Add unit tests for the new IO meters

Added six new units tests related to the IO meters (Read, Write, and
Addendum). The first three tests check the meters under normal operation
, and the last three tests ensures that the parser throws an error,
unless one or more files where specified for the operation.

1 files changed, 74 insertions, 0 deletions

diff --git a/src/recite.rs b/src/recite.rs
index 12c98ae..05e49f3 100644
--- a/src/recite.rs
+++ b/src/recite.rs
@@ -1040,6 +1040,80 @@ mod tests {
     }
 
     #[test]
+    fn it_parses_verse_with_the_read_meter() {
+        let poem = Poem::read("lolcat < src/main.rs".to_string());
+        assert!(poem.is_some());
+        let mut verses = poem.unwrap().verses.into_iter();
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.verb(), "lolcat");
+        assert_eq!(verse.meter, Meter::Read);
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.stanza(), vec!["src/main.rs".to_string()]);
+    }
+
+    #[test]
+    fn it_parses_verse_with_the_write_meter() {
+        let poem = Poem::read("cat src/main.rs > /dev/null".to_string());
+        assert!(poem.is_some());
+        let mut verses = poem.unwrap().verses.into_iter();
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.verb(), "cat");
+        assert_eq!(verse.clause(), vec!["src/main.rs".to_string()]);
+        assert_eq!(verse.meter, Meter::Write);
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.stanza(), vec!["/dev/null".to_string()]);
+    }
+
+    #[test]
+    fn it_parses_verse_with_the_addenum_meter() {
+        let poem = Poem::read("cat src/main.rs >> /dev/null".to_string());
+        assert!(poem.is_some());
+        let mut verses = poem.unwrap().verses.into_iter();
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.verb(), "cat");
+        assert_eq!(verse.clause(), vec!["src/main.rs".to_string()]);
+        assert_eq!(verse.meter, Meter::Addendum);
+
+        let verse = verses.next().unwrap();
+        assert_eq!(verse.stanza(), vec!["/dev/null".to_string()]);
+    }
+
+    #[test]
+    fn it_throws_a_parse_error_if_no_files_are_specified_for_the_read_meter() {
+        let poem = Poem::read("lolcat <".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("lolcat <;".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("lolcat < && ls -la".to_string());
+        assert!(poem.is_none());
+    }
+
+    #[test]
+    fn it_throws_a_parse_error_if_no_files_are_specified_for_the_write_meter() {
+        let poem = Poem::read("cat src/main.rs >".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("cat src/main.rs >;".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("cat > && ls -la".to_string());
+        assert!(poem.is_none());
+    }
+
+    #[test]
+    fn it_throws_a_parse_error_if_no_files_are_specified_for_the_addendum_meter() {
+        let poem = Poem::read("cat src/main.rs >>".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("cat src/main.rs >>;".to_string());
+        assert!(poem.is_none());
+        let poem = Poem::read("cat >> && ls -la".to_string());
+        assert!(poem.is_none());
+    }
+
+    #[test]
     fn it_parses_a_complex_verse_with_lots_of_different_meters() {
         let poem = Poem::read("ls -la | lolcat && echo hello | lolcat && sleep 2 &".to_string());
         assert!(poem.is_some());