Update testing_checklist

testing/testing_checklist.md

+## Web testing checklist
+### Funtionality
+    -There is no dead link
+    -Redirect to the correct page when clicking the link
+    -Link format is right
+    -Return expected result when clicking the button
+    -After some actions,the label of the button is changed porperly
+    -Can enter valid value in a text box.Expected result is returned 
+    -System works well when entering max-length and min-length value in a text box
+    -Error message when entering invalid value: greater than max length, less than min length,invalid format (Ex: input alphabet for a numeric text box)
+    -Auto-suggestion: auto suggests right value, can select the suggested value
+    -The list of the select box is right
+    -Can select any value from the select box
+    -Can not let the mandatory field empty, proper message
+    -Can let the optional field empty
+    -Can load required files with the valid filename.The values are correct
+    -Can upload correct files.
+    -Can not upload files with empty mandatory fields
+    -Can upload files with empty optional fields
+    -Can not upload wrong files
+### Usibilty
+    -All the labels, contents, paragraphs is not mispelled
+    -Layout format (font, color, underline, paragraph space ...) is OK
+    -The information (label,instruction...) is simple, clear, not confused
+    
+    
+    
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