Move test_utils into tests module

26 files changed, 194 insertions, 238 deletions

diff --git a/crates/ide_completion/src/completions/attribute.rs b/crates/ide_completion/src/completions/attribute.rs
index 6df569c2a..3866c5917 100644
--- a/crates/ide_completion/src/completions/attribute.rs
+++ b/crates/ide_completion/src/completions/attribute.rs
@@ -322,7 +322,7 @@ mod tests {
 
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
 
     #[test]
     fn attributes_are_sorted() {
@@ -341,7 +341,7 @@ mod tests {
     }
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Attribute);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Attribute);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/attribute/derive.rs b/crates/ide_completion/src/completions/attribute/derive.rs
index 20bbbba46..5201095e8 100644
--- a/crates/ide_completion/src/completions/attribute/derive.rs
+++ b/crates/ide_completion/src/completions/attribute/derive.rs
@@ -82,7 +82,7 @@ const DEFAULT_DERIVE_COMPLETIONS: &[DeriveDependencies] = &[
 mod tests {
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
 
     fn check(ra_fixture: &str, expect: Expect) {
         let builtin_derives = r#"
@@ -106,7 +106,7 @@ pub macro PartialOrd {}
 pub macro Ord {}
 
 "#;
-        let actual = completion_list(
+        let actual = filtered_completion_list(
             &format!("{} {}", builtin_derives, ra_fixture),
             CompletionKind::Attribute,
         );
diff --git a/crates/ide_completion/src/completions/attribute/lint.rs b/crates/ide_completion/src/completions/attribute/lint.rs
index ca99e9759..4812b075c 100644
--- a/crates/ide_completion/src/completions/attribute/lint.rs
+++ b/crates/ide_completion/src/completions/attribute/lint.rs
@@ -34,7 +34,7 @@ pub(super) fn complete_lint(
 #[cfg(test)]
 mod tests {
 
-    use crate::test_utils::check_edit;
+    use crate::tests::check_edit;
 
     #[test]
     fn check_empty() {
diff --git a/crates/ide_completion/src/completions/dot.rs b/crates/ide_completion/src/completions/dot.rs
index 9552875c1..7f75d4298 100644
--- a/crates/ide_completion/src/completions/dot.rs
+++ b/crates/ide_completion/src/completions/dot.rs
@@ -101,10 +101,10 @@ fn complete_methods(
 mod tests {
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Reference);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/flyimport.rs b/crates/ide_completion/src/completions/flyimport.rs
index 30b8d44bd..4604feb5d 100644
--- a/crates/ide_completion/src/completions/flyimport.rs
+++ b/crates/ide_completion/src/completions/flyimport.rs
@@ -227,11 +227,11 @@ mod tests {
 
     use crate::{
         item::CompletionKind,
-        test_utils::{check_edit, check_edit_with_config, completion_list, TEST_CONFIG},
+        tests::{check_edit, check_edit_with_config, filtered_completion_list, TEST_CONFIG},
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Magic);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Magic);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/fn_param.rs b/crates/ide_completion/src/completions/fn_param.rs
index cb90e8a3e..c9f0e2473 100644
--- a/crates/ide_completion/src/completions/fn_param.rs
+++ b/crates/ide_completion/src/completions/fn_param.rs
@@ -64,10 +64,10 @@ pub(crate) fn complete_fn_param(acc: &mut Completions, ctx: &CompletionContext)
 mod tests {
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Magic);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Magic);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/keyword.rs b/crates/ide_completion/src/completions/keyword.rs
index 0a3df79d4..73bbc4345 100644
--- a/crates/ide_completion/src/completions/keyword.rs
+++ b/crates/ide_completion/src/completions/keyword.rs
@@ -190,12 +190,12 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list},
+        tests::{check_edit, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Keyword);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Keyword);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/lifetime.rs b/crates/ide_completion/src/completions/lifetime.rs
index 8ccccb646..36f595164 100644
--- a/crates/ide_completion/src/completions/lifetime.rs
+++ b/crates/ide_completion/src/completions/lifetime.rs
@@ -50,7 +50,7 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list_with_config, TEST_CONFIG},
+        tests::{check_edit, filtered_completion_list_with_config, TEST_CONFIG},
         CompletionConfig, CompletionKind,
     };
 
@@ -59,7 +59,8 @@ mod tests {
     }
 
     fn check_with_config(config: CompletionConfig, ra_fixture: &str, expect: Expect) {
-        let actual = completion_list_with_config(config, ra_fixture, CompletionKind::Reference);
+        let actual =
+            filtered_completion_list_with_config(config, ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/mod_.rs b/crates/ide_completion/src/completions/mod_.rs
index 6a5746fb9..5def0d06a 100644
--- a/crates/ide_completion/src/completions/mod_.rs
+++ b/crates/ide_completion/src/completions/mod_.rs
@@ -141,11 +141,11 @@ fn module_chain_to_containing_module_file(
 
 #[cfg(test)]
 mod tests {
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
     use expect_test::{expect, Expect};
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Magic);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Magic);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/pattern.rs b/crates/ide_completion/src/completions/pattern.rs
index e45b2a1ea..efe3c957a 100644
--- a/crates/ide_completion/src/completions/pattern.rs
+++ b/crates/ide_completion/src/completions/pattern.rs
@@ -61,17 +61,17 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list},
+        tests::{check_edit, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Reference);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual)
     }
 
     fn check_snippet(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Snippet);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Snippet);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/postfix.rs b/crates/ide_completion/src/completions/postfix.rs
index 9f98b21be..c3c7e4589 100644
--- a/crates/ide_completion/src/completions/postfix.rs
+++ b/crates/ide_completion/src/completions/postfix.rs
@@ -307,12 +307,12 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list},
+        tests::{check_edit, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Postfix);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Postfix);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/qualified_path.rs b/crates/ide_completion/src/completions/qualified_path.rs
index 165b9e6a5..9432caa22 100644
--- a/crates/ide_completion/src/completions/qualified_path.rs
+++ b/crates/ide_completion/src/completions/qualified_path.rs
@@ -198,17 +198,17 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list},
+        tests::{check_edit, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Reference);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual);
     }
 
     fn check_builtin(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::BuiltinType);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::BuiltinType);
         expect.assert_eq(&actual);
     }
 
diff --git a/crates/ide_completion/src/completions/record.rs b/crates/ide_completion/src/completions/record.rs
index 0ac47cdbe..47523f72f 100644
--- a/crates/ide_completion/src/completions/record.rs
+++ b/crates/ide_completion/src/completions/record.rs
@@ -51,17 +51,17 @@ mod tests {
     use ide_db::helpers::FamousDefs;
 
     use crate::{
-        test_utils::{self, completion_list},
+        tests::{self, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Reference);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual);
     }
 
     fn check_snippet(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(
+        let actual = filtered_completion_list(
             &format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE),
             CompletionKind::Snippet,
         );
@@ -69,7 +69,7 @@ mod tests {
     }
 
     fn check_edit(what: &str, ra_fixture_before: &str, ra_fixture_after: &str) {
-        test_utils::check_edit(
+        tests::check_edit(
             what,
             &format!(
                 "//- /main.rs crate:main deps:core{}\n{}",
diff --git a/crates/ide_completion/src/completions/snippet.rs b/crates/ide_completion/src/completions/snippet.rs
index d142265e0..81ddfa34f 100644
--- a/crates/ide_completion/src/completions/snippet.rs
+++ b/crates/ide_completion/src/completions/snippet.rs
@@ -87,10 +87,10 @@ fn ${1:feature}() {
 mod tests {
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{tests::filtered_completion_list, CompletionKind};
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Snippet);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Snippet);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/trait_impl.rs b/crates/ide_completion/src/completions/trait_impl.rs
index a60e5f43c..dc1d198cc 100644
--- a/crates/ide_completion/src/completions/trait_impl.rs
+++ b/crates/ide_completion/src/completions/trait_impl.rs
@@ -246,12 +246,12 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list},
+        tests::{check_edit, filtered_completion_list},
         CompletionKind,
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
-        let actual = completion_list(ra_fixture, CompletionKind::Magic);
+        let actual = filtered_completion_list(ra_fixture, CompletionKind::Magic);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/completions/unqualified_path.rs b/crates/ide_completion/src/completions/unqualified_path.rs
index 3910de2c4..2868d9b18 100644
--- a/crates/ide_completion/src/completions/unqualified_path.rs
+++ b/crates/ide_completion/src/completions/unqualified_path.rs
@@ -93,7 +93,7 @@ mod tests {
     use expect_test::{expect, Expect};
 
     use crate::{
-        test_utils::{check_edit, completion_list_with_config, TEST_CONFIG},
+        tests::{check_edit, filtered_completion_list_with_config, TEST_CONFIG},
         CompletionConfig, CompletionKind,
     };
 
