try a basic runtest

cargo-dist/Cargo.toml

@@ -67,6 +67,7 @@ tokio = { version = "1.36.0", features = ["full"] }
 temp-dir = "0.1.13"
 
 [dev-dependencies]
+homedir = "0.2.1"
 insta = { version = "1.38.0", features = ["filters"] }
 tar = "0.4.38"
 flate2 = "1.0.24"

cargo-dist/tests/cli-tests.rs

@@ -1,9 +1,12 @@
 use std::process::{Command, Output, Stdio};
 
 static BIN: &str = env!("CARGO_BIN_EXE_cargo-dist");
+const ENV_RUIN_ME: &str = "RUIN_MY_COMPUTER_WITH_INSTALLERS";
 
 #[allow(dead_code)]
 mod gallery;
+use axoasset::LocalAsset;
+use camino::Utf8PathBuf;
 use gallery::*;
 
 fn format_outputs(output: &Output) -> String {
@@ -191,3 +194,62 @@ fn test_markdown_help() {
     });
     assert!(output.status.success(), "{}", output.status);
 }
+
+static RECEIPT_TEMPLATE: &str = r#"{"binaries":["cargo-dist"],"install_prefix":"INSTALL_PREFIX","provider":{"source":"cargo-dist","version":"0.10.0-prerelease.1"},"source":{"app_name":"cargo-dist","name":"cargo-dist","owner":"axodotdev","release_type":"github"},"version":"VERSION"}"#;
+
+fn install_receipt(version: &str, prefix: &Utf8PathBuf) -> String {
+    RECEIPT_TEMPLATE
+        .replace("INSTALL_PREFIX", &prefix.to_string().replace('\\', "\\\\"))
+        .replace("VERSION", version)
+}
+
+fn write_receipt(version: &str, prefix: &Utf8PathBuf, config_path: &Utf8PathBuf) {
+    let contents = install_receipt(version, prefix);
+    let receipt_name = config_path.join("cargo-dist-receipt.json");
+    LocalAsset::write_new(&contents, receipt_name).unwrap();
+}
+
+#[test]
+fn test_self_update() {
+    // Only do this if RUIN_MY_COMPUTER_WITH_INSTALLERS is set
+    // Also keep it to Mac/Linux until I remember how Windows paths work
+    #[cfg(target_family = "unix")]
+    if std::env::var(ENV_RUIN_ME)
+        .map(|s| !s.is_empty())
+        .unwrap_or(false)
+    {
+        let dist_home = Utf8PathBuf::from_path_buf(
+            homedir::get_my_home()
+                .unwrap()
+                .unwrap()
+                .join(".cargo")
+                .join("bin"),
+        )
+        .unwrap();
+        let dist_path = &dist_home.join("cargo-dist");
+        let config_path = Utf8PathBuf::from_path_buf(
+            homedir::get_my_home()
+                .unwrap()
+                .unwrap()
+                .join(".config")
+                .join("cargo-dist"),
+        )
+        .unwrap();
+
+        // Install to the home directory
+        std::fs::copy(BIN, dist_path).unwrap();
+
+        // Create a fake install receipt
+        write_receipt("0.13.0", &dist_home, &config_path);
+
+        let output = Command::new(dist_path)
+            .arg("dist")
+            .arg("update")
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped())
+            .output()
+            .unwrap();
+
+        assert!(output.status.success());
+    }
+}