diff --git a/.gitignore b/.gitignore
index 85704447..90cb9dca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,6 +62,12 @@
 /lib/x86-mes/0exit-42
 /lib/x86-mes/exit-42
 
+/lib/tests/*/[0-9a][0-9a-z]-*
+/lib/tests/*/x86-mes-*
+!/lib/tests/*/*.c
+!/lib/tests/*/*.exit
+!/lib/tests/*/*.stdout
+
 /scaffold/argv
 /scaffold/hello
 /scaffold/main
@@ -73,7 +79,11 @@
 /scaffold/x86_64-mes-*
 
 /scaffold/tests/x86-mes-*
-/scaffold/tests/[0-9a][0-9a-z]-[^.]*
+/scaffold/tests/[0-9a][0-9a-z]-*
+/scaffold/tests/t.*
+!/scaffold/tests/*.c
+!/scaffold/tests/*.exit
+!/scaffold/tests/*.stdout
 
 /src/mes.mes.symbols.h
 /src/gc.mes.h
diff --git a/build-aux/bootstrap.sh.in b/build-aux/bootstrap.sh.in
index e87ec4c5..1559299f 100644
--- a/build-aux/bootstrap.sh.in
+++ b/build-aux/bootstrap.sh.in
@@ -51,9 +51,9 @@ mv lib/libc+gnu.x86-mes-o lib/x86-mes/libc+gnu.o
 
 @GUILE@ -e main -L module scripts/mescc.scm -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o scaffold/x86-mes-argv scaffold/argv.x86-mes-o -l c-mini
 
-@GUILE@ -e main -L module scripts/mescc.scm -c -D 'VERSION="@VERSION@"' -D 'MODULEDIR="@moduledir@"' -D 'PREFIX="@prefix@"' -I . -I lib -I include -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o lib/tests/stdlib/malloc.x86-mes-o lib/tests/stdlib/malloc.c
+@GUILE@ -e main -L module scripts/mescc.scm -c -D 'VERSION="@VERSION@"' -D 'MODULEDIR="@moduledir@"' -D 'PREFIX="@prefix@"' -I . -I lib -I include -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o lib/tests/stdlib/50-malloc.x86-mes-o lib/tests/stdlib/50-malloc.c
 
-@GUILE@ -e main -L module scripts/mescc.scm -c -D 'VERSION="@VERSION@"' -D 'MODULEDIR="@moduledir@"' -D 'PREFIX="@prefix@"' -I . -I lib -I include -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o lib/tests/stdlib/getenv.x86-mes-o lib/tests/stdlib/getenv.c
+@GUILE@ -e main -L module scripts/mescc.scm -c -D 'VERSION="@VERSION@"' -D 'MODULEDIR="@moduledir@"' -D 'PREFIX="@prefix@"' -I . -I lib -I include -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o lib/tests/posix/50-getenv.x86-mes-o lib/tests/posix/50-getenv.c
 
 @GUILE@ -e main -L module scripts/mescc.scm -c -D 'VERSION="@VERSION@"' -D 'MODULEDIR="@moduledir@"' -D 'PREFIX="@prefix@"' -I . -I lib -I include -v -g -L lib/linux/x86-mes -L lib/linux -L lib/x86-mes -L lib -L @MES_SEED@ -o scaffold/micro-mes.x86-mes-o scaffold/micro-mes.c
 
diff --git a/build-aux/build-mes.sh b/build-aux/build-mes.sh
index c0b2857b..5254bfcc 100755
--- a/build-aux/build-mes.sh
+++ b/build-aux/build-mes.sh
@@ -69,11 +69,11 @@ compile scaffold/hello
 compile scaffold/argv
 (libc="-l c-mini" link scaffold/argv)
 
