(posix_single_process, NULL, NULL, NULL, NULL, NULL);
+void test_env_before(void);
+void test_env_after(void);
+
+static void before(void *arg)
+{
+	test_env_before();
+}
+
+static void after(void *arg)
+{
+	test_env_after();
+}
+
+ZTEST_SUITE(posix_single_process, NULL, NULL, before, after, NULL);
diff --git a/tests/posix/single_process/src/sysconf.c b/tests/posix/single_process/src/sysconf.c
index 7689ff04600a..bedfe21403ae 100644
--- a/tests/posix/single_process/src/sysconf.c
+++ b/tests/posix/single_process/src/sysconf.c
@@ -6,7 +6,8 @@
  */
 
 #include <zephyr/ztest.h>
-#include <unistd.h>
+
+#include <zephyr/posix/unistd.h>
 
 ZTEST(posix_single_process, test_posix_sysconf)
 {
diff --git a/tests/posix/single_process/src/uname.c b/tests/posix/single_process/src/uname.c
index 1d6b09d8c7ee..fcc52e02be51 100644
--- a/tests/posix/single_process/src/uname.c
+++ b/tests/posix/single_process/src/uname.c
@@ -4,9 +4,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <sys/utsname.h>
-#include <unistd.h>
-
+#include <zephyr/posix/sys/utsname.h>
+#include <zephyr/posix/unistd.h>
 #include <zephyr/ztest.h>
 
 ZTEST(posix_single_process, test_uname)
diff --git a/tests/posix/single_process/testcase.yaml b/tests/posix/single_process/testcase.yaml
index ce226e9dc9da..70abb822269e 100644
--- a/tests/posix/single_process/testcase.yaml
+++ b/tests/posix/single_process/testcase.yaml
@@ -10,10 +10,21 @@ common:
   min_flash: 64
   min_ram: 32
 tests:
-  portability.single_process: {}
+  portability.posix.single_process:
+    extra_configs:
+      - CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
+  portability.posix.single_process.armclang_std_libc:
+    toolchain_allow: armclang
+    extra_configs:
+      - CONFIG_ARMCLANG_STD_LIBC=y
+  portability.posix.single_process.arcmwdtlib:
+    toolchain_allow: arcmwdt
+    extra_configs:
+      - CONFIG_ARCMWDT_LIBC=y
   portability.posix.single_process.minimal:
     extra_configs:
       - CONFIG_MINIMAL_LIBC=y
+      - CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
   portability.posix.single_process.newlib:
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs: