diff --git a/tests/testsuite/main.rs b/tests/testsuite/main.rs
index e2ff2d9a95d7..07f749e34386 100644
--- a/tests/testsuite/main.rs
+++ b/tests/testsuite/main.rs
@@ -132,7 +132,6 @@ mod patch;
 mod path;
 mod paths;
 mod pkgid;
-mod plugins;
 mod proc_macro;
 mod profile_config;
 mod profile_custom;
diff --git a/tests/testsuite/plugins.rs b/tests/testsuite/plugins.rs
deleted file mode 100644
index 331ba32e00dd..000000000000
--- a/tests/testsuite/plugins.rs
+++ /dev/null
@@ -1,421 +0,0 @@
-//! Tests for rustc plugins.
-
-use cargo_test_support::rustc_host;
-use cargo_test_support::{basic_manifest, project};
-
-#[cargo_test(nightly, reason = "plugins are unstable")]
-fn plugin_to_the_max() {
-    let foo = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                name = "foo_lib"
-
-                [dependencies.bar]
-                path = "../bar"
-            "#,
-        )
-        .file(
-            "src/main.rs",
-            r#"
-                #![feature(plugin)]
-                #![plugin(bar)]
-                extern crate foo_lib;
-
-                fn main() { foo_lib::foo(); }
-            "#,
-        )
-        .file(
-            "src/foo_lib.rs",
-            r#"
-                #![feature(plugin)]
-                #![plugin(bar)]
-
-                pub fn foo() {}
-            "#,
-        )
-        .build();
-    let _bar = project()
-        .at("bar")
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                name = "bar"
-                plugin = true
-
-                [dependencies.baz]
-                path = "../baz"
-            "#,
-        )
-        .file(
-            "src/lib.rs",
-            r#"
-                #![feature(rustc_private)]
-
-                extern crate baz;
-                extern crate rustc_driver;
-
-                use rustc_driver::plugin::Registry;
-
-                #[no_mangle]
-                pub fn __rustc_plugin_registrar(_reg: &mut Registry) {
-                    println!("{}", baz::baz());
-                }
-            "#,
-        )
-        .build();
-    let _baz = project()
-        .at("baz")
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "baz"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                name = "baz"
-                crate_type = ["dylib"]
-            "#,
-        )
-        .file("src/lib.rs", "pub fn baz() -> i32 { 1 }")
-        .build();
-
-    foo.cargo("build").run();
-    foo.cargo("doc").run();
-}
-
-#[cargo_test(nightly, reason = "plugins are unstable")]
-fn plugin_with_dynamic_native_dependency() {
-    let build = project()
-        .at("builder")
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "builder"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                name = "builder"
-                crate-type = ["dylib"]
-            "#,
-        )
-        .file("src/lib.rs", "#[no_mangle] pub extern fn foo() {}")
-        .build();
-
-    let foo = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [dependencies.bar]
-                path = "bar"
-            "#,
-        )
-        .file(
-            "src/main.rs",
-            r#"
-                #![feature(plugin)]
-                #![plugin(bar)]
-
-                fn main() {}
-            "#,
-        )
-        .file(
-            "bar/Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-                build = 'build.rs'
-
-                [lib]
-                name = "bar"
-                plugin = true
-            "#,
-        )
-        .file(
-            "bar/build.rs",
-            r#"
-                use std::env;
-                use std::fs;
-                use std::path::PathBuf;
-
-                fn main() {
-                    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
-                    let root = PathBuf::from(env::var("BUILDER_ROOT").unwrap());
-                    let file = format!("{}builder{}",
-                        env::consts::DLL_PREFIX,
-                        env::consts::DLL_SUFFIX);
-                    let src = root.join(&file);
-                    let dst = out_dir.join(&file);
-                    fs::copy(src, dst).unwrap();
-                    if cfg!(target_env = "msvc") {
-                        fs::copy(root.join("builder.dll.lib"),
-                                 out_dir.join("builder.dll.lib")).unwrap();
-                    }
-                    println!("cargo:rustc-flags=-L {}", out_dir.display());
-                }
-            "#,
-        )
-        .file(
-            "bar/src/lib.rs",
-            r#"
-                #![feature(rustc_private)]
-
-                extern crate rustc_driver;