@@ -102,7 +102,8 @@ mod tests {
     }
 
     fn check_with_config(config: CompletionConfig, ra_fixture: &str, expect: Expect) {
-        let actual = completion_list_with_config(config, ra_fixture, CompletionKind::Reference);
+        let actual =
+            filtered_completion_list_with_config(config, ra_fixture, CompletionKind::Reference);
         expect.assert_eq(&actual)
     }
 
diff --git a/crates/ide_completion/src/context.rs b/crates/ide_completion/src/context.rs
index 441c080b1..121909857 100644
--- a/crates/ide_completion/src/context.rs
+++ b/crates/ide_completion/src/context.rs
@@ -695,7 +695,7 @@ mod tests {
     use expect_test::{expect, Expect};
     use hir::HirDisplay;
 
-    use crate::test_utils::{position, TEST_CONFIG};
+    use crate::tests::{position, TEST_CONFIG};
 
     use super::CompletionContext;
 
diff --git a/crates/ide_completion/src/lib.rs b/crates/ide_completion/src/lib.rs
index be6442426..bf73818dc 100644
--- a/crates/ide_completion/src/lib.rs
+++ b/crates/ide_completion/src/lib.rs
@@ -9,8 +9,6 @@ mod render;
 
 #[cfg(test)]
 mod tests;
-#[cfg(test)]
-mod test_utils;
 
 use completions::flyimport::position_for_import;
 use ide_db::{
diff --git a/crates/ide_completion/src/patterns.rs b/crates/ide_completion/src/patterns.rs
index 02cfe91e1..62e4334de 100644
--- a/crates/ide_completion/src/patterns.rs
+++ b/crates/ide_completion/src/patterns.rs
@@ -11,7 +11,7 @@ use syntax::{
 };
 
 #[cfg(test)]
-use crate::test_utils::{check_pattern_is_applicable, check_pattern_is_not_applicable};
+use crate::tests::{check_pattern_is_applicable, check_pattern_is_not_applicable};
 
 /// Immediate previous node to what we are completing.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -324,7 +324,7 @@ fn previous_non_trivia_token(token: SyntaxToken) -> Option<SyntaxToken> {
 mod tests {
     use syntax::algo::find_node_at_offset;
 
-    use crate::test_utils::position;
+    use crate::tests::position;
 
     use super::*;
 
diff --git a/crates/ide_completion/src/render.rs b/crates/ide_completion/src/render.rs
index 2bd2c44d0..4b55f7504 100644
--- a/crates/ide_completion/src/render.rs
+++ b/crates/ide_completion/src/render.rs
@@ -335,7 +335,7 @@ mod tests {
 
     use crate::{
         item::CompletionRelevanceTypeMatch,
-        test_utils::{check_edit, do_completion, get_all_items, TEST_CONFIG},
+        tests::{check_edit, do_completion, get_all_items, TEST_CONFIG},
         CompletionKind, CompletionRelevance,
     };
 
diff --git a/crates/ide_completion/src/render/enum_variant.rs b/crates/ide_completion/src/render/enum_variant.rs
index 28f056e77..91dc178f3 100644
--- a/crates/ide_completion/src/render/enum_variant.rs
+++ b/crates/ide_completion/src/render/enum_variant.rs
@@ -121,7 +121,7 @@ impl<'a> EnumRender<'a> {
 
 #[cfg(test)]
 mod tests {
-    use crate::test_utils::check_edit;
+    use crate::tests::check_edit;
 