-[ "$mes_p" ] && compile lib/tests/stdlib/malloc
-[ "$mes_p" ] && link lib/tests/stdlib/malloc
+[ "$mes_p" ] && compile lib/tests/stdlib/50-malloc
+[ "$mes_p" ] && link lib/tests/stdlib/50-malloc
 
-[ "$mes_p" ] && compile lib/tests/stdlib/getenv
-[ "$mes_p" ] && link lib/tests/stdlib/getenv
+[ "$mes_p" ] && compile lib/tests/posix/50-getenv
+[ "$mes_p" ] && link lib/tests/posix/50-getenv
 
 
 [ "$mes_p" ] && compile scaffold/micro-mes
diff --git a/build-aux/check-mescc.sh b/build-aux/check-mescc.sh
index f1b821fd..3504eb16 100755
--- a/build-aux/check-mescc.sh
+++ b/build-aux/check-mescc.sh
@@ -26,206 +26,207 @@ set -e
 test_sh=${test_sh-${srcdest}build-aux/test.sh}
 
 tests="
-t
-00-exit-0
-01-return-0
-02-return-1
-03-call
-04-call-0
-05-call-1
-06-call-!1
-06-!call-1
-06-call-2
-06-call-string
-06-call-variable
-06-return-void
-07-include
-08-assign
-08-assign-negative
-08-assign-global
-10-if-0
-11-if-1
-12-if-==
-13-if-!=
-14-if-goto
-15-if-!f
-16-if-t
-17-compare-char
-17-compare-ge
-17-compare-gt
-17-compare-le
-17-compare-lt
-17-compare-unsigned-ge
-17-compare-unsigned-gt
-17-compare-unsigned-le
-17-compare-unsigned-lt
-17-compare-unsigned-char-le
-17-compare-unsigned-short-le
-17-compare-unsigned-long-le
-17-compare-and
-17-compare-or
-17-compare-and-or
-17-compare-assign
-17-compare-call
-18-assign-shadow
-20-while
-21-char[]-simple
-21-char[]
-22-while-char[]
-23-global-pointer-init-null
-23-global-pointer-init
-23-global-pointer-ref
-23-global-pointer-pointer-ref
-23-pointer-sub
-23-pointer
-30-strlen
-31-oputs
-32-call-wrap
-32-compare
-33-and-or
-34-pre-post
-35-compare-char
-36-compare-arithmetic
-37-compare-assign
-38-compare-call-2
-38-compare-call-3
-38-compare-call
-40-if-else
-41-?
-42-goto-label
-43-for-do-while
-44-switch
-44-switch-fallthrough
-44-switch-body-fallthrough
-45-void-call
-46-function-static
-47-function-expression
-48-global-static
-50-assert
-51-pointer-sub
-51-itoa
-51-strcmp
-51-strncmp
-53-strcpy
-54-argc
-54-argv
-55-char-array
-60-math
-61-array
-62-array
-63-struct
-63-struct-pointer
-63-struct-local
-63-struct-function
-63-struct-assign
-63-struct-array
-63-struct-array-assign
-63-struct-array-compare
-63-struct-cell
-64-make-cell
-65-read
-66-local-char-array
-70-strchr
-70-stdarg
-70-printf-hello
-70-printf-simple
-70-printf
-71-struct-array
-72-typedef-struct-def
-73-union-hello
-73-union
-74-multi-line-string
-75-struct-union
-76-pointer-arithmetic-pp
-76-pointer-arithmetic
-77-pointer-assign
-78-union-struct
-79-int-array-simple
-79-int-array
-7a-struct-char-array
-7b-struct-int-array-hello
-7b-struct-int-array-pointer
-7b-struct-int-array
-7c-dynarray
-7d-cast-char
-7e-struct-array-access
-7f-struct-pointer-arithmetic
-7g-struct-byte-word-field
-7h-struct-assign
-7i-struct-struct-simple
-7i-struct-struct
-7j-strtoull
-7k-empty-for
-7k-for-each-elem-simple
-7k-for-each-elem
-7l-struct-any-size-array-simple
-7l-struct-any-size-array
-7m-struct-char-array-assign
-7n-struct-struct-array
-7o-struct-pre-post-simple
-7o-struct-pre-post
-7p-struct-cast
-7q-bit-field-simple
-7q-bit-field
-7r-sign-extend
-7s-struct-short
-7s-unsigned-compare
-7t-function-destruct
