ziglings/test/tests.zig

414 lines
12 KiB
Zig

const std = @import("std");
const root = @import("../build.zig");
const debug = std.debug;
const fmt = std.fmt;
const fs = std.fs;
const mem = std.mem;
const Allocator = std.mem.Allocator;
const Child = std.process.Child;
const Build = std.Build;
const LazyPath = std.Build.LazyPath;
const Reader = fs.File.Reader;
const RunStep = std.Build.RunStep;
const Step = Build.Step;
const Exercise = root.Exercise;
pub fn addCliTests(b: *std.Build, exercises: []const Exercise) *Step {
const step = b.step("test-cli", "Test the command line interface");
{
// Test that `zig build -Dhealed -Dn=n` selects the nth exercise.
const case_step = createCase(b, "case-1");
const tmp_path = makeTempPath(b) catch |err| {
return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)});
};
const heal_step = HealStep.create(b, exercises, tmp_path);
for (exercises[0 .. exercises.len - 1]) |ex| {
const n = ex.number();
const cmd = b.addSystemCommand(&.{
b.graph.zig_exe,
"build",
"-Dhealed",
b.fmt("-Dhealed-path={s}", .{tmp_path}),
b.fmt("-Dn={}", .{n}),
});
cmd.setName(b.fmt("zig build -Dhealed -Dn={}", .{n}));
cmd.expectExitCode(0);
cmd.step.dependOn(&heal_step.step);
const stderr = cmd.captureStdErr();
const verify = CheckNamedStep.create(b, ex, stderr);
verify.step.dependOn(&cmd.step);
case_step.dependOn(&verify.step);
}
const cleanup = b.addRemoveDirTree(tmp_path);
cleanup.step.dependOn(case_step);
step.dependOn(&cleanup.step);
}
{
// Test that `zig build -Dhealed` processes all the exercises in order.
const case_step = createCase(b, "case-2");
const tmp_path = makeTempPath(b) catch |err| {
return fail(step, "unable to make tmp path: {s}\n", .{@errorName(err)});
};
const heal_step = HealStep.create(b, exercises, tmp_path);
heal_step.step.dependOn(case_step);
// TODO: when an exercise is modified, the cache is not invalidated.
const cmd = b.addSystemCommand(&.{
b.graph.zig_exe,
"build",
"-Dhealed",
b.fmt("-Dhealed-path={s}", .{tmp_path}),
});
cmd.setName("zig build -Dhealed");
cmd.expectExitCode(0);
cmd.step.dependOn(&heal_step.step);
const stderr = cmd.captureStdErr();
const verify = CheckStep.create(b, exercises, stderr);
verify.step.dependOn(&cmd.step);
const cleanup = b.addRemoveDirTree(tmp_path);
cleanup.step.dependOn(&verify.step);
step.dependOn(&cleanup.step);
}
{
// Test that `zig build -Dn=n` prints the hint.
const case_step = createCase(b, "case-3");
for (exercises[0 .. exercises.len - 1]) |ex| {
if (ex.skip) continue;
if (ex.hint) |hint| {
const n = ex.number();
const cmd = b.addSystemCommand(&.{
b.graph.zig_exe,
"build",
b.fmt("-Dn={}", .{n}),
});
cmd.setName(b.fmt("zig build -Dn={}", .{n}));
cmd.expectExitCode(2);
cmd.addCheck(.{ .expect_stderr_match = hint });
case_step.dependOn(&cmd.step);
}
}
step.dependOn(case_step);
}
return step;
}
fn createCase(b: *Build, name: []const u8) *Step {
const case_step = b.allocator.create(Step) catch @panic("OOM");
case_step.* = Step.init(.{
.id = .custom,
.name = name,
.owner = b,
});
return case_step;
}
/// Checks the output of `zig build -Dn=n`.
const CheckNamedStep = struct {
step: Step,
exercise: Exercise,
stderr: LazyPath,
pub fn create(owner: *Build, exercise: Exercise, stderr: LazyPath) *CheckNamedStep {
const self = owner.allocator.create(CheckNamedStep) catch @panic("OOM");
self.* = .{
.step = Step.init(.{
.id = .custom,
.name = "check-named",
.owner = owner,
.makeFn = make,
}),
.exercise = exercise,
.stderr = stderr,
};
return self;
}
fn make(step: *Step, _: std.Progress.Node) !void {
const b = step.owner;
const self: *CheckNamedStep = @alignCast(@fieldParentPtr("step", step));
const ex = self.exercise;
const stderr_file = try fs.cwd().openFile(
self.stderr.getPath(b),
.{ .mode = .read_only },
);
defer stderr_file.close();
const stderr = stderr_file.reader();
{
// Skip the logo.
const nlines = mem.count(u8, root.logo, "\n");
var buf: [80]u8 = undefined;
var lineno: usize = 0;
while (lineno < nlines) : (lineno += 1) {
_ = try readLine(stderr, &buf);
}
}
try check_output(step, ex, stderr);
}
};
/// Checks the output of `zig build`.
const CheckStep = struct {
step: Step,
exercises: []const Exercise,
stderr: LazyPath,
pub fn create(
owner: *Build,
exercises: []const Exercise,
stderr: LazyPath,
) *CheckStep {
const self = owner.allocator.create(CheckStep) catch @panic("OOM");
self.* = .{
.step = Step.init(.{
.id = .custom,
.name = "check",
.owner = owner,
.makeFn = make,
}),
.exercises = exercises,
.stderr = stderr,
};
return self;
}
fn make(step: *Step, _: std.Progress.Node) !void {
const b = step.owner;
const self: *CheckStep = @alignCast(@fieldParentPtr("step", step));
const exercises = self.exercises;
const stderr_file = try fs.cwd().openFile(
self.stderr.getPath(b),
.{ .mode = .read_only },
);
defer stderr_file.close();
const stderr = stderr_file.reader();
for (exercises) |ex| {
if (ex.number() == 1) {
// Skip the logo.
