Add tests for various forms of `loadVariables`.

Surprisingly enough these tests passed without any changes, somehow.

core/tests/regression_tests.rs

@@ -169,6 +169,9 @@ swf_tests! {
     (mcl_loadclip, "avm1/mcl_loadclip", 11),
     (mcl_unloadclip, "avm1/mcl_unloadclip", 11),
     (mcl_getprogress, "avm1/mcl_getprogress", 6),
+    (loadvariables, "avm1/loadvariables", 3),
+    (loadvariablesnum, "avm1/loadvariablesnum", 3),
+    (loadvariables_method, "avm1/loadvariables_method", 3),
 }
 
 // TODO: These tests have some inaccuracies currently, so we use approx_eq to test that numeric values are close enough.

core/tests/swfs/avm1/loadvariables/output.txt

@@ -0,0 +1,2 @@
+Hurray
+The test passed

core/tests/swfs/avm1/loadvariables/testvars.txt

@@ -0,0 +1 @@
+loaded=Hurray&also=The%20test%20passed

core/tests/swfs/avm1/loadvariables_method/output.txt

@@ -0,0 +1,2 @@
+Hurray
+The test passed

core/tests/swfs/avm1/loadvariables_method/testvars.txt

@@ -0,0 +1 @@
+loaded=Hurray&also=The%20test%20passed

core/tests/swfs/avm1/loadvariablesnum/output.txt

@@ -0,0 +1,2 @@
+Hurray
+The test passed

core/tests/swfs/avm1/loadvariablesnum/testvars.txt

@@ -0,0 +1 @@
+loaded=Hurray&also=The%20test%20passed