Add test with standard json args

crates/solidity/src/solc/standard_json/input/mod.rs

@@ -12,6 +12,8 @@ use std::path::PathBuf;
 use rayon::iter::{IntoParallelIterator, ParallelIterator};
 use serde::Deserialize;
 use serde::Serialize;
+#[cfg(target_os = "emscripten")]
+use std::fs::File;
 
 use crate::solc::pipeline::Pipeline as SolcPipeline;
 use crate::solc::standard_json::input::settings::metadata::Metadata as SolcStandardJsonInputSettingsMetadata;
@@ -41,7 +43,20 @@ pub struct Input {
 impl Input {
     /// A shortcut constructor from stdin.
     pub fn try_from_stdin(solc_pipeline: SolcPipeline) -> anyhow::Result<Self> {
-        let mut input: Self = serde_json::from_reader(std::io::BufReader::new(std::io::stdin()))?;
+        let mut input: Self = serde_json::from_reader({
+            #[cfg(target_os = "emscripten")]
+            {
+                std::io::BufReader::new(
+                    File::open("/in")
+                        .map_err(|error| anyhow::anyhow!("File /in openning error: {}", error))?,
+                )
+            }
+            #[cfg(not(target_os = "emscripten"))]
+            {
+                std::io::BufReader::new(std::io::stdin())
+            }
+        })?;
+
         input
             .settings
             .output_selection