added 2 test showing that the emperor crocodile is destroyed afterward (shows that the effect is not treated as a oneshot)

and another that shows that it is destroyed immediately when entering an empty battlefield.

projects/mtg/bin/Res/test/Emperor Crocodile aslongas while tag 2.txt

@@ -0,0 +1,17 @@
+## Emperor Crocodile is sacrificed when it is put in play
+[INIT]
+FIRSTMAIN
+[PLAYER1]
+hand:Emperor Crocodile
+manapool:{3}{g}
+[PLAYER2]
+[DO]
+Emperor Crocodile
+[ASSERT]
+FIRSTMAIN
+[PLAYER1]
+graveyard:Emperor Crocodile
+manapool:{0}
+life:20
+[PLAYER2]
+[END]

projects/mtg/bin/Res/test/Emperor Crocodile aslongas while tag.txt

@@ -0,0 +1,19 @@
+## Emperor Crocodile is sacrificed when bottle gnomes is removed from battlefield
+[INIT]
+FIRSTMAIN
+[PLAYER1]
+hand:Emperor Crocodile
+inplay:Bottle Gnomes
+manapool:{3}{g}
+[PLAYER2]
+[DO]
+Emperor Crocodile
+Bottle Gnomes
+[ASSERT]
+FIRSTMAIN
+[PLAYER1]
+graveyard:Bottle Gnomes,Emperor Crocodile
+manapool:{0}
+life:23
+[PLAYER2]
+[END]

projects/mtg/bin/Res/test/_tests.txt

@@ -250,6 +250,8 @@ ekundu_cyclops2_i218.txt
 elvish_piper.txt
 elvish_promenade.txt
 emblem_of_the_warmind.txt
+Emperor Crocodile aslongas while tag.txt
+Emperor Crocodile aslongas while tag 2.txt
 enchanted evening.txt
 enervate.txt
 enchantress_s_presence.txt