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add std.testing.expectStringEndsWith

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This commit is contained in:
Andrew Kelley
2020-12-08 21:54:46 -07:00
parent 72f6c6e634
commit 4592fd26b9
2 changed files with 23 additions and 2 deletions
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21
lib/std/testing.zig
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@@ -247,6 +247,7 @@ test "expectWithinEpsilon" {
/// 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.
/// If your inputs are UTF-8 encoded strings, consider calling `expectEqualStrings` instead.
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
@@ -368,6 +369,26 @@ pub fn expectEqualStrings(expected: []const u8, actual: []const u8) void {
}
}
pub fn expectStringEndsWith(actual: []const u8, expected_ends_with: []const u8) void {
if (std.mem.endsWith(u8, actual, expected_ends_with))
return;
const shortened_actual = if (actual.len >= expected_ends_with.len)
actual[0..expected_ends_with.len]
else
actual;
print("\n====== expected to end with: =========\n", .{});
printWithVisibleNewlines(expected_ends_with);
print("\n====== instead ended with: ===========\n", .{});
printWithVisibleNewlines(shortened_actual);
print("\n========= full output: ==============\n", .{});
printWithVisibleNewlines(actual);
print("\n======================================\n", .{});
@panic("test failure");
}
fn printIndicatorLine(source: []const u8, indicator_index: usize) void {
const line_begin_index = if (std.mem.lastIndexOfScalar(u8, source[0..indicator_index], '\n')) |line_begin|
line_begin + 1

4
test/cli.zig
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@@ -92,13 +92,13 @@ fn exec(cwd: []const u8, expect_0: bool, argv: []const []const u8) !ChildProcess
fn testZigInitLib(zig_exe: []const u8, dir_path: []const u8) !void {
_ = try exec(dir_path, true, &[_][]const u8{ zig_exe, "init-lib" });
const test_result = try exec(dir_path, true, &[_][]const u8{ zig_exe, "build", "test" });
testing.expect(std.mem.endsWith(u8, test_result.stderr, "All 1 tests passed.\n"));
testing.expectStringEndsWith(test_result.stderr, "All 1 tests passed.\n");
}
fn testZigInitExe(zig_exe: []const u8, dir_path: []const u8) !void {
_ = try exec(dir_path, true, &[_][]const u8{ zig_exe, "init-exe" });
const run_result = try exec(dir_path, true, &[_][]const u8{ zig_exe, "build", "run" });
testing.expect(std.mem.eql(u8, run_result.stderr, "info: All your codebase are belong to us.\n"));
testing.expectEqualStrings("info: All your codebase are belong to us.\n", run_result.stderr);
}
fn testGodboltApi(zig_exe: []const u8, dir_path: []const u8) anyerror!void {