diff --git a/icu4c/source/test/intltest/strtest.cpp b/icu4c/source/test/intltest/strtest.cpp
index e565e435a46..0926de1cc33 100644
--- a/icu4c/source/test/intltest/strtest.cpp
+++ b/icu4c/source/test/intltest/strtest.cpp
@@ -23,23 +23,55 @@
 #include "intltest.h"
 #include "strtest.h"
 
+void StringTest::TestEndian() {
+    union {
+        uint8_t byte;
+        uint16_t word;
+    } u;
+    u.word=0x0100;
+    if(U_IS_BIG_ENDIAN!=u.byte) {
+        errln("TestEndian: U_IS_BIG_ENDIAN needs to be fixed in platform.h");
+    }
+}
+
 void StringTest::TestSizeofWCharT() {
     if(U_SIZEOF_WCHAR_T!=sizeof(wchar_t)) {
         errln("TestSizeofWCharT: U_SIZEOF_WCHAR_T!=sizeof(wchar_t) - U_SIZEOF_WCHAR_T needs to be fixed in platform.h");
     }
 }
 
+void StringTest::TestCharsetFamily() {
+    unsigned char c='A';
+    if( U_CHARSET_FAMILY==U_ASCII_FAMILY && c!=0x41 ||
+        U_CHARSET_FAMILY==U_EBCDIC_FAMILY && c!=0xc1
+    ) {
+        errln("TestCharsetFamily: U_CHARSET_FAMILY needs to be fixed in platform.h");
+    }
+}
+
 void StringTest::runIndexedTest(int32_t index, bool_t exec, char *&name, char *par) {
     if(exec) {
         logln("TestSuite Character and String Test: ");
     }
     switch(index) {
     case 0:
+        name="TestEndian";
+        if(exec) {
+            TestEndian();
+        }
+        break;
+    case 1:
         name="TestSizeofWCharT";
         if(exec) {
             TestSizeofWCharT();
         }
         break;
+    case 2:
+        name="TestCharsetFamily";
+        if(exec) {
+            TestCharsetFamily();
+        }
+        break;
     default:
         name="";
         break;
diff --git a/icu4c/source/test/intltest/strtest.h b/icu4c/source/test/intltest/strtest.h
index e21a8cbc45e..7c50e80b7f9 100644
--- a/icu4c/source/test/intltest/strtest.h
+++ b/icu4c/source/test/intltest/strtest.h
@@ -36,7 +36,9 @@ public:
     void runIndexedTest(int32_t index, bool_t exec, char *&name, char *par=NULL);
 
 private:
+    void TestEndian();
     void TestSizeofWCharT();
+    void TestCharsetFamily();
 };
 
 #endif