-                use rustc_driver::plugin::Registry;
-
-                #[cfg_attr(not(target_env = "msvc"), link(name = "builder"))]
-                #[cfg_attr(target_env = "msvc", link(name = "builder.dll"))]
-                extern { fn foo(); }
-
-                #[no_mangle]
-                pub fn __rustc_plugin_registrar(_reg: &mut Registry) {
-                    unsafe { foo() }
-                }
-            "#,
-        )
-        .build();
-
-    build.cargo("build").run();
-
-    let root = build.root().join("target").join("debug");
-    foo.cargo("build -v").env("BUILDER_ROOT", root).run();
-}
-
-#[cargo_test]
-fn plugin_integration() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-                build = "build.rs"
-
-                [lib]
-                name = "foo"
-                plugin = true
-                doctest = false
-            "#,
-        )
-        .file("build.rs", "fn main() {}")
-        .file("src/lib.rs", "")
-        .file("tests/it_works.rs", "")
-        .build();
-
-    p.cargo("test -v").run();
-}
-
-#[cargo_test]
-fn doctest_a_plugin() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [dependencies]
-                bar = { path = "bar" }
-            "#,
-        )
-        .file("src/lib.rs", "#[macro_use] extern crate bar;")
-        .file(
-            "bar/Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                name = "bar"
-                plugin = true
-            "#,
-        )
-        .file("bar/src/lib.rs", "pub fn bar() {}")
-        .build();
-
-    p.cargo("test -v").run();
-}
-
-// See #1515
-#[cargo_test]
-fn native_plugin_dependency_with_custom_linker() {
-    let target = rustc_host();
-
-    let _foo = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                plugin = true
-            "#,
-        )
-        .file("src/lib.rs", "")
-        .build();
-
-    let bar = project()
-        .at("bar")
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-
-                [dependencies.foo]
-                path = "../foo"
-            "#,
-        )
-        .file("src/lib.rs", "")
-        .file(
-            ".cargo/config",
-            &format!(
-                r#"
-                    [target.{}]
-                    linker = "nonexistent-linker"
-                "#,
-                target
-            ),
-        )
-        .build();
-
-    bar.cargo("build --verbose")
-        .with_status(101)
-        .with_stderr_contains(
-            "\
-[COMPILING] foo v0.0.1 ([..])
-[RUNNING] `rustc [..] -C linker=nonexistent-linker [..]`
-[ERROR] [..]linker[..]
-",
-        )
-        .run();
-}
-
-#[cargo_test(nightly, reason = "requires rustc_private")]
-fn panic_abort_plugins() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [profile.dev]
-                panic = 'abort'
-
-                [dependencies]
-                bar = { path = "bar" }
-            "#,
-        )
-        .file("src/lib.rs", "")
-        .file(
-            "bar/Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                plugin = true
-            "#,
-        )
-        .file(
-            "bar/src/lib.rs",
-            r#"
-                #![feature(rustc_private)]
-                extern crate rustc_ast;
-                extern crate rustc_driver;
-            "#,
-        )
-        .build();
-
-    p.cargo("build").run();
-}
-
-#[cargo_test(nightly, reason = "requires rustc_private")]
-fn shared_panic_abort_plugins() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            r#"
-                [package]
-                name = "foo"
-                version = "0.0.1"
-                authors = []
-
-                [profile.dev]
-                panic = 'abort'
-
-                [dependencies]
-                bar = { path = "bar" }
-                baz = { path = "baz" }
-            "#,
-        )
-        .file("src/lib.rs", "extern crate baz;")
-        .file(
-            "bar/Cargo.toml",
-            r#"
-                [package]
-                name = "bar"
-                version = "0.0.1"
-                authors = []
-
-                [lib]
-                plugin = true
-
-                [dependencies]
-                baz = { path = "../baz" }
-            "#,
-        )
-        .file(
-            "bar/src/lib.rs",
-            r#"
-                #![feature(rustc_private)]
-                extern crate rustc_ast;
-                extern crate rustc_driver;
-                extern crate baz;
-            "#,
-        )
-        .file("baz/Cargo.toml", &basic_manifest("baz", "0.0.1"))
-        .file("baz/src/lib.rs", "")
-        .build();
-
-    p.cargo("build -v").run();
-}