diff --git a/Makefile.am b/Makefile.am
index 5fbc7e0..82f0f8d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,8 +4,8 @@ libcwSRC =
 libcwHDR += src/libcw/cwCommon.h src/libcw/cwCommonImpl.h   src/libcw/cwMem.h   src/libcw/cwLog.h    src/libcw/cwUtility.h
 libcwSRC +=                      src/libcw/cwCommonImpl.cpp src/libcw/cwMem.cpp src/libcw/cwLog.cpp  src/libcw/cwUtility.cpp
 
-libcwHDR += src/libcw/cwString.h   src/libcw/cwMath.h   src/libcw/cwVectOps.h src/libcw/cwMtx.h    src/libcw/cwVariant.h
-libcwSRC += src/libcw/cwString.cpp src/libcw/cwMath.cpp                       src/libcw/cwMtx.cpp  src/libcw/cwVariant.cpp
+libcwHDR += src/libcw/cwString.h   src/libcw/cwMath.h   src/libcw/cwVectOps.h   src/libcw/cwMtx.h    src/libcw/cwVariant.h
+libcwSRC += src/libcw/cwString.cpp src/libcw/cwMath.cpp src/libcw/cwVectOps.cpp src/libcw/cwMtx.cpp  src/libcw/cwVariant.cpp
 
 libcwHDR += src/libcw/cwB23Tree.h
 libcwSRC += src/libcw/cwB23Tree.cpp
@@ -46,8 +46,8 @@ libcwSRC +=                       src/libcw/cwUi.cpp src/libcw/cwUiTest.cpp
 
 endif
 
-libcwHDR += src/libcw/cwKeyboard.h
-libcwSRC += src/libcw/cwKeyboard.cpp
+libcwHDR += src/libcw/cwKeyboard.h    src/libcw/cwTest.h
+libcwSRC += src/libcw/cwKeyboard.cpp  src/libcw/cwTest.cpp
 
 libcwHDR += src/libcw/cwSerialPortDecls.h src/libcw/cwSerialPort.h    src/libcw/cwSerialPortSrv.h
 libcwSRC +=                               src/libcw/cwSerialPort.cpp  src/libcw/cwSerialPortSrv.cpp
diff --git a/cwFileSys.cpp b/cwFileSys.cpp
index 6661082..9574f50 100644
--- a/cwFileSys.cpp
+++ b/cwFileSys.cpp
@@ -1,8 +1,12 @@
 #include "cwCommon.h"
 #include "cwLog.h"
+#include "cwCommonImpl.h"
+
+#include "cwTest.h"
+#include "cwObject.h"
 
 #include "cwFileSys.h"
-#include "cwCommonImpl.h"
+
 #include "cwMem.h"
 #include "cwString.h"
 #include "cwText.h"
@@ -893,3 +897,33 @@ cw::rc_t cw::filesys::makeDir( const char* dirStr )
   
   return kOkRC;
 }
+
+
+cw::rc_t cw::filesys::test( const test::test_args_t& args )
+{
+  rc_t rc = kOkRC;
+
+  filesys::pathPart_t* pp = filesys::pathParts(__FILE__);
+  
+  cwLogPrint("dir:%s",pp->dirStr);
+  cwLogPrint("fn: %s",pp->fnStr);
+  cwLogPrint("ext:%s",pp->extStr);
+
+  char* fn = filesys::makeFn( pp->dirStr, pp->fnStr, pp->extStr, nullptr );
+
+  cwLogPrint("fn: %s",fn);
+
+  mem::release(pp);
+  mem::release(fn);
+
+
+  const char myPath[] = "~/src/foo";
+
+  char* expPath = filesys::expandPath(myPath);
+
+  cwLogPrint("%s %s",myPath,expPath);
+
+  mem::release(expPath);
+  
+  return rc;
+}
diff --git a/cwFileSys.h b/cwFileSys.h
index ae2924c..d55af8c 100644
--- a/cwFileSys.h
+++ b/cwFileSys.h
@@ -90,6 +90,8 @@ namespace cw
     char* makeVersionedDirectory(const char* recordDir, const char* recordFolder );
     
     rc_t makeDir( const char* dirStr );
+
+    rc_t test( const test::test_args_t& args );
   }
   
 }
diff --git a/cwFlowTest.h b/cwFlowTest.h
index 51c40bb..5fb828a 100644
--- a/cwFlowTest.h
+++ b/cwFlowTest.h
@@ -4,6 +4,6 @@ namespace cw
   namespace flow
   {
     
-    rc_t test(  const object_t* cfg, int argc, const char* argv[] );
+    rc_t test( const test::test_args_t& args );
   }
 }
diff --git a/cwLex.cpp b/cwLex.cpp
index da73cc2..91144f2 100644
--- a/cwLex.cpp
+++ b/cwLex.cpp
@@ -3,7 +3,8 @@
 #include "cwCommonImpl.h"
 #include "cwMem.h"
 #include "cwFile.h"
-
+#include "cwTest.h"
+#include "cwObject.h"
 #include "cwLex.h"
 
