Add some test-related files.

Author: gnachman

tests/double_width.txt

@@ -0,0 +1,5 @@
+Always double width:
+汉字
+
+Ambiguous width:
+αα

tests/spam.cc

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+void setline(char* s, int n) {
+  int l = random() % n;
+  int j;
+  for (j = 0; j < l; ++j) {
+    s[j] = 'A' + (random() % 60);
+  }
+  s[j] = 0;
+}
+
+int main(int argc, char*argv[]) {
+  int n;
+  if (argc == 1) {
+    n = 1000000;
+  } else {
+    n = atoi(argv[1]);
+  }
+  for (int i = 0; i < n; ++i) {
+    char buffer[100];
+    setline(buffer, sizeof(buffer)-1);
+    printf("%s\n", buffer);
+  }
+  return 0;
+}
+