-7u-double
-7u-long-long
-7u-?-expression
-7u-call-?
-7u-inc-byte-word
-7u-struct-func
-7u-struct-size10
-7u-vstack
-80-setjmp
-81-qsort
-81-qsort-dupes
-82-define
-83-heterogenoous-init
-84-struct-field-list
-85-sizeof
-86-strncpy
-87-sscanf
-88-strrchr
-90-strspn
-90-strpbrk
-91-fseek
-92-stat
-93-fread-fwrite
-94-unsetenv
-95-signal
-96-strto
-97-fopen
-98-fopen
-99-readdir
-9a-snprintf
-a0-call-trunc-char
-a0-call-trunc-short
-a0-call-trunc-int
-a0-math-divide-signed-negative
-a1-global-no-align
-a1-global-no-clobber
+scaffold/tests/t
+scaffold/tests/00-exit-0
+scaffold/tests/01-return-0
+scaffold/tests/02-return-1
+scaffold/tests/03-call
+scaffold/tests/04-call-0
+scaffold/tests/05-call-1
+scaffold/tests/06-call-!1
+scaffold/tests/06-!call-1
+scaffold/tests/06-call-2
+scaffold/tests/06-call-string
+scaffold/tests/06-call-variable
+scaffold/tests/06-return-void
+scaffold/tests/07-include
+scaffold/tests/08-assign
+scaffold/tests/08-assign-negative
+scaffold/tests/08-assign-global
+scaffold/tests/10-if-0
+scaffold/tests/11-if-1
+scaffold/tests/12-if-==
+scaffold/tests/13-if-!=
+scaffold/tests/14-if-goto
+scaffold/tests/15-if-!f
+scaffold/tests/16-if-t
+scaffold/tests/17-compare-char
+scaffold/tests/17-compare-ge
+scaffold/tests/17-compare-gt
+scaffold/tests/17-compare-le
+scaffold/tests/17-compare-lt
+scaffold/tests/17-compare-unsigned-ge
+scaffold/tests/17-compare-unsigned-gt
+scaffold/tests/17-compare-unsigned-le
+scaffold/tests/17-compare-unsigned-lt
+scaffold/tests/17-compare-unsigned-char-le
+scaffold/tests/17-compare-unsigned-short-le
+scaffold/tests/17-compare-unsigned-long-le
+scaffold/tests/17-compare-and
+scaffold/tests/17-compare-or
+scaffold/tests/17-compare-and-or
+scaffold/tests/17-compare-assign
+scaffold/tests/17-compare-call
+scaffold/tests/18-assign-shadow
+scaffold/tests/20-while
+scaffold/tests/21-char[]-simple
+scaffold/tests/21-char[]
+scaffold/tests/22-while-char[]
+scaffold/tests/23-global-pointer-init-null
+scaffold/tests/23-global-pointer-init
+scaffold/tests/23-global-pointer-ref
+scaffold/tests/23-global-pointer-pointer-ref
+scaffold/tests/23-pointer-sub
+scaffold/tests/23-pointer
+lib/tests/mes/30-oputs
+lib/tests/string/30-strlen
+scaffold/tests/32-call-wrap
+scaffold/tests/32-compare
+scaffold/tests/33-and-or
+scaffold/tests/34-pre-post
+scaffold/tests/35-compare-char
+scaffold/tests/36-compare-arithmetic
+scaffold/tests/37-compare-assign
+scaffold/tests/38-compare-call-2
+scaffold/tests/38-compare-call-3
+scaffold/tests/38-compare-call
+scaffold/tests/40-if-else
+scaffold/tests/41-?
+scaffold/tests/42-goto-label
+scaffold/tests/43-for-do-while
+scaffold/tests/44-switch
+scaffold/tests/44-switch-fallthrough
+scaffold/tests/44-switch-body-fallthrough
+scaffold/tests/45-void-call
+scaffold/tests/46-function-static
+scaffold/tests/47-function-expression
+scaffold/tests/48-global-static
+lib/tests/assert/50-assert
+lib/tests/mes/50-itoa
+lib/tests/posix/50-getenv
+lib/tests/string/50-strcmp
+lib/tests/string/50-strcpy
+lib/tests/string/50-strncmp
+scaffold/tests/51-pointer-sub
+scaffold/tests/54-argc
+scaffold/tests/54-argv
+scaffold/tests/55-char-array
+scaffold/tests/60-math