 
@@ -853,7 +854,7 @@ namespace cw
     //)
 
     //(
-    rc_t test()
+    rc_t test( const test::test_args_t& args )
     {
       rc_t     rc  = kOkRC;
       unsigned tid = kInvalidId;
diff --git a/cwLex.h b/cwLex.h
index c77aafd..9e5a72f 100644
--- a/cwLex.h
+++ b/cwLex.h
@@ -129,7 +129,7 @@ namespace cw
     const char* idToLabel( handle_t h, unsigned typeId );
 
     // Lexer testing stub.
-    rc_t test(  );
+    rc_t test( const test::test_args_t& args );
   }
 }
 
diff --git a/cwObject.cpp b/cwObject.cpp
index 60682f8..f5382db 100644
--- a/cwObject.cpp
+++ b/cwObject.cpp
@@ -5,6 +5,7 @@
 #include "cwCommonImpl.h"
 #include "cwMem.h"
 #include "cwFile.h"
+#include "cwTest.h"
 #include "cwLex.h"
 #include "cwText.h"
 #include "cwNumericConvert.h"
@@ -152,37 +153,37 @@ namespace cw
   void _objTypePrintIndent( const char* text, unsigned indent, const char* indentStr=" " )
   {
     for(unsigned i=0; i<indent; ++i)
-      printf("%s",indentStr);
-    printf("%s",text); 
+      cwLogPrint("%s",indentStr);
+    cwLogPrint("%s",text); 
   }
 
   void _objTypePrintChild( const object_t* o, print_ctx_t& c, const char* eolStr=",\n", const char* indentStr=" " )
   {
     _objTypePrintIndent(" ",c.indent,indentStr);
     o->type->print(o,c);
-    printf("%s",eolStr);
+    cwLogPrint("%s",eolStr);
   }
   
-  void _objTypePrintNull(   const object_t* o, print_ctx_t& c ) { printf("NULL "); }
-  void _objTypePrintError(  const object_t* o, print_ctx_t& c ) { printf("Error "); }
-  void _objTypePrintChar(   const object_t* o, print_ctx_t& c ) { printf("%c",o->u.c); }
-  void _objTypePrintInt8(   const object_t* o, print_ctx_t& c ) { printf("%i",o->u.i8); }
-  void _objTypePrintUInt8(  const object_t* o, print_ctx_t& c ) { printf("%i",o->u.u8); }
-  void _objTypePrintInt16(  const object_t* o, print_ctx_t& c ) { printf("%i",o->u.i16); }
-  void _objTypePrintUInt16( const object_t* o, print_ctx_t& c ) { printf("%i",o->u.u16); }
-  void _objTypePrintInt32(  const object_t* o, print_ctx_t& c ) { printf("%i",o->u.i32); }
-  void _objTypePrintUInt32( const object_t* o, print_ctx_t& c ) { printf("%i",o->u.u32); }
-  void _objTypePrintInt64(  const object_t* o, print_ctx_t& c ) { printf("%lli", o->u.i64); }
-  void _objTypePrintUInt64( const object_t* o, print_ctx_t& c ) { printf("%lli", o->u.u64); }
-  void _objTypePrintBool(   const object_t* o, print_ctx_t& c ) { printf("%s",o->u.b ? "true" : "false"); }
-  void _objTypePrintFloat(  const object_t* o, print_ctx_t& c ) { printf("%f",o->u.f); }
-  void _objTypePrintDouble( const object_t* o, print_ctx_t& c ) { printf("%f",o->u.d); }
-  void _objTypePrintString( const object_t* o, print_ctx_t& c ) { printf("%s",o->u.str); }
-  void _objTypePrintVect(   const object_t* o, print_ctx_t& c ) { printf("<vect>"); }
+  void _objTypePrintNull(   const object_t* o, print_ctx_t& c ) { cwLogPrint("NULL "); }
+  void _objTypePrintError(  const object_t* o, print_ctx_t& c ) { cwLogPrint("Error "); }
+  void _objTypePrintChar(   const object_t* o, print_ctx_t& c ) { cwLogPrint("%c",o->u.c); }
+  void _objTypePrintInt8(   const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.i8); }
+  void _objTypePrintUInt8(  const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.u8); }
+  void _objTypePrintInt16(  const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.i16); }
+  void _objTypePrintUInt16( const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.u16); }
+  void _objTypePrintInt32(  const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.i32); }
+  void _objTypePrintUInt32( const object_t* o, print_ctx_t& c ) { cwLogPrint("%i",o->u.u32); }
+  void _objTypePrintInt64(  const object_t* o, print_ctx_t& c ) { cwLogPrint("%lli", o->u.i64); }
+  void _objTypePrintUInt64( const object_t* o, print_ctx_t& c ) { cwLogPrint("%lli", o->u.u64); }
+  void _objTypePrintBool(   const object_t* o, print_ctx_t& c ) { cwLogPrint("%s",o->u.b ? "true" : "false"); }
+  void _objTypePrintFloat(  const object_t* o, print_ctx_t& c ) { cwLogPrint("%f",o->u.f); }
+  void _objTypePrintDouble( const object_t* o, print_ctx_t& c ) { cwLogPrint("%f",o->u.d); }
+  void _objTypePrintString( const object_t* o, print_ctx_t& c ) { cwLogPrint("%s",o->u.str); }
+  void _objTypePrintVect(   const object_t* o, print_ctx_t& c ) { cwLogPrint("<vect>"); }
   void _objTypePrintPair(   const object_t* o, print_ctx_t& c )
   {
     o->u.children->type->print(o->u.children,c);
-    printf(": ");
+    cwLogPrint(": ");
     o->u.children->sibling->type->print(o->u.children->sibling,c);    
   }
   
