X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=tests%2Ftest_lib.rs;h=af9bbe25b980e3372f1232e43ccea731b0536da2;hp=44d7f87cee54405631e9412ced6542eec01eaed6;hb=b756cb948f64416c2f5fd280a971bc7daa3bddea;hpb=cf414916b6551e102ebf120866ef461d47c535bd

diff --git a/tests/test_lib.rs b/tests/test_lib.rs
index 44d7f87..af9bbe2 100644
--- a/tests/test_lib.rs
+++ b/tests/test_lib.rs
@@ -1,3 +1,6 @@
+#[macro_use]
+extern crate global_counter;
+
 use learning::*;
 
 #[test]
@@ -6,3 +9,43 @@ fn test_longest() {
     assert_eq!(longest("abc", "def"), "def");
     assert_eq!(longest("abc", "defg"), "defg");
 }
+
+#[test]
+fn test_cacher_int_int() {
+    global_default_counter!(CALLED, u32);
+    let mut cacher = Cacher::new(|x| {
+        CALLED.inc();
+        2 * x
+    });
+    assert_eq!(cacher.value(1), 2);
+    assert_eq!(CALLED.get_cloned(), 1);
+    // second time cached
+    assert_eq!(cacher.value(1), 2);
+    assert_eq!(CALLED.get_cloned(), 1);
+    // re-evaluated for new value
+    assert_eq!(cacher.value(-2), -4);
+    assert_eq!(CALLED.get_cloned(), 2);
+    // old arg still cached
+    assert_eq!(cacher.value(1), 2);
+    assert_eq!(CALLED.get_cloned(), 2);
+}
+
+#[test]
+fn test_cacher_str_usize() {
+    global_default_counter!(CALLED, u32);
+    let mut cacher = Cacher::new(|x: &str| {
+        CALLED.inc();
+        x.len()
+    });
+    assert_eq!(cacher.value("abc"), 3);
+    assert_eq!(CALLED.get_cloned(), 1);
+    // second time cached
+    assert_eq!(cacher.value("abc"), 3);
+    assert_eq!(CALLED.get_cloned(), 1);
+    // re-evaluated for new value
+    assert_eq!(cacher.value("defg"), 4);
+    assert_eq!(CALLED.get_cloned(), 2);
+    // old arg still cached
+    assert_eq!(cacher.value("abc"), 3);
+    assert_eq!(CALLED.get_cloned(), 2);
+}