add a test for not rebuilding up-to-date targets

1 files changed, 48 insertions, 0 deletions

diff --git a/tests/update_logic.rs b/tests/update_logic.rs
new file mode 100644
index 0000000..2b74606
--- /dev/null
+++ b/tests/update_logic.rs
@@ -0,0 +1,48 @@
+use std::fs;
+use std::path::Path;
+use std::process::{Command, Output};
+
+use eyre::{Result, WrapErr};
+
+type R = Result<()>;
+
+fn make(dir: impl AsRef<Path>) -> Result<Output> {
+    Command::new(env!("CARGO_BIN_EXE_makers"))
+        .current_dir(dir)
+        .output()
+        .wrap_err("")
+}
+
+#[test]
+fn basic_test() -> R {
+    let dir = tempfile::tempdir()?;
+    let file = "
+based-on-what: based-on-this
+\techo hi
+    ";
+    fs::write(dir.path().join("Makefile"), file)?;
+    let result = make(&dir)?;
+    assert!(!result.status.success());
+    assert!(String::from_utf8(result.stderr)?.contains("based-on-this"));
+
+    fs::write(dir.path().join("based-on-this"), "")?;
+    let result = make(&dir)?;
+    assert!(result.status.success());
+    assert!(String::from_utf8(result.stdout)?.contains("echo hi"));
+
+    let result = make(&dir)?;
+    assert!(result.status.success());
+    assert!(String::from_utf8(result.stdout)?.contains("echo hi"));
+
+    fs::write(dir.path().join("based-on-what"), "")?;
+    let result = make(&dir)?;
+    assert!(result.status.success());
+    assert!(!String::from_utf8(result.stdout)?.contains("echo hi"));
+
+    fs::write(dir.path().join("based-on-this"), "")?;
+    let result = make(&dir)?;
+    assert!(result.status.success());
+    assert!(String::from_utf8(result.stdout)?.contains("echo hi"));
+
+    Ok(())
+}