internal: Refactor / clean up hir_ty tests

crates/hir_ty/src/chalk_db.rs

@@ -2,6 +2,7 @@
 //! about the code that Chalk needs.
 use std::sync::Arc;
 
+use cov_mark::hit;
 use log::debug;
 
 use chalk_ir::{cast::Cast, fold::shift::Shift, CanonicalVarKinds};
@@ -106,7 +107,9 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
         };
 
         fn local_impls(db: &dyn HirDatabase, module: ModuleId) -> Option<Arc<TraitImpls>> {
-            db.trait_impls_in_block(module.containing_block()?)
+            let block = module.containing_block()?;
+            hit!(block_local_impls);
+            db.trait_impls_in_block(block)
         }
 
         // Note: Since we're using impls_for_trait, only impls where the trait

crates/hir_ty/src/test_db.rs

@@ -86,16 +86,20 @@ impl FileLoader for TestDB {
 }
 
 impl TestDB {
-    pub(crate) fn module_for_file(&self, file_id: FileId) -> ModuleId {
+    pub(crate) fn module_for_file_opt(&self, file_id: FileId) -> Option<ModuleId> {
         for &krate in self.relevant_crates(file_id).iter() {
             let crate_def_map = self.crate_def_map(krate);
             for (local_id, data) in crate_def_map.modules() {
                 if data.origin.file_id() == Some(file_id) {
-                    return crate_def_map.module_id(local_id);
+                    return Some(crate_def_map.module_id(local_id));
                 }
             }
         }
-        panic!("Can't find module for file")
+        None
+    }
+
+    pub(crate) fn module_for_file(&self, file_id: FileId) -> ModuleId {
+        self.module_for_file_opt(file_id).unwrap()
     }
 
     pub(crate) fn extract_annotations(&self) -> FxHashMap<FileId, Vec<(TextRange, String)>> {

crates/hir_ty/src/tests.rs

@@ -11,23 +11,21 @@ mod incremental;
 
 use std::{collections::HashMap, env, sync::Arc};
 
-use base_db::{fixture::WithFixture, FileRange, SourceDatabase, SourceDatabaseExt};
+use base_db::{fixture::WithFixture, FileRange, SourceDatabaseExt};
 use expect_test::Expect;
 use hir_def::{
     body::{Body, BodySourceMap, SyntheticSyntax},
-    child_by_source::ChildBySource,
     db::DefDatabase,
+    expr::{ExprId, PatId},
     item_scope::ItemScope,
-    keys,
     nameres::DefMap,
     src::HasSource,
-    AssocItemId, DefWithBodyId, LocalModuleId, Lookup, ModuleDefId,
+    AssocItemId, DefWithBodyId, HasModule, LocalModuleId, Lookup, ModuleDefId,
 };
 use hir_expand::{db::AstDatabase, InFile};
 use once_cell::race::OnceBool;
 use stdx::format_to;
 use syntax::{
-    algo,
     ast::{self, AstNode, NameOwner},
     SyntaxNode,
 };
@@ -59,51 +57,55 @@ fn setup_tracing() -> Option<tracing::subscriber::DefaultGuard> {
 }
 
 fn check_types(ra_fixture: &str) {
-    check_types_impl(ra_fixture, false)
+    check_impl(ra_fixture, false, true, false)
 }
 
 fn check_types_source_code(ra_fixture: &str) {
-    check_types_impl(ra_fixture, true)
-}
-
-fn check_types_impl(ra_fixture: &str, display_source: bool) {
-    let _tracing = setup_tracing();
-    let db = TestDB::with_files(ra_fixture);
-    let mut checked_one = false;
-    for (file_id, annotations) in db.extract_annotations() {
-        for (range, expected) in annotations {
-            let ty = type_at_range(&db, FileRange { file_id, range });
-            let actual = if display_source {
-                let module = db.module_for_file(file_id);
-                ty.display_source_code(&db, module).unwrap()
-            } else {
-                ty.display_test(&db).to_string()
-            };
-            assert_eq!(expected, actual);
-            checked_one = true;
-        }
-    }
-
-    assert!(checked_one, "no `//^` annotations found");
+    check_impl(ra_fixture, false, true, true)
 }
 
 fn check_no_mismatches(ra_fixture: &str) {
-    check_mismatches_impl(ra_fixture, true)
+    check_impl(ra_fixture, true, false, false)
 }
 
-#[allow(unused)]
-fn check_mismatches(ra_fixture: &str) {
-    check_mismatches_impl(ra_fixture, false)
+fn check(ra_fixture: &str) {
+    check_impl(ra_fixture, false, false, false)
 }
 
-fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
+fn check_impl(ra_fixture: &str, allow_none: bool, only_types: bool, display_source: bool) {
     let _tracing = setup_tracing();
-    let (db, file_id) = TestDB::with_single_file(ra_fixture);
-    let module = db.module_for_file(file_id);
-    let def_map = module.def_map(&db);
+    let (db, files) = TestDB::with_many_files(ra_fixture);
+
+    let mut had_annotations = false;
+    let mut mismatches = HashMap::new();
+    let mut types = HashMap::new();
+    for (file_id, annotations) in db.extract_annotations() {
+        for (range, expected) in annotations {
+            let file_range = FileRange { file_id, range };
+            if only_types {
+                types.insert(file_range, expected);
+            } else if expected.starts_with("type: ") {
+                types.insert(file_range, expected.trim_start_matches("type: ").to_string());
+            } else if expected.starts_with("expected") {
+                mismatches.insert(file_range, expected);
+            } else {
+                panic!("unexpected annotation: {}", expected);
+            }
+            had_annotations = true;
+        }
+    }
+    assert!(had_annotations || allow_none, "no `//^` annotations found");
 
     let mut defs: Vec<DefWithBodyId> = Vec::new();
-    visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
+    for file_id in files {
+        let module = db.module_for_file_opt(file_id);
+        let module = match module {
+            Some(m) => m,
+            None => continue,
+        };
+        let def_map = module.def_map(&db);
+        visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
+    }
     defs.sort_by_key(|def| match def {
         DefWithBodyId::FunctionId(it) => {
             let loc = it.lookup(&db);
@@ -118,37 +120,59 @@ fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
             loc.source(&db).value.syntax().text_range().start()
         }
     });
-    let mut mismatches = HashMap::new();
-    let mut push_mismatch = |src_ptr: InFile<SyntaxNode>, mismatch: TypeMismatch| {
-        let range = src_ptr.value.text_range();
-        if src_ptr.file_id.call_node(&db).is_some() {
-            panic!("type mismatch in macro expansion");
-        }
-        let file_range = FileRange { file_id: src_ptr.file_id.original_file(&db), range };
-        let actual = format!(
-            "expected {}, got {}",
-            mismatch.expected.display_test(&db),
-            mismatch.actual.display_test(&db)
-        );
-        mismatches.insert(file_range, actual);
-    };
+    let mut unexpected_type_mismatches = String::new();
     for def in defs {
         let (_body, body_source_map) = db.body_with_source_map(def);
         let inference_result = db.infer(def);
+
+        for (pat, ty) in inference_result.type_of_pat.iter() {
+            let node = match pat_node(&body_source_map, pat, &db) {
+                Some(value) => value,
+                None => continue,
+            };
+            let range = node.as_ref().original_file_range(&db);
+            if let Some(expected) = types.remove(&range) {
+                let actual = if display_source {
+                    ty.display_source_code(&db, def.module(&db)).unwrap()
+                } else {
+                    ty.display_test(&db).to_string()
+                };
+                assert_eq!(actual, expected);
+            }
+        }
+
+        for (expr, ty) in inference_result.type_of_expr.iter() {
+            let node = match expr_node(&body_source_map, expr, &db) {
+                Some(value) => value,
+                None => continue,
+            };
+            let range = node.as_ref().original_file_range(&db);
+            if let Some(expected) = types.remove(&range) {
+                let actual = if display_source {
+                    ty.display_source_code(&db, def.module(&db)).unwrap()
+                } else {
+                    ty.display_test(&db).to_string()
+                };
+                assert_eq!(actual, expected);
+            }
+        }
+
         for (pat, mismatch) in inference_result.pat_type_mismatches() {
-            let syntax_ptr = match body_source_map.pat_syntax(pat) {
-                Ok(sp) => {
-                    let root = db.parse_or_expand(sp.file_id).unwrap();
-                    sp.map(|ptr| {
-                        ptr.either(
-                            |it| it.to_node(&root).syntax().clone(),
-                            |it| it.to_node(&root).syntax().clone(),
-                        )
-                    })
-                }
-                Err(SyntheticSyntax) => continue,
+            let node = match pat_node(&body_source_map, pat, &db) {
+                Some(value) => value,
+                None => continue,
             };
-            push_mismatch(syntax_ptr, mismatch.clone());
+            let range = node.as_ref().original_file_range(&db);
+            let actual = format!(
+                "expected {}, got {}",
+                mismatch.expected.display_test(&db),
+                mismatch.actual.display_test(&db)
+            );
+            if let Some(annotation) = mismatches.remove(&range) {
+                assert_eq!(actual, annotation);
+            } else {
+                format_to!(unexpected_type_mismatches, "{:?}: {}\n", range.range, actual);
+            }
         }
         for (expr, mismatch) in inference_result.expr_type_mismatches() {
             let node = match body_source_map.expr_syntax(expr) {
@@ -158,45 +182,70 @@ fn check_mismatches_impl(ra_fixture: &str, allow_none: bool) {
                 }
                 Err(SyntheticSyntax) => continue,
             };
-            push_mismatch(node, mismatch.clone());
-        }
-    }
-    let mut checked_one = false;
-    for (file_id, annotations) in db.extract_annotations() {
-        for (range, expected) in annotations {
-            let file_range = FileRange { file_id, range };
-            if let Some(mismatch) = mismatches.remove(&file_range) {
-                assert_eq!(mismatch, expected);
+            let range = node.as_ref().original_file_range(&db);
+            let actual = format!(
+                "expected {}, got {}",
+                mismatch.expected.display_test(&db),
+                mismatch.actual.display_test(&db)
+            );
+            if let Some(annotation) = mismatches.remove(&range) {
+                assert_eq!(actual, annotation);
             } else {
-                assert!(false, "Expected mismatch not encountered: {}\n", expected);
+                format_to!(unexpected_type_mismatches, "{:?}: {}\n", range.range, actual);
             }
-            checked_one = true;
         }
     }
+
     let mut buf = String::new();
-    for (range, mismatch) in mismatches {
-        format_to!(buf, "{:?}: {}\n", range.range, mismatch,);
+    if !unexpected_type_mismatches.is_empty() {
+        format_to!(buf, "Unexpected type mismatches:\n{}", unexpected_type_mismatches);
+    }
+    if !mismatches.is_empty() {
+        format_to!(buf, "Unchecked mismatch annotations:\n");
+        for m in mismatches {
+            format_to!(buf, "{:?}: {}\n", m.0.range, m.1);
+        }
     }
-    assert!(buf.is_empty(), "Unexpected type mismatches:\n{}", buf);
+    if !types.is_empty() {
+        format_to!(buf, "Unchecked type annotations:\n");
+        for t in types {
+            format_to!(buf, "{:?}: type {}\n", t.0.range, t.1);
+        }
+    }
+    assert!(buf.is_empty(), "{}", buf);
+}
 
