first integration test try

tests/delete_user_test.rs

@@ -0,0 +1,7 @@
+extern crate adduser;
+mod testfiles;
+
+#[test]
+fn test_test() {
+    assert_eq!(1, 1);
+}

tests/testfiles.rs

@@ -0,0 +1,46 @@
+use std::{env, path::Path};
+use std::{fs, path::PathBuf};
+
+use tempfile::TempDir;
+
+use std::ops::Deref;
+
+struct Fixture {
+    path: PathBuf,
+    source: PathBuf,
+    _tempdir: TempDir,
+}
+
+impl Fixture {
+    fn blank(fixture_filename: &str) -> Self {
+        // First, figure out the right file in `tests/fixtures/`:
+        let root_dir = &env::var("CARGO_MANIFEST_DIR").expect("$CARGO_MANIFEST_DIR");
+        let mut source = PathBuf::from(root_dir);
+        source.push("tests/fixtures");
+        source.push(&fixture_filename);
+
+        // The "real" path of the file is going to be under a temporary directory:
+        let tempdir = tempfile::tempdir().unwrap();
+        let mut path = PathBuf::from(&tempdir.path());
+        path.push(&fixture_filename);
+
+        Fixture {
+            _tempdir: tempdir,
+            source,
+            path,
+        }
+    }
+    fn copy(fixture_filename: &str) -> Self {
+        let fixture = Fixture::blank(fixture_filename);
+        fs::copy(&fixture.source, &fixture.path).unwrap();
+        fixture
+    }
+}
+
+impl Deref for Fixture {
+    type Target = Path;
+
+    fn deref(&self) -> &Self::Target {
+        self.path.deref()
+    }
+}