std.debug.assert: remove special case for test builds

Previously, std.debug.assert would `@panic` in test builds,
if the assertion failed. Now, it's always `unreachable`.

This makes release mode test builds more accurately test
the actual code that will be run.

However this requires tests to call `std.testing.expect`
rather than `std.debug.assert` to make sure output is correct.

Here is the explanation of when to use either one, copied from
the assert doc comments:

Inside a test block, it is best to use the `std.testing` module
rather than assert, because assert may not detect a test failure
in ReleaseFast and ReleaseSafe mode. Outside of a test block, assert
is the correct function to use.

closes #1304

1 files changed, 19 insertions, 19 deletions

diff --git a/std/math/trunc.zig b/std/math/trunc.zig
index bb309a1e24..8c91ccc568 100644
--- a/std/math/trunc.zig
+++ b/std/math/trunc.zig
@@ -6,7 +6,7 @@
 
 const std = @import("../index.zig");
 const math = std.math;
-const assert = std.debug.assert;
+const expect = std.testing.expect;
 const maxInt = std.math.maxInt;
 
 pub fn trunc(x: var) @typeOf(x) {
@@ -61,34 +61,34 @@ fn trunc64(x: f64) f64 {
 }
 
 test "math.trunc" {
-    assert(trunc(f32(1.3)) == trunc32(1.3));
-    assert(trunc(f64(1.3)) == trunc64(1.3));
+    expect(trunc(f32(1.3)) == trunc32(1.3));
+    expect(trunc(f64(1.3)) == trunc64(1.3));
 }
 
 test "math.trunc32" {
-    assert(trunc32(1.3) == 1.0);
-    assert(trunc32(-1.3) == -1.0);
-    assert(trunc32(0.2) == 0.0);
+    expect(trunc32(1.3) == 1.0);
+    expect(trunc32(-1.3) == -1.0);
+    expect(trunc32(0.2) == 0.0);
 }
 
 test "math.trunc64" {
-    assert(trunc64(1.3) == 1.0);
-    assert(trunc64(-1.3) == -1.0);
-    assert(trunc64(0.2) == 0.0);
+    expect(trunc64(1.3) == 1.0);
+    expect(trunc64(-1.3) == -1.0);
+    expect(trunc64(0.2) == 0.0);
 }
 
 test "math.trunc32.special" {
-    assert(trunc32(0.0) == 0.0); // 0x3F800000
-    assert(trunc32(-0.0) == -0.0);
-    assert(math.isPositiveInf(trunc32(math.inf(f32))));
-    assert(math.isNegativeInf(trunc32(-math.inf(f32))));
-    assert(math.isNan(trunc32(math.nan(f32))));
+    expect(trunc32(0.0) == 0.0); // 0x3F800000
+    expect(trunc32(-0.0) == -0.0);
+    expect(math.isPositiveInf(trunc32(math.inf(f32))));
+    expect(math.isNegativeInf(trunc32(-math.inf(f32))));
+    expect(math.isNan(trunc32(math.nan(f32))));
 }
 
 test "math.trunc64.special" {
-    assert(trunc64(0.0) == 0.0);
-    assert(trunc64(-0.0) == -0.0);
-    assert(math.isPositiveInf(trunc64(math.inf(f64))));
-    assert(math.isNegativeInf(trunc64(-math.inf(f64))));
-    assert(math.isNan(trunc64(math.nan(f64))));
+    expect(trunc64(0.0) == 0.0);
+    expect(trunc64(-0.0) == -0.0);
+    expect(math.isPositiveInf(trunc64(math.inf(f64))));
+    expect(math.isNegativeInf(trunc64(-math.inf(f64))));
+    expect(math.isNan(trunc64(math.nan(f64))));
 }