-    assert!(checked_one || allow_none, "no `//^` annotations found");
+fn expr_node(
+    body_source_map: &BodySourceMap,
+    expr: ExprId,
+    db: &TestDB,
+) -> Option<InFile<SyntaxNode>> {
+    Some(match body_source_map.expr_syntax(expr) {
+        Ok(sp) => {
+            let root = db.parse_or_expand(sp.file_id).unwrap();
+            sp.map(|ptr| ptr.to_node(&root).syntax().clone())
+        }
+        Err(SyntheticSyntax) => return None,
+    })
 }
 
-fn type_at_range(db: &TestDB, pos: FileRange) -> Ty {
-    let file = db.parse(pos.file_id).ok().unwrap();
-    let expr = algo::find_node_at_range::<ast::Expr>(file.syntax(), pos.range).unwrap();
-    let fn_def = expr.syntax().ancestors().find_map(ast::Fn::cast).unwrap();
-    let module = db.module_for_file(pos.file_id);
-    let func = *module.child_by_source(db)[keys::FUNCTION]
-        .get(&InFile::new(pos.file_id.into(), fn_def))
-        .unwrap();
-
-    let (_body, source_map) = db.body_with_source_map(func.into());
-    if let Some(expr_id) = source_map.node_expr(InFile::new(pos.file_id.into(), &expr)) {
-        let infer = db.infer(func.into());
-        return infer[expr_id].clone();
-    }
-    panic!("Can't find expression")
+fn pat_node(
+    body_source_map: &BodySourceMap,
+    pat: PatId,
+    db: &TestDB,
+) -> Option<InFile<SyntaxNode>> {
+    Some(match body_source_map.pat_syntax(pat) {
+        Ok(sp) => {
+            let root = db.parse_or_expand(sp.file_id).unwrap();
+            sp.map(|ptr| {
+                ptr.either(
+                    |it| it.to_node(&root).syntax().clone(),
+                    |it| it.to_node(&root).syntax().clone(),
+                )
+            })
+        }
+        Err(SyntheticSyntax) => return None,
+    })
 }
 
 fn infer(ra_fixture: &str) -> String {