Update File Symbol, add tests

tests/file.rs

@@ -0,0 +1,103 @@
+extern crate schematics;
+extern crate tempdir;
+
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use tempdir::TempDir;
+use schematics::symbols::Symbol;
+use schematics::symbols::file::File as FileSymbol;
+
+fn get_dir(content: Option<&str>) -> TempDir {
+  let tmp_dir = TempDir::new("unittest").expect("create temp dir");
+  if content.is_none() {
+    return tmp_dir;
+  }
+  let file_path = tmp_dir.path().join("filename");
+  let mut tmp_file = File::create(file_path).expect("create temp file");
+  tmp_file.write_all(content.unwrap().as_bytes()).expect("write temp file");
+  tmp_dir
+}
+
+fn get_symbol(path: &Path) -> FileSymbol<&str, String> {
+  FileSymbol::new(String::from(path.join("filename").to_str().unwrap()), "target content")
+}
+
+// Normal cases
+
+// Good
+#[test]
+fn already_reached() {
+  let dir = get_dir(Some("target content"));
+  let symbol = get_symbol(dir.path());
+
+  assert_eq!(symbol.target_reached().unwrap(), true);
+}
+
+// Bad
+#[test]
+fn wrong_prefix() {
+  let dir = get_dir(Some("not target content"));
+  let symbol = get_symbol(dir.path());
+
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  symbol.execute().unwrap();
+  assert_eq!(symbol.target_reached().unwrap(), true);
+}
+
+#[test]
+fn wrong_postfix() {
+  let dir = get_dir(Some("target content not"));
+  let symbol = get_symbol(dir.path());
+
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  symbol.execute().unwrap();
+  assert_eq!(symbol.target_reached().unwrap(), true);
+}
+
+#[test]
+fn empty_file() {
+  let dir = get_dir(Some(""));
+  let symbol = get_symbol(dir.path());
+
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  symbol.execute().unwrap();
+  assert_eq!(symbol.target_reached().unwrap(), true);
+}
+
+#[test]
+fn no_file() {
+  let dir = get_dir(None);
+  let symbol = get_symbol(dir.path());
+
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  symbol.execute().unwrap();
+  assert_eq!(symbol.target_reached().unwrap(), true);
+}
+
+// Exceptional cases
+
+#[test]
+fn may_not_read_file() {
+  let symbol = get_symbol(&Path::new("/etc/passwd"));
+
+  assert_eq!(symbol.target_reached().is_err(), true);
+}
+
+#[test]
+fn may_not_create_file() {
+  let symbol = get_symbol(&Path::new("/proc/somefile"));
+
+  // Could also return an error
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  assert!(symbol.execute().is_err());
+}
+
+#[test]
+fn directory_missing() {
+  let symbol = get_symbol(&Path::new("/nonexisting"));
+
+  // Could also return an error
+  assert_eq!(symbol.target_reached().unwrap(), false);
+  assert!(symbol.execute().is_err());
+}