@@ -1013,4 +1014,118 @@ cw::rc_t cw::objectToFile( const char* fn, const object_t* obj )
   return rc;
 }
 
+namespace cw
+{
+  rc_t _object_test_basic( const test::test_args_t& args )
+  {
+    rc_t          rc   = kOkRC;  
+    cw::object_t* o    = nullptr;
+    const char    s [] = "{ a:1, b:2, c:[ 1.23, 4.56 ], d:true, e:false, f:true }";
+
+    int a = 0;
+    int b = 0;
+    const cw::object_t* c = nullptr;
+    bool d,e,f;
+
+    const unsigned bufN = 128;
+    char buf[bufN];
+
+    unsigned i = 0;
+
+    cw::object_t* oo = nullptr;
+  
+    if((rc = cw::objectFromString(s,o)) != kOkRC )
+      goto errLabel;
+
+    int v;
+    if((rc = o->get("b",v)) != kOkRC )
+      goto errLabel;
+  
+    cwLogPrint("value:%i\n",v);
+  
+    o->print();
+
+  
+    if((rc = o->getv("a",a,"b",b)) != kOkRC )
+      goto errLabel;
+  
+    cwLogPrint("G: %i %i\n",a,b);
+
+
+    if((rc = o->readv("a",0,a,
+                      "b",0,b,
+                      "c",cw::kOptFl | cw::kListTId,c,
+                      "d",0,d,
+                      "e",0,e,
+                      "f",0,f)) != kOkRC )
+    {
+      goto errLabel;
+    }
+  
+    cwLogPrint("R: %i %i : %i %i %i\n",a,b,d,e,f);
+
+  
+    i = o->to_string(buf,bufN);
+    cwLogPrint("%i : %s\n",i, buf);
+  
+    oo = o->duplicate();
+
+    oo->print();
+  
+    oo->free();
+  
+    
+    o->free();
+
+  errLabel:
+    return rc;
+  }
+
+  rc_t _object_test_to_json( const test::test_args_t& args )
+  {
+    double   v0[] = {1.23,2.34,3.45};
+    unsigned v0N  = sizeof(v0)/sizeof(v0[0]);
+    int      v1[] = {-1,0,1,2,3,4};
+    unsigned v1N  = sizeof(v1)/sizeof(v1[0]);
+  
+    cw::object_t* d = cw::newDictObject();
+
+    d->putv("A","Abc","B",1.234);
+    d->put_numeric_list("v0",v0,v0N);
+    d->put_numeric_list("v1",v1,v1N);
+
+    char* s = d->to_string();
+    cwLogPrint("%s\n",s);
+    cw::mem::release(s);
+
+    d->free();
+
+    return kOkRC;
+  
+  }
+
+}
+
+
+cw::rc_t cw::object_test( const test::test_args_t& args )
+{
+  rc_t rc = kOkRC;
+
+  if( textIsEqual(args.test_label,"basic") )
+  {
+    rc = _object_test_basic(args);
+    goto errLabel;
+  }
+  
+  if( textIsEqual(args.test_label,"to_json") )
+  {
+    rc = _object_test_to_json(args);
+    goto errLabel;
+  }
+
+  rc = cwLogError(kInvalidArgRC,"Unknown test case module:%s test:%s.",args.module_label,args.test_label);
+  
+errLabel:
+  return cw::kOkRC;
+}
 
diff --git a/cwObject.h b/cwObject.h
index ed1a6ad..3b937fa 100644
--- a/cwObject.h
+++ b/cwObject.h
@@ -460,6 +460,8 @@ namespace cw
 
   rc_t objectToFile( const char* fn, const object_t* obj );
 