const nlines = mem.count(u8, root.logo, "\n");
var buf: [80]u8 = undefined;
var lineno: usize = 0;
while (lineno < nlines) : (lineno += 1) {
_ = try readLine(stderr, &buf);
}
}
try check_output(step, ex, stderr);
}
}
};
fn check_output(step: *Step, exercise: Exercise, reader: Reader) !void {
const b = step.owner;
var buf: [1024]u8 = undefined;
if (exercise.skip) {
{
const actual = try readLine(reader, &buf) orelse "EOF";
const expect = b.fmt("Skipping {s}", .{exercise.main_file});
try check(step, exercise, expect, actual);
}
{
const actual = try readLine(reader, &buf) orelse "EOF";
try check(step, exercise, "", actual);
}
return;
}
{
const actual = try readLine(reader, &buf) orelse "EOF";
const expect = b.fmt("Compiling {s}...", .{exercise.main_file});
try check(step, exercise, expect, actual);
}
{
const actual = try readLine(reader, &buf) orelse "EOF";
const expect = b.fmt("Checking {s}...", .{exercise.main_file});
try check(step, exercise, expect, actual);
}
{
const actual = try readLine(reader, &buf) orelse "EOF";
const expect = switch (exercise.kind) {
.exe => "PASSED:",
.@"test" => "PASSED",
};
try check(step, exercise, expect, actual);
}
// Skip the exercise output.
const nlines = switch (exercise.kind) {
.exe => 1 + mem.count(u8, exercise.output, "\n") + 1,
.@"test" => 1,
};
var lineno: usize = 0;
while (lineno < nlines) : (lineno += 1) {
_ = try readLine(reader, &buf) orelse @panic("EOF");
}
}
fn check(
step: *Step,
exercise: Exercise,
expect: []const u8,
actual: []const u8,
) !void {
if (!mem.eql(u8, expect, actual)) {
return step.fail("{s}: expected to see \"{s}\", found \"{s}\"", .{
exercise.main_file,
expect,
actual,
});
}
}
fn readLine(reader: fs.File.Reader, buf: []u8) !?[]const u8 {
if (try reader.readUntilDelimiterOrEof(buf, '\n')) |line| {
return mem.trimRight(u8, line, " \r\n");
}
return null;
}
/// Fails with a custom error message.
const FailStep = struct {
step: Step,
error_msg: []const u8,
pub fn create(owner: *Build, error_msg: []const u8) *FailStep {
const self = owner.allocator.create(FailStep) catch @panic("OOM");
self.* = .{
.step = Step.init(.{
.id = .custom,
.name = "fail",
.owner = owner,
.makeFn = make,
}),
.error_msg = error_msg,
};
return self;
}
fn make(step: *Step, _: std.Progress.Node) !void {
const b = step.owner;
const self: *FailStep = @alignCast(@fieldParentPtr("step", step));
try step.result_error_msgs.append(b.allocator, self.error_msg);
return error.MakeFailed;
}
};
/// A variant of `std.Build.Step.fail` that does not return an error so that it
/// can be used in the configuration phase. It returns a FailStep, so that the
/// error will be cleanly handled by the build runner.
fn fail(step: *Step, comptime format: []const u8, args: anytype) *Step {
const b = step.owner;
const fail_step = FailStep.create(b, b.fmt(format, args));
step.dependOn(&fail_step.step);
return step;
}
/// Heals the exercises.
const HealStep = struct {
step: Step,
exercises: []const Exercise,
work_path: []const u8,
pub fn create(owner: *Build, exercises: []const Exercise, work_path: []const u8) *HealStep {
const self = owner.allocator.create(HealStep) catch @panic("OOM");
self.* = .{
.step = Step.init(.{
.id = .custom,
.name = "heal",
.owner = owner,
.makeFn = make,
}),
.exercises = exercises,
.work_path = work_path,
};
return self;
}
fn make(step: *Step, _: std.Progress.Node) !void {
const b = step.owner;
const self: *HealStep = @alignCast(@fieldParentPtr("step", step));
return heal(b.allocator, self.exercises, self.work_path);
}
};
/// Heals all the exercises.
fn heal(allocator: Allocator, exercises: []const Exercise, work_path: []const u8) !void {
const sep = std.fs.path.sep_str;
const join = fs.path.join;
const exercises_path = "exercises";
const patches_path = "patches" ++ sep ++ "patches";
for (exercises) |ex| {
const name = ex.name();
const file = try join(allocator, &.{ exercises_path, ex.main_file });
const patch = b: {
const patch_name = try fmt.allocPrint(allocator, "{s}.patch", .{name});
break :b try join(allocator, &.{ patches_path, patch_name });
};
const output = try join(allocator, &.{ work_path, ex.main_file });
const argv = &.{ "patch", "-i", patch, "-o", output, "-s", file };
var child = Child.init(argv, allocator);
_ = try child.spawnAndWait();
}
}
/// This function is the same as the one in std.Build.makeTempPath, with the
/// difference that returns an error when the temp path cannot be created.
pub fn makeTempPath(b: *Build) ![]const u8 {
const rand_int = std.crypto.random.int(u64);
const tmp_dir_sub_path = "tmp" ++ fs.path.sep_str ++ Build.hex64(rand_int);
const path = b.cache_root.join(b.allocator, &.{tmp_dir_sub_path}) catch
@panic("OOM");
try b.cache_root.handle.makePath(tmp_dir_sub_path);
return path;
}