improve coverage

src/main.rs

@@ -333,6 +333,12 @@ fn parse_arguments(args: &Vec<String>) -> Result<(String, String), anyhow::Error
     let default_output_name = String::from("no_wasi.wasm");
     let output_wasm = args.get(2).unwrap_or(&default_output_name);
 
+    log::info!(
+        "Processing input file: '{}', writing output into '{}'",
+        input_wasm,
+        output_wasm
+    );
+
     Ok((input_wasm.clone(), output_wasm.clone()))
 }
 
@@ -343,12 +349,6 @@ fn main() -> anyhow::Result<()> {
 
     let (input_wasm, output_wasm) = parse_arguments(&args)?;
 
-    log::info!(
-        "Processing input file: '{}', writing output into '{}'",
-        input_wasm,
-        output_wasm
-    );
-
     do_wasm_file_processing(Path::new(&input_wasm), Path::new(&output_wasm))?;
 
     Ok(())

src/tests.rs

@@ -179,6 +179,12 @@ fn test_do_module_replacements() {
         
         (table (;0;) 5 5 funcref)
         (elem (;0;) (i32.const 1) func $_wasi_snapshot_preview_fd_write $_wasi_snapshot_preview_random_get )
+        
+        (memory (export "memory") 1 100)
+
+        (data (i32.const 0x0000)
+            "\65\66\67\68"
+        )
 
         (func $_start (;6;) (type 0)
             i32.const 1
@@ -327,3 +333,12 @@ fn test_argument_parsing_one_input_with_default_output() {
     assert_eq!("input.wasm", input_wasm);
     assert_eq!("no_wasi.wasm", output_wasm);
 }
+
+#[test]
+fn test_empty_input_arguments() {
+    let args = vec![];
+
+    let result = parse_arguments(&args);
+
+    assert!(result.is_err());
+}