Add manual verification tests for signature help

Co-authored-by: felix-andreas-copilot <[email protected]>

Author: Copilot

crates/roughly/tests/test_signature_help_manual.rs

@@ -0,0 +1,63 @@
+use roughly::{signature_help, tree, lsp_types::Position};
+use ropey::Rope;
+use std::collections::HashMap;
+
+#[test]
+fn manual_signature_help_test() {
+    let content = r#"sum(1, 2, 3)
+mean(c(1, 2, 3))
+plot(x, y)
+
+base::sum(1, 2)
+
+obj$method(arg1, arg2)
+
+sum(mean(x), median(y))
+
+sum(
+  1,
+  2,
+  3
+)"#;
+    
+    let rope = Rope::from_str(content);
+    let tree = tree::parse(&mut tree::new_parser(), content, None);
+    
+    // Test signature help at different positions
+    let test_cases = vec![
+        (0, 4),  // Inside sum(1, 2, 3) - first parameter
+        (0, 7),  // Inside sum(1, 2, 3) - second parameter  
+        (0, 10), // Inside sum(1, 2, 3) - third parameter
+        (1, 5),  // Inside mean(c(1, 2, 3)) - first parameter
+        (4, 11), // Inside base::sum(1, 2) - first parameter
+        (6, 4),  // Inside obj$method(arg1, arg2) - first parameter
+        (8, 4),  // Inside sum(mean(x), median(y)) - first parameter
+        (10, 2), // Inside multiline sum - first parameter
+        (11, 2), // Inside multiline sum - second parameter
+    ];
+    
+    for (line, character) in test_cases {
+        let position = Position::new(line, character);
+        let result = signature_help::get(position, &rope, &tree, &HashMap::new());
+        
+        println!("Position {line}:{character} -> {:?}", result.as_ref().map(|s| (s.signatures[0].label.clone(), s.active_parameter)));
+        
+        // Basic assertions
+        if line == 0 && character == 4 {
+            assert!(result.is_some());
+            let sig = result.unwrap();
+            assert_eq!(sig.signatures[0].label, "sum(...)");
+            assert_eq!(sig.active_parameter, Some(0));
+        } else if line == 0 && character == 7 {
+            assert!(result.is_some());
+            let sig = result.unwrap();
+            assert_eq!(sig.signatures[0].label, "sum(...)");
+            assert_eq!(sig.active_parameter, Some(1));
+        } else if line == 4 && character == 11 {
+            assert!(result.is_some());
+            let sig = result.unwrap();
+            assert_eq!(sig.signatures[0].label, "sum(...)");
+            assert_eq!(sig.active_parameter, Some(0));
+        }
+    }
+}

examples/test_signature_help.rs

@@ -0,0 +1,29 @@
+use roughly::{signature_help, tree, lsp_types::Position};
+use ropey::Rope;
+use std::collections::HashMap;
+
+fn main() {
+    let content = std::fs::read_to_string("/tmp/test_signature_help.R").unwrap();
+    let rope = Rope::from_str(&content);
+    let tree = tree::parse(&mut tree::new_parser(), &content, None);
+    
+    // Test signature help at different positions
+    let test_cases = vec![
+        (0, 4),  // Inside sum(1, 2, 3) - first parameter
+        (0, 7),  // Inside sum(1, 2, 3) - second parameter  
+        (0, 10), // Inside sum(1, 2, 3) - third parameter
+        (1, 5),  // Inside mean(c(1, 2, 3)) - first parameter
+        (4, 11), // Inside base::sum(1, 2) - first parameter
+        (7, 4),  // Inside obj$method(arg1, arg2) - first parameter
+        (10, 4), // Inside sum(mean(x), median(y)) - first parameter
+        (13, 2), // Inside multiline sum - first parameter
+        (14, 2), // Inside multiline sum - second parameter
+    ];
+    
+    for (line, character) in test_cases {
+        let position = Position::new(line, character);
+        let result = signature_help::get(position, &rope, &tree, &HashMap::new());
+        
+        println!("Position {line}:{character} -> {:?}", result.map(|s| (s.signatures[0].label.clone(), s.active_parameter)));
+    }
+}