Add parser test

src/main/java/seedu/address/logic/commands/ViewCommand.java

@@ -49,6 +49,19 @@ public CommandResult execute(Model model) throws CommandException {
         logger.info("Client to View: " + personToView);
         return new CommandResult(MESSAGE_SUCCESS);
     }
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+
+        if (other == null || getClass() != other.getClass()) {
+            return false;
+        }
+
+        ViewCommand that = (ViewCommand) other;
 
+        return targetIndex.equals(that.targetIndex);
+    }
 }
 

src/test/java/seedu/address/logic/parser/ViewCommandParserTest.java

@@ -0,0 +1,24 @@
+package seedu.address.logic.parser;
+
+import static seedu.address.logic.Messages.MESSAGE_INVALID_COMMAND_FORMAT;
+import static seedu.address.logic.parser.CommandParserTestUtil.assertParseFailure;
+import static seedu.address.logic.parser.CommandParserTestUtil.assertParseSuccess;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.core.index.Index;
+import seedu.address.logic.commands.ViewCommand;
+public class ViewCommandParserTest {
+    private ViewCommandParser parser = new ViewCommandParser();
+
+    @Test
+    public void parse_emptyArg_throwsParseException() {
+        assertParseFailure(parser, "     ", String.format(MESSAGE_INVALID_COMMAND_FORMAT, ViewCommand.MESSAGE_USAGE));
+    }
+    @Test
+    public void parse_validArgs_returnsViewCommand() {
+        ViewCommand expectedViewCommand = new ViewCommand(Index.fromOneBased(2));
+        assertParseSuccess(parser, "2", expectedViewCommand);
+    }
+
+}