1 files changed, 149 insertions, 0 deletions
diff --git a/src/test/stdtest/four.rs b/src/test/stdtest/four.rs
new file mode 100644
index 00000000000..d0af7a393d3
--- /dev/null
+++ b/src/test/stdtest/four.rs
@@ -0,0 +1,149 @@
+use std;
+
+import std::tri;
+import std::four;
+
+fn eq1(a: four::t, b: four::t) -> bool { four::eq(a , b) }
+fn ne1(a: four::t, b: four::t) -> bool { four::ne(a , b) }
+
+fn eq2(a: four::t, b: four::t) -> bool { eq1( a, b ) && eq1( b, a ) }
+
+#[test]
+fn test_four_req_eq() {
+    four::all_values { |a|
+        four::all_values { |b|
+            assert if a == b { eq1( a, b ) } else { ne1( a, b ) };
+        }
+    }
+}
+
+#[test]
+fn test_four_and_symmetry() {
+    four::all_values { |a|
+        four::all_values { |b|
+            assert eq1( four::and(a ,b), four::and(b, a) );
+        }
+    }
+}
+
+#[test]
+fn test_four_xor_symmetry() {
+    four::all_values { |a|
+        four::all_values { |b|
+            assert eq1( four::and(a ,b), four::and(b, a) );
+        }
+    }
+}
+
+#[test]
+fn test_four_or_symmetry() {
+    four::all_values { |a|
+        four::all_values { |b|
+            assert eq1( four::or(a ,b), four::or(b, a) );
+        }
+    }
+}
+
+fn to_tup(v: four::t) -> (bool, bool) {
+    alt v {
+      0u8 { (false, false) }
+      1u8 { (false, true) }
+      2u8 { (true, false) }
+      3u8 { (true, true) }
+    }
+}
+
+#[test]
+fn test_four_not() {
+    four::all_values { |a|
+        let (x, y) = to_tup(a);
+        assert to_tup(four::not(a)) == (y, x);
+    };
+}
+
+
+#[test]
+fn test_four_and() {
+    four::all_values { |a|
+        four::all_values { |b|
+            let (y1, x1) = to_tup(a);
+            let (y2, x2) = to_tup(b);
+            let (y3, x3) = to_tup(four::and(a, b));
+
+            assert (x3, y3) == (x1 && x2, y1 || y2);
+        }
+    };
+}
+
+#[test]
+fn test_four_or() {
+    four::all_values { |a|
+        four::all_values { |b|
+            let (y1, x1) = to_tup(a);
+            let (y2, x2) = to_tup(b);
+            let (y3, x3) = to_tup(four::or(a, b));
+
+            assert (x3, y3) == (x1 || x2, y1 && y2);
+        }
+    };
+}
+
+#[test]
+fn test_four_implies() {
+    four::all_values { |a|
+        four::all_values { |b|
+            let (_, x1) = to_tup(a);
+            let (y2, x2) = to_tup(b);
+            let (y3, x3) = to_tup(four::implies(a, b));
+
+            assert (x3, y3) == (!x1 || x2, x1 && y2);
+        }
+    };
+}
+
+#[test]
+fn test_four_is_true() {
+    assert !four::is_true(four::none);
+    assert !four::is_true(four::false);
+    assert four::is_true(four::true);
+    assert four::is_true(four::both);
+}
+
+#[test]
+fn test_four_is_false() {
+    assert four::is_false(four::none);
+    assert four::is_false(four::false);
+    assert !four::is_false(four::true);
+    assert !four::is_false(four::both);
+}
+
+#[test]
+fn test_four_from_str() {
+    four::all_values { |v|
+        assert eq1( v, four::from_str(four::to_str(v)) );
+    }
+}
+
+#[test]
+fn test_four_to_str() {
+    assert four::to_str(four::none) == "none";
+    assert four::to_str(four::false) == "false";
+    assert four::to_str(four::true) == "true" ;
+    assert four::to_str(four::both) == "both";
+}
+
+#[test]
+fn test_four_to_tri() {
+    assert tri::eq( four::to_trit(four::true), tri::true );
+    assert tri::eq( four::to_trit(four::false), tri::false );
+    assert tri::eq( four::to_trit(four::none), tri::unknown );
+    log four::to_trit(four::both);
+    assert tri::eq( four::to_trit(four::both), tri::unknown );
+}
+
+#[test]
+fn test_four_to_bit() {
+    four::all_values { |v|
+        assert four::to_bit(v) == if four::is_true(v) { 1u8 } else { 0u8 };
+    }
+}
\ No newline at end of file