test(cli): integration tests

Cargo.toml

@@ -8,3 +8,7 @@ edition = "2021"
 [dependencies]
 clap = { version = "4.4.2", features = ["derive"] }
 sophia = { version = "0.8.0-alpha.3", features = ["xml"] }
+
+[dev-dependencies]
+assert_cmd = "2.0.12"
+tempfile = "3.8.1"

src/cli.rs

@@ -6,7 +6,7 @@ use std::str::FromStr;
 
 // This lets clap automate validation of
 // RDF formats from the command line
-#[derive(Clone, Debug, ValueEnum)]
+#[derive(Clone, Debug, PartialEq, ValueEnum)]
 pub enum GraphFormat {
     #[clap(alias = "ttl")]
     Turtle,

src/main.rs

@@ -76,3 +76,46 @@ fn main() -> Result<(), Box<dyn Error>> {
     RdfSerializer::serialize(output, output_format, parser.graph)?;
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use assert_cmd::Command;
+    use std::fs::File;
+    use std::io::Write;
+    use tempfile::tempdir;
+
+    #[test]
+    fn test_format_from_path() {
+        assert_eq!(format_from_path("file.ttl"), Some(GraphFormat::Turtle));
+        assert_eq!(format_from_path("file.nt"), Some(GraphFormat::NTriples));
+        assert_eq!(format_from_path("file.rdf"), Some(GraphFormat::RdfXml));
+        assert_eq!(format_from_path("file.unknown"), None);
+        assert_eq!(format_from_path("file"), None);
+    }
+
+    #[test]
+    fn test_main() -> Result<(), Box<dyn Error>> {
+        let dir = tempdir()?;
+        let input_file = dir.path().join("input.ttl");
+
+        let mut input = File::create(&input_file)?;
+        writeln!(
+            input,
+            "<http://example.org> <http://example.org/predicate> \"object\" ."
+        )?;
+
+        let mut cmd = Command::cargo_bin("rdfpipe-rs").unwrap();
+        let status = cmd
+            .arg("-i")
+            .arg("turtle")
+            .arg("-o")
+            .arg("rdf-xml")
+            .arg(&input_file)
+            .assert();
+
+        status.success();
+
+        Ok(())
+    }
+}