     #[test]
     fn inserts_parens_for_tuple_enums() {
diff --git a/crates/ide_completion/src/render/function.rs b/crates/ide_completion/src/render/function.rs
index 1357b9f4a..19f2c86e9 100644
--- a/crates/ide_completion/src/render/function.rs
+++ b/crates/ide_completion/src/render/function.rs
@@ -191,7 +191,7 @@ impl<'a> FunctionRender<'a> {
 #[cfg(test)]
 mod tests {
     use crate::{
-        test_utils::{check_edit, check_edit_with_config, TEST_CONFIG},
+        tests::{check_edit, check_edit_with_config, TEST_CONFIG},
         CompletionConfig,
     };
 
diff --git a/crates/ide_completion/src/render/macro_.rs b/crates/ide_completion/src/render/macro_.rs
index 3a7238bb8..d5a1f45d3 100644
--- a/crates/ide_completion/src/render/macro_.rs
+++ b/crates/ide_completion/src/render/macro_.rs
@@ -133,7 +133,7 @@ fn guess_macro_braces(macro_name: &str, docs: &str) -> (&'static str, &'static s
 
 #[cfg(test)]
 mod tests {
-    use crate::test_utils::check_edit;
+    use crate::tests::check_edit;
 
     #[test]
     fn dont_insert_macro_call_parens_unncessary() {
diff --git a/crates/ide_completion/src/test_utils.rs b/crates/ide_completion/src/test_utils.rs
deleted file mode 100644
index b0a4b2026..000000000
--- a/crates/ide_completion/src/test_utils.rs
+++ /dev/null
@@ -1,154 +0,0 @@
-//! Runs completion for testing purposes.
-
-use hir::{PrefixKind, Semantics};
-use ide_db::{
-    base_db::{fixture::ChangeFixture, FileLoader, FilePosition},
-    helpers::{
-        insert_use::{ImportGranularity, InsertUseConfig},
-        SnippetCap,
-    },
-    RootDatabase,
-};
-use itertools::Itertools;
-use stdx::{format_to, trim_indent};
-use syntax::{AstNode, NodeOrToken, SyntaxElement};
-use test_utils::assert_eq_text;
-
-use crate::{item::CompletionKind, CompletionConfig, CompletionItem};
-
-pub(crate) const TEST_CONFIG: CompletionConfig = CompletionConfig {
-    enable_postfix_completions: true,
-    enable_imports_on_the_fly: true,
-    enable_self_on_the_fly: true,
-    add_call_parenthesis: true,
-    add_call_argument_snippets: true,
-    snippet_cap: SnippetCap::new(true),
-    insert_use: InsertUseConfig {
-        granularity: ImportGranularity::Crate,
-        prefix_kind: PrefixKind::Plain,
-        enforce_granularity: true,
-        group: true,
-    },
-};
-
-/// Creates analysis from a multi-file fixture, returns positions marked with $0.
-pub(crate) fn position(ra_fixture: &str) -> (RootDatabase, FilePosition) {
-    let change_fixture = ChangeFixture::parse(ra_fixture);
-    let mut database = RootDatabase::default();
-    database.apply_change(change_fixture.change);
-    let (file_id, range_or_offset) = change_fixture.file_position.expect("expected a marker ($0)");
-    let offset = range_or_offset.expect_offset();
-    (database, FilePosition { file_id, offset })
-}
-
-pub(crate) fn do_completion(code: &str, kind: CompletionKind) -> Vec<CompletionItem> {
-    do_completion_with_config(TEST_CONFIG, code, kind)
-}
-
-pub(crate) fn do_completion_with_config(
-    config: CompletionConfig,
-    code: &str,
-    kind: CompletionKind,
-) -> Vec<CompletionItem> {
-    get_all_items(config, code)
-        .into_iter()
-        .filter(|c| c.completion_kind == kind)
-        .sorted_by(|l, r| l.label().cmp(r.label()))
-        .collect()
-}
-
-pub(crate) fn completion_list(code: &str, kind: CompletionKind) -> String {
-    completion_list_with_config(TEST_CONFIG, code, kind)
-}
-
-pub(crate) fn completion_list_with_config(
-    config: CompletionConfig,
-    code: &str,
-    kind: CompletionKind,
-) -> String {
-    let kind_completions: Vec<CompletionItem> =
-        get_all_items(config, code).into_iter().filter(|c| c.completion_kind == kind).collect();
-    let label_width = kind_completions