+scaffold/tests/61-array
+scaffold/tests/62-array
+scaffold/tests/63-struct
+scaffold/tests/63-struct-pointer
+scaffold/tests/63-struct-local
+scaffold/tests/63-struct-function
+scaffold/tests/63-struct-assign
+scaffold/tests/63-struct-array
+scaffold/tests/63-struct-array-assign
+scaffold/tests/63-struct-array-compare
+scaffold/tests/63-struct-cell
+scaffold/tests/64-make-cell
+scaffold/tests/65-read
+scaffold/tests/66-local-char-array
+scaffold/tests/70-stdarg
+lib/tests/stdio/70-printf-hello
+lib/tests/stdio/70-printf-simple
+lib/tests/stdio/70-printf
+lib/tests/stdlib/70-strtoull
+lib/tests/string/70-strchr
+scaffold/tests/71-struct-array
+scaffold/tests/72-typedef-struct-def
+scaffold/tests/73-union-hello
+scaffold/tests/73-union
+scaffold/tests/74-multi-line-string
+scaffold/tests/75-struct-union
+scaffold/tests/76-pointer-arithmetic-pp
+scaffold/tests/76-pointer-arithmetic
+scaffold/tests/77-pointer-assign
+scaffold/tests/78-union-struct
+scaffold/tests/79-int-array-simple
+scaffold/tests/79-int-array
+scaffold/tests/7a-struct-char-array
+scaffold/tests/7b-struct-int-array-hello
+scaffold/tests/7b-struct-int-array-pointer
+scaffold/tests/7b-struct-int-array
+scaffold/tests/7c-dynarray
+scaffold/tests/7d-cast-char
+scaffold/tests/7e-struct-array-access
+scaffold/tests/7f-struct-pointer-arithmetic
+scaffold/tests/7g-struct-byte-word-field
+scaffold/tests/7h-struct-assign
+scaffold/tests/7i-struct-struct-simple
+scaffold/tests/7i-struct-struct
+scaffold/tests/7k-empty-for
+scaffold/tests/7k-for-each-elem-simple
+scaffold/tests/7k-for-each-elem
+scaffold/tests/7l-struct-any-size-array-simple
+scaffold/tests/7l-struct-any-size-array
+scaffold/tests/7m-struct-char-array-assign
+scaffold/tests/7n-struct-struct-array
+scaffold/tests/7o-struct-pre-post-simple
+scaffold/tests/7o-struct-pre-post
+scaffold/tests/7p-struct-cast
+scaffold/tests/7q-bit-field-simple
+scaffold/tests/7q-bit-field
+scaffold/tests/7r-sign-extend
+scaffold/tests/7s-struct-short
+scaffold/tests/7s-unsigned-compare
+scaffold/tests/7t-function-destruct
+scaffold/tests/7u-double
+scaffold/tests/7u-long-long
+scaffold/tests/7u-?-expression
+scaffold/tests/7u-call-?
+scaffold/tests/7u-inc-byte-word
+scaffold/tests/7u-struct-func
+scaffold/tests/7u-struct-size10
+scaffold/tests/7u-vstack
+lib/tests/setjmp/80-setjmp
+lib/tests/stdio/80-sscanf
+lib/tests/stdlib/80-qsort
+lib/tests/stdlib/80-qsort-dupes
+lib/tests/string/80-strncpy
+lib/tests/string/80-strrchr
+scaffold/tests/82-define
+scaffold/tests/83-heterogenoous-init
+scaffold/tests/84-struct-field-list
+scaffold/tests/85-sizeof
+lib/tests/dirent/90-readdir
+lib/tests/io/90-stat
+lib/tests/posix/90-unsetenv
+lib/tests/signal/90-signal
+lib/tests/stdio/90-fopen
+lib/tests/stdio/90-fopen-append
+lib/tests/stdio/90-fread-fwrite
+lib/tests/stdio/90-fseek
+lib/tests/stdlib/90-strtol
+lib/tests/string/90-snprintf
+lib/tests/string/90-strpbrk
+lib/tests/string/90-strspn
+scaffold/tests/a0-call-trunc-char
+scaffold/tests/a0-call-trunc-short
+scaffold/tests/a0-call-trunc-int
+scaffold/tests/a0-math-divide-signed-negative
+scaffold/tests/a1-global-no-align
+scaffold/tests/a1-global-no-clobber
 "
 
