1 files changed, 89 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/versioncheck.rs b/src/tools/clippy/tests/versioncheck.rs
new file mode 100644
index 000000000..38498ebdc
--- /dev/null
+++ b/src/tools/clippy/tests/versioncheck.rs
@@ -0,0 +1,89 @@
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+#![allow(clippy::single_match_else)]
+
+use rustc_tools_util::VersionInfo;
+use std::fs;
+
+#[test]
+fn check_that_clippy_lints_and_clippy_utils_have_the_same_version_as_clippy() {
+    fn read_version(path: &str) -> String {
+        let contents = fs::read_to_string(path).unwrap_or_else(|e| panic!("error reading `{}`: {:?}", path, e));
+        contents
+            .lines()
+            .filter_map(|l| l.split_once('='))
+            .find_map(|(k, v)| (k.trim() == "version").then(|| v.trim()))
+            .unwrap_or_else(|| panic!("error finding version in `{}`", path))
+            .to_string()
+    }
+
+    // do not run this test inside the upstream rustc repo:
+    // https://github.com/rust-lang/rust-clippy/issues/6683
+    if option_env!("RUSTC_TEST_SUITE").is_some() {
+        return;
+    }
+
+    let clippy_version = read_version("Cargo.toml");
+    let clippy_lints_version = read_version("clippy_lints/Cargo.toml");
+    let clippy_utils_version = read_version("clippy_utils/Cargo.toml");
+
+    assert_eq!(clippy_version, clippy_lints_version);
+    assert_eq!(clippy_version, clippy_utils_version);
+}
+
+#[test]
+fn check_that_clippy_has_the_same_major_version_as_rustc() {
+    // do not run this test inside the upstream rustc repo:
+    // https://github.com/rust-lang/rust-clippy/issues/6683
+    if option_env!("RUSTC_TEST_SUITE").is_some() {
+        return;
+    }
+
+    let clippy_version = rustc_tools_util::get_version_info!();
+    let clippy_major = clippy_version.major;
+    let clippy_minor = clippy_version.minor;
+    let clippy_patch = clippy_version.patch;
+
+    // get the rustc version either from the rustc installed with the toolchain file or from
+    // `RUSTC_REAL` if Clippy is build in the Rust repo with `./x.py`.
+    let rustc = std::env::var("RUSTC_REAL").unwrap_or_else(|_| "rustc".to_string());
+    let rustc_version = String::from_utf8(
+        std::process::Command::new(&rustc)
+            .arg("--version")
+            .output()
+            .expect("failed to run `rustc --version`")
+            .stdout,
+    )
+    .unwrap();
+    // extract "1 XX 0" from "rustc 1.XX.0-nightly (<commit> <date>)"
+    let vsplit: Vec<&str> = rustc_version
+        .split(' ')
+        .nth(1)
+        .unwrap()
+        .split('-')
+        .next()
+        .unwrap()
+        .split('.')
+        .collect();
+    match vsplit.as_slice() {
+        [rustc_major, rustc_minor, _rustc_patch] => {
+            // clippy 0.1.XX should correspond to rustc 1.XX.0
+            assert_eq!(clippy_major, 0); // this will probably stay the same for a long time
+            assert_eq!(
+                clippy_minor.to_string(),
+                *rustc_major,
+                "clippy minor version does not equal rustc major version"
+            );
+            assert_eq!(
+                clippy_patch.to_string(),
+                *rustc_minor,
+                "clippy patch version does not equal rustc minor version"
+            );
+            // do not check rustc_patch because when a stable-patch-release is made (like 1.50.2),
+            // we don't want our tests failing suddenly
+        },
+        _ => {
+            panic!("Failed to parse rustc version: {:?}", vsplit);
+        },
+    };
+}