-        .iter()
-        .map(|it| monospace_width(it.label()))
-        .max()
-        .unwrap_or_default()
-        .min(16);
-    kind_completions
-        .into_iter()
-        .map(|it| {
-            let tag = it.kind().unwrap().tag();
-            let var_name = format!("{} {}", tag, it.label());
-            let mut buf = var_name;
-            if let Some(detail) = it.detail() {
-                let width = label_width.saturating_sub(monospace_width(it.label()));
-                format_to!(buf, "{:width$} {}", "", detail, width = width);
-            }
-            if it.deprecated() {
-                format_to!(buf, " DEPRECATED");
-            }
-            format_to!(buf, "\n");
-            buf
-        })
-        .collect()
-}
-
-fn monospace_width(s: &str) -> usize {
-    s.chars().count()
-}
-
-pub(crate) fn check_edit(what: &str, ra_fixture_before: &str, ra_fixture_after: &str) {
-    check_edit_with_config(TEST_CONFIG, what, ra_fixture_before, ra_fixture_after)
-}
-
-pub(crate) fn check_edit_with_config(
-    config: CompletionConfig,
-    what: &str,
-    ra_fixture_before: &str,
-    ra_fixture_after: &str,
-) {
-    let ra_fixture_after = trim_indent(ra_fixture_after);
-    let (db, position) = position(ra_fixture_before);
-    let completions: Vec<CompletionItem> =
-        crate::completions(&db, &config, position).unwrap().into();
-    let (completion,) = completions
-        .iter()
-        .filter(|it| it.lookup() == what)
-        .collect_tuple()
-        .unwrap_or_else(|| panic!("can't find {:?} completion in {:#?}", what, completions));
-    let mut actual = db.file_text(position.file_id).to_string();
-
-    let mut combined_edit = completion.text_edit().to_owned();
-    if let Some(import_text_edit) =
-        completion.import_to_add().and_then(|edit| edit.to_text_edit(config.insert_use))
-    {
-        combined_edit.union(import_text_edit).expect(
-            "Failed to apply completion resolve changes: change ranges overlap, but should not",
-        )
-    }
-
-    combined_edit.apply(&mut actual);
-    assert_eq_text!(&ra_fixture_after, &actual)
-}
-
-pub(crate) fn check_pattern_is_applicable(code: &str, check: impl FnOnce(SyntaxElement) -> bool) {
-    let (db, pos) = position(code);
-
-    let sema = Semantics::new(&db);
-    let original_file = sema.parse(pos.file_id);
-    let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
-    assert!(check(NodeOrToken::Token(token)));
-}
-
-pub(crate) fn check_pattern_is_not_applicable(code: &str, check: fn(SyntaxElement) -> bool) {
-    let (db, pos) = position(code);
-    let sema = Semantics::new(&db);
-    let original_file = sema.parse(pos.file_id);
-    let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
-    assert!(!check(NodeOrToken::Token(token)));
-}
-
-pub(crate) fn get_all_items(config: CompletionConfig, code: &str) -> Vec<CompletionItem> {
-    let (db, position) = position(code);
-    crate::completions(&db, &config, position).unwrap().into()
-}
diff --git a/crates/ide_completion/src/tests.rs b/crates/ide_completion/src/tests.rs
index 2205603fa..1495924ea 100644
--- a/crates/ide_completion/src/tests.rs
+++ b/crates/ide_completion/src/tests.rs
@@ -1,11 +1,34 @@
 mod item_list;
 
-use expect_test::Expect;
-use stdx::format_to;
+use hir::{PrefixKind, Semantics};
+use ide_db::{
+    base_db::{fixture::ChangeFixture, FileLoader, FilePosition},
+    helpers::{
+        insert_use::{ImportGranularity, InsertUseConfig},
+        SnippetCap,
+    },
+    RootDatabase,
+};
+use itertools::Itertools;
+use stdx::{format_to, trim_indent};
+use syntax::{AstNode, NodeOrToken, SyntaxElement};
+use test_utils::assert_eq_text;
+
+use crate::{item::CompletionKind, CompletionConfig, CompletionItem};
 