 broken="$broken
-17-compare-unsigned-char-le
-17-compare-unsigned-short-le
-66-local-char-array
-a0-call-trunc-int
-a0-math-divide-signed-negative
+scaffold/tests/17-compare-unsigned-char-le
+scaffold/tests/17-compare-unsigned-short-le
+scaffold/tests/66-local-char-array
+scaffold/tests/a0-call-trunc-int
+scaffold/tests/a0-math-divide-signed-negative
 "
 
 if [ "$mes_arch" = "x86_64-gcc" ]; then
     broken="$broken
-21-char[]
-41-?
-70-printf-stdarg
-70-printf-simple
-70-printf
-80-setjmp
-a1-global-no-align
+scaffold/tests/21-char[]
+scaffold/tests/41-?
+scaffold/tests/stdio/70-printf-stdarg
+scaffold/tests/stdio/70-printf-simple
+scaffold/tests/stdio/70-printf
+lib/tests/setjmp/80-setjmp
+scaffold/tests/a1-global-no-align
 "
 fi
 
@@ -234,20 +235,20 @@ expect=$(echo $broken | wc -w)
 pass=0
 fail=0
 total=0
-mkdir -p scaffold/tests
 for t in $tests; do
-    if [ -z "${t/[012][0-9]-*/}" ]; then
+    b=$(basename "$t")
+    if [ -z "${b/[012][0-9]-*/}" ]; then
         libc=
-    elif [ -z "${t/[34][0-9]-*/}" ]; then
+    elif [ -z "${b/[34][0-9]-*/}" ]; then
         libc='-l c-mini'
-    elif [ -z "${t/[78][0-9a-z]-*/}" ]; then
+    elif [ -z "${b/[78][0-9a-z]-*/}" ]; then
         libc='-l c+tcc'
-    elif [ -z "${t/9[0-9a-z]-*/}" ]; then
+    elif [ -z "${b/9[0-9a-z]-*/}" ]; then
         libc='-l c+gnu'
     else
         libc='-l c'
     fi
-    sh $test_sh "scaffold/tests/$t" &> scaffold/tests/"$t".log
+    sh $test_sh "$t" &> "$t".log
     r=$?
     total=$((total+1))
     if [ $r = 0 ]; then
diff --git a/build-aux/test-cc.sh b/build-aux/test-cc.sh
index 99231b1f..ffc5bc5b 100755
--- a/build-aux/test-cc.sh
+++ b/build-aux/test-cc.sh
@@ -38,12 +38,12 @@ link "$t"
 r=0
 [ -f "$t".exit ] && r=$(cat "$t".exit)
 set +e
-$(dirname "$o")/${program_prefix}$(basename "$o") $ARGS > "$o".${program_prefix}stdout
+$(dirname "$o")/${program_prefix}$(basename "$o") $ARGS > "$o".${program_prefix}1 2> "$o".${program_prefix}2
 m=$?
-cat "$o".${program_prefix}stdout
+cat "$o".${program_prefix}1
 set -e
 
