1const negv = @import("negv.zig");
 2const testing = @import("std").testing;
 3
 4fn test__negvdi2(a: i64, expected: i64) !void {
 5    const result = negv.__negvdi2(a);
 6    try testing.expectEqual(expected, result);
 7}
 8
 9test "negvdi2" {
10    // -2^63 <= i64 <= 2^63-1
11    // 2^63 = 9223372036854775808
12    // 2^63-1 = 9223372036854775807
13    // TODO write panic handler for testing panics
14    //try test__negvdi2(-9223372036854775808, -5); // tested with return -5; and panic
15    try test__negvdi2(-9223372036854775807, 9223372036854775807);
16    try test__negvdi2(-9223372036854775806, 9223372036854775806);
17    try test__negvdi2(-9223372036854775805, 9223372036854775805);
18    try test__negvdi2(-9223372036854775804, 9223372036854775804);
19    try test__negvdi2(-42, 42);
20    try test__negvdi2(-7, 7);
21    try test__negvdi2(-1, 1);
22    try test__negvdi2(0, 0);
23    try test__negvdi2(1, -1);
24    try test__negvdi2(7, -7);
25    try test__negvdi2(42, -42);
26    try test__negvdi2(9223372036854775804, -9223372036854775804);
27    try test__negvdi2(9223372036854775805, -9223372036854775805);
28    try test__negvdi2(9223372036854775806, -9223372036854775806);
29    try test__negvdi2(9223372036854775807, -9223372036854775807);
30}