-use crate::{
-    test_utils::{self, get_all_items, TEST_CONFIG},
-    CompletionConfig, CompletionItem,
+pub(crate) const TEST_CONFIG: CompletionConfig = CompletionConfig {
+    enable_postfix_completions: true,
+    enable_imports_on_the_fly: true,
+    enable_self_on_the_fly: true,
+    add_call_parenthesis: true,
+    add_call_argument_snippets: true,
+    snippet_cap: SnippetCap::new(true),
+    insert_use: InsertUseConfig {
+        granularity: ImportGranularity::Crate,
+        prefix_kind: PrefixKind::Plain,
+        enforce_granularity: true,
+        group: true,
+    },
 };
 
 fn completion_list(code: &str) -> String {
@@ -13,18 +36,56 @@ fn completion_list(code: &str) -> String {
 }
 
 fn completion_list_with_config(config: CompletionConfig, code: &str) -> String {
+    render_completion_list(get_all_items(config, code))
+}
+
+/// Creates analysis from a multi-file fixture, returns positions marked with $0.
+pub(crate) fn position(ra_fixture: &str) -> (RootDatabase, FilePosition) {
+    let change_fixture = ChangeFixture::parse(ra_fixture);
+    let mut database = RootDatabase::default();
+    database.apply_change(change_fixture.change);
+    let (file_id, range_or_offset) = change_fixture.file_position.expect("expected a marker ($0)");
+    let offset = range_or_offset.expect_offset();
+    (database, FilePosition { file_id, offset })
+}
+
+pub(crate) fn do_completion(code: &str, kind: CompletionKind) -> Vec<CompletionItem> {
+    do_completion_with_config(TEST_CONFIG, code, kind)
+}
+
+pub(crate) fn do_completion_with_config(
+    config: CompletionConfig,
+    code: &str,
+    kind: CompletionKind,
+) -> Vec<CompletionItem> {
+    get_all_items(config, code)
+        .into_iter()
+        .filter(|c| c.completion_kind == kind)
+        .sorted_by(|l, r| l.label().cmp(r.label()))
+        .collect()
+}
+
+pub(crate) fn filtered_completion_list(code: &str, kind: CompletionKind) -> String {
+    filtered_completion_list_with_config(TEST_CONFIG, code, kind)
+}
+
+pub(crate) fn filtered_completion_list_with_config(
+    config: CompletionConfig,
+    code: &str,
+    kind: CompletionKind,
+) -> String {
+    let kind_completions: Vec<CompletionItem> =
+        get_all_items(config, code).into_iter().filter(|c| c.completion_kind == kind).collect();
+    render_completion_list(kind_completions)
+}
+
+fn render_completion_list(completions: Vec<CompletionItem>) -> String {
     fn monospace_width(s: &str) -> usize {
         s.chars().count()
     }
-
-    let kind_completions: Vec<CompletionItem> = get_all_items(config, code).into_iter().collect();
-    let label_width = kind_completions
-        .iter()
-        .map(|it| monospace_width(it.label()))
-        .max()
-        .unwrap_or_default()
-        .min(16);
-    kind_completions
+    let label_width =
+        completions.iter().map(|it| monospace_width(it.label())).max().unwrap_or_default().min(16);
+    completions
         .into_iter()
         .map(|it| {
             let tag = it.kind().unwrap().tag();
@@ -43,23 +104,64 @@ fn completion_list_with_config(config: CompletionConfig, code: &str) -> String {
         .collect()
 }
 
