TEST: WASM: Add for string length

Author: ubaidsk

integration_tests/CMakeLists.txt

@@ -494,6 +494,7 @@ RUN(NAME test_types_02       LABELS cpython llvm c wasm)
 RUN(NAME test_str_01         LABELS cpython llvm c)
 RUN(NAME test_str_02         LABELS cpython llvm c)
 RUN(NAME test_str_03         LABELS cpython llvm c)
+RUN(NAME test_str_04         LABELS cpython llvm c wasm)
 RUN(NAME test_list_01        LABELS cpython llvm c)
 RUN(NAME test_list_02        LABELS cpython llvm c)
 RUN(NAME test_list_03        LABELS cpython llvm c NOFAST)

integration_tests/test_str_04.py

@@ -0,0 +1,11 @@
+def main0():
+    x: str
+    x = "abcdefghijkl"
+    print(len(x))
+    assert len(x) == 12
+
+    y: str = "123"
+    print(len(y))
+    assert len(y) == 3
+
+main0()