+  rc_t object_test( const test::test_args_t& args );
+
 
 }
 
diff --git a/cwTime.cpp b/cwTime.cpp
index ef7f211..7fd5658 100644
--- a/cwTime.cpp
+++ b/cwTime.cpp
@@ -1,6 +1,7 @@
 #include "cwCommon.h"
 #include "cwLog.h"
 #include "cwCommonImpl.h"
+#include "cwTest.h"
 #include "cwTime.h"
 
 #ifdef OS_OSX
@@ -399,7 +400,7 @@ unsigned cw::time::formatDateTime( char* buffer, unsigned bufN, bool includeDate
   return (unsigned)n;
 }
 
-cw::rc_t cw::time::test()
+cw::rc_t cw::time::test(const test::test_args_t& test )
 {
 
   spec_t t0,t1;
@@ -410,15 +411,15 @@ cw::rc_t cw::time::test()
 
   unsigned dMs = elapsedMs(t0,t1);
 
-  printf("dMs:%i : GTE:%i LTE:%i\n",dMs, isGTE(t0,t1), isLTE(t0,t1) );
+  cwLogPrint("dMs:%i : GTE:%i LTE:%i\n",dMs, isGTE(t0,t1), isLTE(t0,t1) );
 
   
   microsecondsToSpec( t0, 2500000 );        // 2.5 seconds
-  printf("%li %li\n",t0.tv_sec,t0.tv_nsec);
+  cwLogPrint("%li %li\n",t0.tv_sec,t0.tv_nsec);
   subtractMicros( t0, 750000 );             // subtract .75 seconds
-  printf("%li %li\n",t0.tv_sec,t0.tv_nsec);
+  cwLogPrint("%li %li\n",t0.tv_sec,t0.tv_nsec);
   subtractMicros( t0, 500000 );             // subtract .5 seconds
-  printf("%li %li\n",t0.tv_sec,t0.tv_nsec);
+  cwLogPrint("%li %li\n",t0.tv_sec,t0.tv_nsec);
 
 
   time::get(t0);
@@ -429,11 +430,11 @@ cw::rc_t cw::time::test()
   
   int usec = time::elapsedMicros(t0,t1);
 
-  printf("usec:%i\n",usec);
+  cwLogPrint("usec:%i\n",usec);
 
   t0 = current_time();
   sleepMs(1000);
-  printf("sleep %i ms\n",elapsedMs(t0));
+  cwLogPrint("sleep %i ms\n",elapsedMs(t0));
 
 
   return kOkRC;
diff --git a/cwTime.h b/cwTime.h
index 7f1a3ed..5c4d9b7 100644
--- a/cwTime.h
+++ b/cwTime.h
@@ -85,7 +85,7 @@ namespace cw
     // Return count of bytes in in buf[]
     unsigned formatDateTime( char* buf, unsigned bufN, bool includeDateFl=false );
 
-    rc_t test();
+    rc_t test( const test::test_args_t& test );
 
     //)
 
diff --git a/cwVectOps.cpp b/cwVectOps.cpp
new file mode 100644
index 0000000..c8288b8
--- /dev/null
+++ b/cwVectOps.cpp
@@ -0,0 +1,15 @@
+#include "cwCommon.h"
+#include "cwLog.h"
+#include "cwCommonImpl.h"
+#include "cwTest.h"
+#include "cwVectOps.h"
+
+cw::rc_t cw::vop::test( const test::test_args_t& args )
+{
+  int v1[] = { 1,2,1,2,1,2,1,2,1,2 };
+  int v0[ 10 ];
+  
+  cw::vop::deinterleave( v0, v1, 5, 2 );
+  cw::vop::print(v0,10,"%i ");
+  return cw::kOkRC;
+}
diff --git a/cwVectOps.h b/cwVectOps.h
index 277ec11..bc8f087 100644
--- a/cwVectOps.h
+++ b/cwVectOps.h
@@ -17,10 +17,10 @@ namespace cw
       
       if( label != nullptr )
       {
-        printf("%s : ",label);
+        cwLogPrint("%s : ",label);
         if( colN && n > colN )
         {
-          printf("\n");
+          cwLogPrint("\n");
           newline_fl = true;
         }
       }
@@ -30,19 +30,19 @@ namespace cw
       
       for(unsigned i=0; i<n; ++i)
       {
-        printf(fmt,v0[i]);
+        cwLogPrint(fmt,v0[i]);
 
         newline_fl = false;
         
         if( (n+1) % colN == 0 )
         {
-          printf("\n");
+          cwLogPrint("\n");
           newline_fl = true;
         }
       }
 
       if( !newline_fl )
-        printf("\n");
+        cwLogPrint("\n");
     }
 
 
@@ -545,8 +545,7 @@ namespace cw
   
     }
     
-    
-
+    rc_t test( const test::test_args_t& args );
     
   }
 }