 [ $m = $r ]
-if [ -f "$t".expect ]; then
-    $DIFF -ub "$t".expect "$o".${program_prefix}stdout
+if [ -f "$t".stdout ]; then
+    $DIFF -ub "$t".stdout "$o".${program_prefix}1
 fi
diff --git a/lib/libc.c b/lib/libc.c
index 996f01f9..0d0c99ad 100644
--- a/lib/libc.c
+++ b/lib/libc.c
@@ -60,9 +60,9 @@ __mes_debug ()
 
 
 #if !___GNU__
-#include <string/memcpy.c>
-#include <stdlib/malloc.c>
 #include <assert/assert.c>
+#include <stdlib/malloc.c>
+#include <string/memcpy.c>
 #endif
 
 #include <stdio/getchar.c>
@@ -82,9 +82,9 @@ __mes_debug ()
 
 #include <stdlib/free.c>
 #include <stdlib/realloc.c>
-#include <stdlib/getenv.c>
-#include <stdlib/setenv.c>
 
+#include <posix/getenv.c>
 #include <posix/isatty.c>
+#include <posix/setenv.c>
 #include <posix/wait.c>
 #include <posix/execv.c>
diff --git a/lib/stdlib/getenv.c b/lib/posix/getenv.c
similarity index 100%
rename from lib/stdlib/getenv.c
rename to lib/posix/getenv.c
diff --git a/lib/stdlib/setenv.c b/lib/posix/setenv.c
similarity index 100%
rename from lib/stdlib/setenv.c
rename to lib/posix/setenv.c
diff --git a/scaffold/tests/50-assert.c b/lib/tests/assert/50-assert.c
similarity index 100%
rename from scaffold/tests/50-assert.c
rename to lib/tests/assert/50-assert.c
diff --git a/scaffold/tests/99-readdir.c b/lib/tests/dirent/90-readdir.c
similarity index 93%
rename from scaffold/tests/99-readdir.c
rename to lib/tests/dirent/90-readdir.c
index b974e75a..5b4043be 100644
--- a/scaffold/tests/99-readdir.c
+++ b/lib/tests/dirent/90-readdir.c
@@ -34,20 +34,20 @@ qsort_strcmp (void const* a, void const* b)
 int
 main ()
 {
-  DIR *d = opendir ("scaffold/tests/readdir-fu");
+  DIR *d = opendir ("lib/tests/dirent/readdir-fu");
   if (d)
     return 1;
   if (errno != ENOENT)
     return 2;
 
-  d = opendir ("scaffold/tests/99-readdir.c");
+  d = opendir ("lib/tests/dirent/90-readdir.c");
   if (d)
     return 3;
   if (errno != ENOTDIR)
     return 4;
 
   errno = 0;
-  d = opendir ("scaffold/tests/readdir.dir");
+  d = opendir ("lib/tests/dirent/readdir.dir");
   if (!d)
     return 5;
 
