Update manual testing for find and deltag

docs/DeveloperGuide.md

@@ -544,23 +544,48 @@ testers are expected to do more *exploratory* testing.
 
 1. Deleting a person while all persons are being shown
 
-   1. Prerequisites: List all persons using the `list` command. Multiple persons in the list.
+    1. Prerequisites: List all persons using the `list` command. Multiple persons in the list.
 
-   1. Test case: `delete 1`<br>
-      Expected: First contact is deleted from the list. Details of the deleted contact shown in the status message. Timestamp in the status bar is updated.
+    1. Test case: `delete 1`<br>
+       Expected: First contact is deleted from the list. Details of the deleted contact shown in the status message. 
 
-   1. Test case: `delete 0`<br>
-      Expected: No person is deleted. Error details shown in the status message. Status bar remains the same.
+    1. Test case: `delete 0`<br>
+       Expected: No person is deleted. Error details shown in the status message.
 
-   1. Other incorrect delete commands to try: `delete`, `delete x`, `...` (where x is larger than the list size)<br>
-      Expected: Similar to previous.
+    1. Other incorrect delete commands to try: `delete`, `delete x`, `...` (where x is larger than the list size)<br>
+       Expected: Similar to previous.
 
-### Saving data
+### Finding a person
 
-1. Dealing with missing/corrupted data files
+1. Finding a person with tags
 
-   1. _{explain how to simulate a missing/corrupted file, and the expected behavior}_
+    1. Prerequisites: There are contacts in the contact list. Add some if this is not the case.
+    1. Assumption: Pick any 2 tags (or substring of the tags) present in any contact in the contact list. Call these x and y.
+    1. Test case: `find t/x` where `x` is the substring/tag chosen<br> 
+       Expected: All contacts with tags containing x will be displayed with a success message.
+    1. Test case: `find t/x t/y` where `x` and `y` are the substrings/tags chosen<br>
+       Expected: The contact(s) with tags containing x or y will be displayed with a success message.
 
+1. Finding a person with multiple fields
+    1. Prerequisites: There are contacts with tags in the contact list. Add some if this is not the case.
+    1. Assumption: Pick any name and tag within the same contact. Call these name x and tag y.
+    1. Test case: `find n/x t/y` where `x` and `y` are the name and tag chosen<br>
+       Expected: The contact(s) with name containing x and tags containing y will be displayed with a success message.
+
+1. Other incorrect find commands to try: `find`, `find x` (with no prefix)<br>
+   Expected: No filtering of contacts will occur and an error message will be displayed.
+
+### Deleting a tag from a person
+
+1. Deleting a tag.
+    1. Prerequisites: There are contacts with tags in the contact list. Add some if this is not the case.
+    1. Assumption: Pick any contact with at least one tag. Let `i` be the index (one-based) of this contact and `x` be the name of the tag.
+    1. Test case: `deltag i t/x` where `i` is the index and `x` is the tag chosen<br>
+       Expected: The tag x will be deleted from person i and the tag will also disappear from the Tag List. A success message will be displayed.
+
+1. Other incorrect delete tag commands to try: `deltag`, `deltag M t/x` (where M is larger than the list size or smaller than 0), `deltag 1 x`<br>
+   Expected: No deleting of tags will occur and an error message will be displayed.
+
 --------------------------------------------------------------------------------------------------------------------
 ## **Appendix: Future features**
 Below is a list of features that we feel would further enhance the user experience.