Rework some test projects to use the "foo" default

Generally that means either switching "foo" and "bar" around (reversing
the arrow), or it means push "foo" to "bar" (and sometimes "bar" to
"baz", etc..) to free up "foo".

For trivia that leaves 80/1222 outliers, therefore 93.4% of test
project use the default. :)

tests/testsuite/bad_config.rs

@@ -325,39 +325,39 @@ Caused by:
 
 #[test]
 fn duplicate_packages_in_cargo_lock() {
-    Package::new("foo", "0.1.0").publish();
+    Package::new("bar", "0.1.0").publish();
 
-    let p = project().at("bar")
+    let p = project()
         .file(
             "Cargo.toml",
             r#"
             [project]
-            name = "bar"
+            name = "foo"
             version = "0.0.1"
             authors = []
 
             [dependencies]
-            foo = "0.1.0"
+            bar = "0.1.0"
         "#,
         )
         .file("src/lib.rs", "")
         .file(
             "Cargo.lock",
             r#"
             [[package]]
-            name = "bar"
+            name = "foo"
             version = "0.0.1"
             dependencies = [
-             "foo 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+             "bar 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
             ]
 
             [[package]]
-            name = "foo"
+            name = "bar"
             version = "0.1.0"
             source = "registry+https://github.com/rust-lang/crates.io-index"
 
             [[package]]
-            name = "foo"
+            name = "bar"
             version = "0.1.0"
             source = "registry+https://github.com/rust-lang/crates.io-index"
         "#,
@@ -371,42 +371,42 @@ fn duplicate_packages_in_cargo_lock() {
 [ERROR] failed to parse lock file at: [..]
 
 Caused by:
-  package `foo` is specified twice in the lockfile
+  package `bar` is specified twice in the lockfile
 ",
         ),
     );
 }
 
 #[test]
 fn bad_source_in_cargo_lock() {
-    Package::new("foo", "0.1.0").publish();
+    Package::new("bar", "0.1.0").publish();
 
-    let p = project().at("bar")
+    let p = project()
         .file(
             "Cargo.toml",
             r#"
             [project]
-            name = "bar"
+            name = "foo"
             version = "0.0.1"
             authors = []
 
             [dependencies]
-            foo = "0.1.0"
+            bar = "0.1.0"
         "#,
         )
         .file("src/lib.rs", "")
         .file(
             "Cargo.lock",
             r#"
             [[package]]
-            name = "bar"
+            name = "foo"
             version = "0.0.1"
             dependencies = [
-             "foo 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+             "bar 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
             ]
 
             [[package]]
-            name = "foo"
+            name = "bar"
             version = "0.1.0"
             source = "You shall not parse"
         "#,
@@ -933,29 +933,29 @@ warning: unused manifest key: workspace.bulid
 
 #[test]
 fn empty_dependencies() {
-    let p = project().at("empty_deps")
+    let p = project()
         .file(
             "Cargo.toml",
             r#"
             [package]
-            name = "empty_deps"
+            name = "foo"
             version = "0.0.0"
             authors = []
 
             [dependencies]
-            foo = {}
+            bar = {}
         "#,
         )
         .file("src/main.rs", "fn main() {}")
         .build();
 
-    Package::new("foo", "0.0.1").publish();
+    Package::new("bar", "0.0.1").publish();
 
     assert_that(
         p.cargo("build"),
         execs().with_status(0).with_stderr_contains(
             "\
-warning: dependency (foo) specified without providing a local path, Git repository, or version \
+warning: dependency (bar) specified without providing a local path, Git repository, or version \
 to use. This will be considered an error in future versions
 ",
         ),
@@ -964,20 +964,20 @@ to use. This will be considered an error in future versions
 
 #[test]
 fn invalid_toml_historically_allowed_is_warned() {
-    let p = project().at("empty_deps")
+    let p = project()
         .file(
             "Cargo.toml",
             r#"
             [package]
-            name = "empty_deps"
+            name = "foo"
             version = "0.0.0"
             authors = []
         "#,
         )
         .file(
             ".cargo/config",
             r#"
-            [foo] bar = 2
+            [bar] baz = 2
         "#,
         )
         .file("src/main.rs", "fn main() {}")
@@ -994,7 +994,7 @@ The TOML spec requires newlines after table definitions (e.g. `[a] b = 1` is
 invalid), but this file has a table header which does not have a newline after
 it. A newline needs to be added and this warning will soon become a hard error
 in the future.
-[COMPILING] empty_deps v0.0.0 ([..])
+[COMPILING] foo v0.0.0 ([..])
 [FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
 ",
         ),