Add minimalistic integration tests

src/metadata/mod.rs

@@ -73,10 +73,13 @@ pub fn read_nrg_metadata(fd: &mut File) -> Result<NrgMetadata, NrgError> {
 
 /// Determines the NRG format of an open NRG image `fd` of file `file_size`.
 ///
+/// `fd`'s offset at call-time doesn't matter, as this function will seek to
+/// read the relevant data.
+///
 /// The offset is left after the main chunk ID, therefore the calling function
 /// can read the first data chunk's offset (32 bits for NRG v1 or 64 bits for
 /// NRG v2) directly without seeking.
-fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
+pub fn read_nrg_version(fd: &mut File, file_size: u64) -> Result<u8, NrgError> {
     if file_size < 12 {
         // Input file too small
         return Err(NrgError::NrgFormat(

tests/nrg_v1.rs

@@ -0,0 +1,19 @@
+extern crate nrgrip;
+use nrgrip::metadata;
+use std::fs::File;
+use std::io::{Seek, SeekFrom};
+use std::path::PathBuf;
+
+#[test]
+fn nrg_format() {
+    let mut img = PathBuf::new();
+    img.push("tests");
+    img.push("minimal_v1.nrg");
+    let mut fd = File::open(img)
+        .expect("File::open()");
+    let size = fd.seek(SeekFrom::End(0))
+        .expect("fd.seek()");
+    let ver = metadata::read_nrg_version(&mut fd, size)
+        .expect("read_nrg_version()");
+    assert_eq!(ver, 1);
+}

tests/nrg_v2.rs

@@ -0,0 +1,19 @@
+extern crate nrgrip;
+use nrgrip::metadata;
+use std::fs::File;
+use std::io::{Seek, SeekFrom};
+use std::path::PathBuf;
+
+#[test]
+fn nrg_format() {
+    let mut img = PathBuf::new();
+    img.push("tests");
+    img.push("minimal_v2.nrg");
+    let mut fd = File::open(img)
+        .expect("File::open()");
+    let size = fd.seek(SeekFrom::End(0))
+        .expect("fd.seek()");
+    let ver = metadata::read_nrg_version(&mut fd, size)
+        .expect("read_nrg_version()");
+    assert_eq!(ver, 2);
+}