diff --git a/scaffold/tests/readdir.dir/dir/.keep b/lib/tests/dirent/readdir.dir/dir/.keep
similarity index 100%
rename from scaffold/tests/readdir.dir/dir/.keep
rename to lib/tests/dirent/readdir.dir/dir/.keep
diff --git a/scaffold/tests/readdir.dir/file b/lib/tests/dirent/readdir.dir/file
similarity index 100%
rename from scaffold/tests/readdir.dir/file
rename to lib/tests/dirent/readdir.dir/file
diff --git a/scaffold/tests/readdir.dir/link b/lib/tests/dirent/readdir.dir/link
similarity index 100%
rename from scaffold/tests/readdir.dir/link
rename to lib/tests/dirent/readdir.dir/link
diff --git a/scaffold/tests/92-stat.c b/lib/tests/io/90-stat.c
similarity index 100%
rename from scaffold/tests/92-stat.c
rename to lib/tests/io/90-stat.c
diff --git a/scaffold/tests/31-oputs.c b/lib/tests/mes/30-oputs.c
similarity index 100%
rename from scaffold/tests/31-oputs.c
rename to lib/tests/mes/30-oputs.c
diff --git a/scaffold/tests/51-itoa.c b/lib/tests/mes/50-itoa.c
similarity index 100%
rename from scaffold/tests/51-itoa.c
rename to lib/tests/mes/50-itoa.c
diff --git a/lib/tests/stdlib/getenv.c b/lib/tests/posix/50-getenv.c
similarity index 84%
rename from lib/tests/stdlib/getenv.c
rename to lib/tests/posix/50-getenv.c
index 40130793..f58b7fdd 100644
--- a/lib/tests/stdlib/getenv.c
+++ b/lib/tests/posix/50-getenv.c
@@ -19,14 +19,7 @@
  */
 
 #include "libmes.h"
-#include "string.h"
 #include "stdlib.h"
-#define strlen xstrlen
-#define strncmp xstrncmp
-#define getenv xgetenv
-#include "lib/string/strlen.c"
-#include "lib/string/strncmp.c"
-#include "lib/stdlib/getenv.c"
 
