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Add expectWithinMargin and test

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antlilja 2020-06-23 18:05:32 +02:00
parent 5229f6ec68
commit 2fc2355fc3
1 changed files with 26 additions and 0 deletions
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26
lib/std/testing.zig
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@ -168,6 +168,32 @@ test "expectEqual.union(enum)" {
expectEqual(a10, a10);
}
/// This function is intended to be used only in tests. When the actual value is not
/// within the margin of the expected value,
/// prints diagnostics to stderr to show exactly how they are not equal, then aborts.
/// The types must be floating point
pub fn expectWithinMargin(expected: var, actual: @TypeOf(expected), margin: @TypeOf(expected)) void {
std.debug.assert(margin >= 0.0);
switch (@typeInfo(@TypeOf(actual))) {
.Float,
.ComptimeFloat,
=> {
if (@fabs(expected - actual) > margin) {
std.debug.panic("actual {}, not within margin {} of expected {}", .{ actual, margin, expected });
}
},
else => @compileError("Unable to compare non floating point values"),
}
}
test "expectWithinMargin.f32" {
const x: f32 = 12.0;
const y: f32 = 12.06;
expectWithinMargin(x, y, 0.1);
}
/// This function is intended to be used only in tests. When the two slices are not
/// equal, prints diagnostics to stderr to show exactly how they are not equal,
/// then aborts.