add test

Cargo.toml

@@ -62,3 +62,5 @@ yansi = "1.0"
 # async
 futures-util = "0.3"
 tokio = { version = "1.35", features = ["rt-multi-thread"] }
+
+snapbox = "0.6.9"

crates/compilers/Cargo.toml

@@ -61,6 +61,7 @@ fd-lock = "4.0.0"
 tokio = { version = "1.35", features = ["rt-multi-thread", "macros"] }
 reqwest = "0.12"
 tempfile = "3.9"
+snapbox.workspace = true
 foundry-compilers-core = { workspace = true, features = ["test-utils"] }
 
 [features]

crates/compilers/src/resolver/mod.rs

@@ -560,7 +560,7 @@ impl<L: Language, D: ParsedSource<Language = L>> Graph<D> {
                 line.push_str(&format!(" {req}"));
             }
 
-            write!(f, "{} ", line.paint(color))
+            write!(f, "{}", line.paint(color))
         };
         format_node(idx, f)?;
         write!(f, " imports:")?;
@@ -1052,6 +1052,32 @@ src/Dapp.t.sol >=0.6.6
         );
     }
 
+    #[test]
+    #[cfg(feature = "svm-solc")]
+    fn test_print_unresolved() {
+        let root =
+            Path::new(env!("CARGO_MANIFEST_DIR")).join("../../test-data/incompatible-pragmas");
+        let paths = ProjectPathsConfig::dapptools(&root).unwrap();
+        let graph = Graph::<SolData>::resolve(&paths).unwrap();
+        let Err(SolcError::Message(err)) = graph.get_input_node_versions(
+            false,
+            &Default::default(),
+            &crate::solc::SolcCompiler::AutoDetect,
+        ) else {
+            panic!("expected error");
+        };
+
+        snapbox::assert_data_eq!(
+            err,
+            snapbox::str![[r#"
+Found incompatible versions:
+src/A.sol =0.8.25 imports:
+    src/B.sol
+    src/C.sol =0.7.0
+"#]]
+        );
+    }
+
     #[cfg(target_os = "linux")]
     #[test]
     fn can_read_different_case() {

test-data/incompatible-pragmas/src/A.sol

@@ -0,0 +1,3 @@
+pragma solidity 0.8.25;
+
+import "./B.sol";

test-data/incompatible-pragmas/src/B.sol

@@ -0,0 +1 @@
+import "./C.sol";

test-data/incompatible-pragmas/src/C.sol

@@ -0,0 +1 @@
+pragma solidity 0.7.0;