Add create and read test case

go-owasm/src/span.rs

@@ -17,7 +17,7 @@ impl Span {
             cap: data.len(),
         }
     }
-
+    
     /// Read data from the span.
     pub fn read(&self) -> &[u8] {
         unsafe { std::slice::from_raw_parts(self.ptr, self.len) }
@@ -39,10 +39,24 @@ mod test {
     use super::*;
 
     #[test]
-    fn test_success_write_span_ok() {
-        let mut empty_space = vec![0u8; 32];
-        let mut span = Span{ ptr:  empty_space.as_mut_ptr(), len: 0, cap: 32 };
+    fn test_create_and_read_span_ok() {
+        let data: Vec<u8> = vec![1, 2, 3, 4, 5];
+        let span = Span::create(data.as_slice());
+        let span_data = &span.read();
+        let span_data_vec = span_data.to_vec();
+        assert_eq!(span_data_vec.len(), data.len());
+        assert_eq!(span_data_vec[0], data[0]);
+        assert_eq!(span_data_vec[1], data[1]);
+        assert_eq!(span_data_vec[2], data[2]);
+        assert_eq!(span_data_vec[3], data[3]);
+        assert_eq!(span_data_vec[4], data[4]);
+    }
 
+    #[test]
+    fn test_write_span_ok() {
+        let mut empty_space = vec![0u8; 32];
+        let mut span = Span{ ptr: empty_space.as_mut_ptr(), len: 0, cap: 32 };
+
         let data: Vec<u8> = vec![1, 2, 3, 4, 5];
         assert_eq!(span.write(data.as_slice()), Error::NoError);
         assert_eq!(span.len, 5);
@@ -59,13 +73,11 @@ mod test {
     }
 
     #[test]
-    fn test_success_write_span_fail() {
+    fn test_write_span_fail() {
         let mut empty_space = vec![0u8; 3];
         let mut span = Span{ ptr:  empty_space.as_mut_ptr(), len: 0, cap: 3 };
-
         let data: Vec<u8> = vec![1, 2, 3, 4, 5];
         span.write(data.as_slice());
-
         assert_eq!(span.write(data.as_slice()), Error::SpanExceededCapacityError);
     }
 }