fix: typeinfo enums (zig v0.14), add tests

Author: postspectacular

src/random.zig

@@ -7,21 +7,21 @@ pub const Sfc32 = @import("random/sfc32.zig");
 
 /// Returns uniformly distributed value in [-n..n) interval
 pub fn norm(comptime T: type, rnd: *Random, n: T) T {
-    std.debug.assert(@typeInfo(T) == .Float);
-    return rnd.float(T) * 2 * n - n;
+    std.debug.assert(@typeInfo(T) == .float);
+    return rnd.float(T) * 2.0 * n - n;
 }
 
 /// Returns uniformly distributed value in either the
 /// [min..max) or the (-max..-min] interval (same odds)
 pub fn normMinmax(comptime T: type, rnd: *Random, min: T, max: T) T {
-    std.debug.assert(@typeInfo(T) == .Float);
+    std.debug.assert(@typeInfo(T) == .float);
     const x = minmax(T, rnd, min, max);
     return if (rnd.int(u1) == 1) x else -x;
 }
 
 /// Returns uniformly distributed value in [min..max) interval
 pub fn minmax(comptime T: type, rnd: *Random, min: T, max: T) T {
-    std.debug.assert(@typeInfo(T) == .Float);
+    std.debug.assert(@typeInfo(T) == .float);
     return min + (max - min) * rnd.float(T);
 }
 
@@ -44,3 +44,12 @@ pub fn chance(rnd: *Random, prob: f32) bool {
 test {
     std.testing.refAllDecls(@This());
 }
+
+test "norm" {
+    var sfc = Sfc32.init(&.{ 1, 2, 3, 4 });
+    var rnd = Sfc32.random(&sfc);
+    try std.testing.expectApproxEqAbs(-1, norm(f32, &rnd, 1), 0.01);
+    try std.testing.expectApproxEqAbs(-0.89, norm(f32, &rnd, 1), 0.01);
+    try std.testing.expectApproxEqAbs(-1.06, normMinmax(f32, &rnd, 1, 2), 0.01);
+    try std.testing.expectApproxEqAbs(-1.30, normMinmax(f32, &rnd, 1, 2), 0.01);
+}