JS backend: fix tests after move testTrue and testFalse to common place

js/js.translator/testData/expression/string/cases/intInTemplate.kt

@@ -1,7 +1,10 @@
+// CHECK_NOT_CALLED_IN_SCOPE: scope=box function=toString
+
 package foo
 
 fun box(): String {
     var number = 3
-    return ("my age is $number");
+    assertEquals("my age is 3", "my age is $number")
+    return "OK"
 }
 

js/js.translator/testData/expression/string/cases/multipleExpressionsInTemplate.kt

@@ -1,8 +1,11 @@
+// CHECK_NOT_CALLED_IN_SCOPE: scope=box function=toString
+
 package foo
 
 fun box(): String {
     var right = 2
     var left = 3
-    return ("left = $left\nright = $right\nsum = ${left + right}\n");
+    assertEquals("left = 3\nright = 2\nsum = 5\n", "left = $left\nright = $right\nsum = ${left + right}\n");
+    return "OK"
 }
 

js/js.translator/testData/expression/string/cases/stringInTemplate.kt

@@ -1,7 +1,10 @@
+// CHECK_NOT_CALLED_IN_SCOPE: scope=box function=toString
+
 package foo
 
 fun box(): String {
     var name = "Hello"
-    return ("o${name}o");
+    assertEquals("oHelloo", "o${name}o")
+    return "OK";
 }