 int
 main (int argc, char const *argv[])
diff --git a/scaffold/tests/94-unsetenv.c b/lib/tests/posix/90-unsetenv.c
similarity index 100%
rename from scaffold/tests/94-unsetenv.c
rename to lib/tests/posix/90-unsetenv.c
diff --git a/scaffold/tests/80-setjmp.c b/lib/tests/setjmp/80-setjmp.c
similarity index 100%
rename from scaffold/tests/80-setjmp.c
rename to lib/tests/setjmp/80-setjmp.c
diff --git a/scaffold/tests/95-signal.c b/lib/tests/signal/90-signal.c
similarity index 100%
rename from scaffold/tests/95-signal.c
rename to lib/tests/signal/90-signal.c
diff --git a/scaffold/tests/70-printf-hello.c b/lib/tests/stdio/70-printf-hello.c
similarity index 100%
rename from scaffold/tests/70-printf-hello.c
rename to lib/tests/stdio/70-printf-hello.c
diff --git a/scaffold/tests/70-printf-simple.c b/lib/tests/stdio/70-printf-simple.c
similarity index 100%
rename from scaffold/tests/70-printf-simple.c
rename to lib/tests/stdio/70-printf-simple.c
diff --git a/scaffold/tests/70-printf.c b/lib/tests/stdio/70-printf.c
similarity index 100%
rename from scaffold/tests/70-printf.c
rename to lib/tests/stdio/70-printf.c
diff --git a/scaffold/tests/87-sscanf.c b/lib/tests/stdio/80-sscanf.c
similarity index 100%
rename from scaffold/tests/87-sscanf.c
rename to lib/tests/stdio/80-sscanf.c
diff --git a/scaffold/tests/98-fopen.c b/lib/tests/stdio/90-fopen-append.c
similarity index 100%
rename from scaffold/tests/98-fopen.c
rename to lib/tests/stdio/90-fopen-append.c
diff --git a/scaffold/tests/97-fopen.c b/lib/tests/stdio/90-fopen.c
similarity index 100%
rename from scaffold/tests/97-fopen.c
rename to lib/tests/stdio/90-fopen.c
diff --git a/scaffold/tests/93-fread-fwrite.c b/lib/tests/stdio/90-fread-fwrite.c
similarity index 100%
rename from scaffold/tests/93-fread-fwrite.c
rename to lib/tests/stdio/90-fread-fwrite.c
diff --git a/scaffold/tests/91-fseek.c b/lib/tests/stdio/90-fseek.c
similarity index 100%
rename from scaffold/tests/91-fseek.c
rename to lib/tests/stdio/90-fseek.c
diff --git a/lib/tests/stdlib/malloc.c b/lib/tests/stdlib/50-malloc.c
similarity index 100%
rename from lib/tests/stdlib/malloc.c
rename to lib/tests/stdlib/50-malloc.c
diff --git a/scaffold/tests/7j-strtoull.c b/lib/tests/stdlib/70-strtoull.c
similarity index 100%
rename from scaffold/tests/7j-strtoull.c
rename to lib/tests/stdlib/70-strtoull.c
diff --git a/scaffold/tests/81-qsort-dupes.c b/lib/tests/stdlib/80-qsort-dupes.c
similarity index 100%
rename from scaffold/tests/81-qsort-dupes.c
rename to lib/tests/stdlib/80-qsort-dupes.c
diff --git a/scaffold/tests/81-qsort.c b/lib/tests/stdlib/80-qsort.c
similarity index 100%
rename from scaffold/tests/81-qsort.c
rename to lib/tests/stdlib/80-qsort.c
diff --git a/scaffold/tests/96-strto.c b/lib/tests/stdlib/90-strtol.c
similarity index 100%
rename from scaffold/tests/96-strto.c
rename to lib/tests/stdlib/90-strtol.c
diff --git a/scaffold/tests/30-strlen.c b/lib/tests/string/30-strlen.c
similarity index 100%
rename from scaffold/tests/30-strlen.c
rename to lib/tests/string/30-strlen.c
diff --git a/scaffold/tests/51-strcmp.c b/lib/tests/string/50-strcmp.c
similarity index 100%
rename from scaffold/tests/51-strcmp.c
rename to lib/tests/string/50-strcmp.c
diff --git a/scaffold/tests/53-strcpy.c b/lib/tests/string/50-strcpy.c
similarity index 100%
rename from scaffold/tests/53-strcpy.c
rename to lib/tests/string/50-strcpy.c
diff --git a/scaffold/tests/51-strncmp.c b/lib/tests/string/50-strncmp.c
similarity index 100%
rename from scaffold/tests/51-strncmp.c
rename to lib/tests/string/50-strncmp.c
diff --git a/scaffold/tests/70-strchr.c b/lib/tests/string/70-strchr.c
similarity index 100%
rename from scaffold/tests/70-strchr.c
rename to lib/tests/string/70-strchr.c
diff --git a/scaffold/tests/86-strncpy.c b/lib/tests/string/80-strncpy.c
similarity index 100%
rename from scaffold/tests/86-strncpy.c
rename to lib/tests/string/80-strncpy.c
diff --git a/scaffold/tests/88-strrchr.c b/lib/tests/string/80-strrchr.c
similarity index 100%
rename from scaffold/tests/88-strrchr.c
rename to lib/tests/string/80-strrchr.c
diff --git a/scaffold/tests/9a-snprintf.c b/lib/tests/string/90-snprintf.c
similarity index 100%
rename from scaffold/tests/9a-snprintf.c
rename to lib/tests/string/90-snprintf.c
diff --git a/scaffold/tests/90-strpbrk.c b/lib/tests/string/90-strpbrk.c
similarity index 100%
rename from scaffold/tests/90-strpbrk.c
rename to lib/tests/string/90-strpbrk.c
diff --git a/scaffold/tests/90-strspn.c b/lib/tests/string/90-strspn.c
similarity index 100%
rename from scaffold/tests/90-strspn.c
rename to lib/tests/string/90-strspn.c