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const builtin = @import("builtin");
const TypeId = builtin.TypeId;
const std = @import("index.zig");
/// This function is intended to be used only in tests. It prints diagnostics to stderr
/// and then aborts when actual_error_union is not expected_error.
pub fn expectError(expected_error: anyerror, actual_error_union: var) void {
// TODO remove the workaround here for https://github.com/ziglang/zig/issues/1936
if (actual_error_union) |actual_payload| {
// TODO remove workaround here for https://github.com/ziglang/zig/issues/557
if (@sizeOf(@typeOf(actual_payload)) == 0) {
std.debug.panic("expected error.{}, found {} value", @errorName(expected_error), @typeName(@typeOf(actual_payload)));
} else {
std.debug.panic("expected error.{}, found {}", @errorName(expected_error), actual_payload);
}
} else |actual_error| {
if (expected_error != actual_error) {
std.debug.panic("expected error.{}, found error.{}", @errorName(expected_error), @errorName(actual_error));
}
}
}
/// This function is intended to be used only in tests. When the two values are not
/// equal, prints diagnostics to stderr to show exactly how they are not equal,
/// then aborts.
/// The types must match exactly.
pub fn expectEqual(expected: var, actual: @typeOf(expected)) void {
switch (@typeInfo(@typeOf(actual))) {
TypeId.NoReturn,
TypeId.BoundFn,
TypeId.ArgTuple,
TypeId.Opaque,
=> @compileError("value of type " ++ @typeName(@typeOf(actual)) ++ " encountered"),
TypeId.Undefined,
TypeId.Null,
TypeId.Void,
=> return,
TypeId.Type,
TypeId.Bool,
TypeId.Int,
TypeId.Float,
TypeId.ComptimeFloat,
TypeId.ComptimeInt,
TypeId.Enum,
TypeId.Namespace,
TypeId.Fn,
TypeId.Promise,
TypeId.Vector,
TypeId.ErrorSet,
=> {
if (actual != expected) {
std.debug.panic("expected {}, found {}", expected, actual);
}
},
TypeId.Pointer => |pointer| {
switch (pointer.size) {
builtin.TypeInfo.Pointer.Size.One,
builtin.TypeInfo.Pointer.Size.Many,
=> {
if (actual != expected) {
std.debug.panic("expected {}, found {}", expected, actual);
}
},
builtin.TypeInfo.Pointer.Size.Slice => {
if (actual.ptr != expected.ptr) {
std.debug.panic("expected slice ptr {}, found {}", expected.ptr, actual.ptr);
}
if (actual.len != expected.len) {
std.debug.panic("expected slice len {}, found {}", expected.len, actual.len);
}
},
}
},
TypeId.Array => |array| expectEqualSlices(array.child, &expected, &actual),
TypeId.Struct => {
@compileError("TODO implement testing.expectEqual for structs");
},
TypeId.Union => |union_info| {
if (union_info.tag_type == null) {
@compileError("Unable to compare untagged union values");
}
@compileError("TODO implement testing.expectEqual for tagged unions");
},
TypeId.Optional => {
if (expected) |expected_payload| {
if (actual) |actual_payload| {
expectEqual(expected_payload, actual_payload);
} else {
std.debug.panic("expected {}, found null", expected_payload);
}
} else {
if (actual) |actual_payload| {
std.debug.panic("expected null, found {}", actual_payload);
}
}
},
TypeId.ErrorUnion => {
if (expected) |expected_payload| {
if (actual) |actual_payload| {
expectEqual(expected_payload, actual_payload);
} else |actual_err| {
std.debug.panic("expected {}, found {}", expected_payload, actual_err);
}
} else |expected_err| {
if (actual) |actual_payload| {
std.debug.panic("expected {}, found {}", expected_err, actual_payload);
} else |actual_err| {
expectEqual(expected_err, actual_err);
}
}
},
}
}
/// 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.
pub fn expectEqualSlices(comptime T: type, expected: []const T, actual: []const T) void {
// TODO better printing of the difference
// If the arrays are small enough we could print the whole thing
// If the child type is u8 and no weird bytes, we could print it as strings
// Even for the length difference, it would be useful to see the values of the slices probably.
if (expected.len != actual.len) {
std.debug.panic("slice lengths differ. expected {}, found {}", expected.len, actual.len);
}
var i: usize = 0;
while (i < expected.len) : (i += 1) {
if (expected[i] != actual[i]) {
std.debug.panic("index {} incorrect. expected {}, found {}", i, expected[i], actual[i]);
}
}
}
/// This function is intended to be used only in tests. When `ok` is false, the test fails.
/// A message is printed to stderr and then abort is called.
pub fn expect(ok: bool) void {
if (!ok) @panic("test failure");
}
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