-fn check(ra_fixture: &str, expect: Expect) {
-    let base = r#"#[rustc_builtin_macro]
-pub macro Clone {}
-enum Enum { Variant }
-struct Struct {}
-#[macro_export]
-macro_rules! foo {}
-mod bar {}
-const CONST: () = ();
-trait Trait {}
-"#;
-    let actual = completion_list(&format!("{}{}", base, ra_fixture));
-    expect.assert_eq(&actual)
+pub(crate) fn check_edit(what: &str, ra_fixture_before: &str, ra_fixture_after: &str) {
+    check_edit_with_config(TEST_CONFIG, what, ra_fixture_before, ra_fixture_after)
+}
+
+pub(crate) fn check_edit_with_config(
+    config: CompletionConfig,
+    what: &str,
+    ra_fixture_before: &str,
+    ra_fixture_after: &str,
+) {
+    let ra_fixture_after = trim_indent(ra_fixture_after);
+    let (db, position) = position(ra_fixture_before);
+    let completions: Vec<CompletionItem> =
+        crate::completions(&db, &config, position).unwrap().into();
+    let (completion,) = completions
+        .iter()
+        .filter(|it| it.lookup() == what)
+        .collect_tuple()
+        .unwrap_or_else(|| panic!("can't find {:?} completion in {:#?}", what, completions));
+    let mut actual = db.file_text(position.file_id).to_string();
+
+    let mut combined_edit = completion.text_edit().to_owned();
+    if let Some(import_text_edit) =
+        completion.import_to_add().and_then(|edit| edit.to_text_edit(config.insert_use))
+    {
+        combined_edit.union(import_text_edit).expect(
+            "Failed to apply completion resolve changes: change ranges overlap, but should not",
+        )
+    }
+
+    combined_edit.apply(&mut actual);
+    assert_eq_text!(&ra_fixture_after, &actual)
+}
+
+pub(crate) fn check_pattern_is_applicable(code: &str, check: impl FnOnce(SyntaxElement) -> bool) {
+    let (db, pos) = position(code);
+
+    let sema = Semantics::new(&db);
+    let original_file = sema.parse(pos.file_id);
+    let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
+    assert!(check(NodeOrToken::Token(token)));
+}
+
+pub(crate) fn check_pattern_is_not_applicable(code: &str, check: fn(SyntaxElement) -> bool) {
+    let (db, pos) = position(code);
+    let sema = Semantics::new(&db);
+    let original_file = sema.parse(pos.file_id);
+    let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
+    assert!(!check(NodeOrToken::Token(token)));
+}
+
+pub(crate) fn get_all_items(config: CompletionConfig, code: &str) -> Vec<CompletionItem> {
+    let (db, position) = position(code);
+    crate::completions(&db, &config, position).unwrap().into()
 }
 
 fn check_no_completion(ra_fixture: &str) {
-    let (db, position) = test_utils::position(ra_fixture);
+    let (db, position) = position(ra_fixture);
 
     assert!(
         crate::completions(&db, &TEST_CONFIG, position).is_none(),
diff --git a/crates/ide_completion/src/tests/item_list.rs b/crates/ide_completion/src/tests/item_list.rs
index 33b23b8b4..7c124ac37 100644
--- a/crates/ide_completion/src/tests/item_list.rs
+++ b/crates/ide_completion/src/tests/item_list.rs
@@ -1,14 +1,26 @@
-use expect_test::expect;
+use expect_test::{expect, Expect};
 
-use crate::tests::check;
+use crate::tests::completion_list;
+
+fn check(ra_fixture: &str, expect: Expect) {
+    let base = r#"#[rustc_builtin_macro]
+pub macro Clone {}
+enum Enum { Variant }
+struct Struct {}
+#[macro_export]
+macro_rules! foo {}
+mod bar {}
+const CONST: () = ();
+trait Trait {}
+"#;
+    let actual = completion_list(&format!("{}{}", base, ra_fixture));
+    expect.assert_eq(&actual)
+}
 
 #[test]
 fn in_mod_item_list() {
     check(
-        r#"mod tests {
-    $0
-}
-"#,
+        r#"mod tests { $0 }"#,
         expect![[r##"
             kw pub(crate)
             kw pub
@@ -164,9 +176,7 @@ fn after_visibility_unsafe() {
 #[test]
 fn in_impl_assoc_item_list() {
     check(
-        r#"impl Struct {
-    $0
-}"#,
+        r#"impl Struct { $0 }"#,
         expect![[r##"
             kw pub(crate)
             kw pub
@@ -184,9 +194,7 @@ fn in_impl_assoc_item_list() {
 #[test]
 fn in_impl_assoc_item_list_after_attr() {
     check(
-        r#"impl Struct {
-    #[attr] $0
-}"#,
+        r#"impl Struct { #[attr] $0 }"#,
         expect![[r#"
             kw pub(crate)
             kw pub