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behavior: add coverage for no longer reproducing issue

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Closes #14305
This commit is contained in:
Jacob Young 2023-07-29 05:51:33 -04:00 committed by Andrew Kelley
parent 417b92f085
commit 8d1805f81c
2 changed files with 41 additions and 0 deletions
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1
test/behavior.zig
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@ -193,6 +193,7 @@ test {
_ = @import("behavior/optional.zig"); _ = @import("behavior/optional.zig");
_ = @import("behavior/packed-struct.zig"); _ = @import("behavior/packed-struct.zig");
_ = @import("behavior/packed_struct_explicit_backing_int.zig"); _ = @import("behavior/packed_struct_explicit_backing_int.zig");
_ = @import("behavior/packed-union.zig");
_ = @import("behavior/pointers.zig"); _ = @import("behavior/pointers.zig");
_ = @import("behavior/popcount.zig"); _ = @import("behavior/popcount.zig");
_ = @import("behavior/prefetch.zig"); _ = @import("behavior/prefetch.zig");

40
test/behavior/packed-union.zig Normal file
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@ -0,0 +1,40 @@
const std = @import("std");
const builtin = @import("builtin");
const expectEqual = std.testing.expectEqual;
test "flags in packed union" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
const FlagBits = packed struct(u8) {
enable_1: bool = false,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
other_flags: packed union {
flags: packed struct(u4) {
enable_1: bool = true,
enable_2: bool = false,
enable_3: bool = false,
enable_4: bool = false,
},
bits: u4,
} = .{ .flags = .{} },
};
var test_bits: FlagBits = .{};
try expectEqual(false, test_bits.enable_1);
try expectEqual(true, test_bits.other_flags.flags.enable_1);
test_bits.enable_1 = true;
try expectEqual(true, test_bits.enable_1);
try expectEqual(true, test_bits.other_flags.flags.enable_1);
test_bits.other_flags.flags.enable_1 = false;
try expectEqual(true, test_bits.enable_1);
try expectEqual(false, test_bits.other_flags.flags.enable_1);
}