[test] Initial import of an emscripten test suite.

test/emscripten/core/test_wprintf-O3.out

Index: test/emscripten/core/test_wprintf-O3.out
diff --git a/test/emscripten/core/test_wprintf-O3.out b/test/emscripten/core/test_wprintf-O3.out
new file mode 100644
index 0000000000000000000000000000000000000000..8dfed67acfeb6f7948d6d01b0c58ae3f63509b43
--- /dev/null
+++ b/test/emscripten/core/test_wprintf-O3.out
@@ -0,0 +1,59 @@
+fwprintf told us 7
+file size is 7
+str starts with 0x74
+str continues with 0x65
+str continues with 0x73
+format    starts with 0x74
+fmt    continues with 0x65
+fmt    continues with 0x73
+vswprintf told us 36
+vswoutput st-rts with 0x74
+vsw    continues with 0x65
+vsw    continues with 0x73
+test string has 36 wide characters.
+format    starts with 0x74
+fmt    continues with 0x65
+fmt    continues with 0x73
+vswprintf told us 36
+vswoutput st-rts with 0x74
+vsw    continues with 0x65
+vsw    continues with 0x73
+test string has 36 wide characters.
+format    starts with 0x74
+fmt    continues with 0x65
+fmt    continues with 0x73
+vswprintf told us 36
+vswoutput st-rts with 0x74
+vsw    continues with 0x65
+vsw    continues with 0x73
+test string has 36 wide characters.
+Characters: a A 
+Decimals: 1977 650000
+Preceding with blanks:       1977 
+Preceding with zeros: 0000001977 
+Some different radixes: 100 64 144 0x64 0144 
+floats: 3.14 +3e+00 3.141600E+00 
+Width trick:    10 
+A wide string 
+swprintf told us 20
+pre 84
+pre 104
+pre 101
+pre 32
+pre 104
+pre 97
+pre 108
+pre 102
+pre 32
+pre 111
+post 84
+post 104
+post 101
+post 32
+post 104
+post 97
+post 108
+post 102
+post 32
+post 111
+The half of 80 is 40, and the half of that is 20.