Fix compile warning, follow Solidity code style

https://solidity.readthedocs.io/en/latest/style-guide.html

src/app/tabs/test-tab.js

@@ -199,8 +199,8 @@ import "remix_tests.sol"; // this import is automatically injected by Remix.
 // file name has to end with '_test.sol'
 contract test_1 {
     
-    function beforeAll () {
-      // here should instanciate tested contract
+    function beforeAll() public {
+      // here should instantiate tested contract
     }
     
     function check1() public {
@@ -217,8 +217,8 @@ contract test_1 {
 
 contract test_2 {
    
-    function beforeAll () {
-      // here should instanciate tested contract
+    function beforeAll() public {
+      // here should instantiate tested contract
     }
     
     function check1() public {