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Merged
kotp merged 1 commit into from
Sep 26, 2025
Merged

Pascal's Triangle tests checkAllAllocationFailures #487

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14 changes: 12 additions & 2 deletions exercises/practice/pascals-triangle/.meta/example.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,23 @@ const mem = std.mem;

pub fn rows(allocator: mem.Allocator, count: usize) mem.Allocator.Error![][]u128 {
var result = try allocator.alloc([]u128, count);
for (0..count) |i| {
var i: usize = 0;
errdefer {
while (i > 0) {
i -= 1;
allocator.free(result[i]);
}
allocator.free(result);
}

while (i < count) : (i += 1) {
result[i] = try allocator.alloc(u128, i + 1);
result[i][0] = 1;
result[i][i] = 1;
if (i == 0) {
if (i < 2) {
continue;
}

for (1..i) |j| {
result[i][j] = result[i - 1][j - 1] + result[i - 1][j];
}
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128 changes: 53 additions & 75 deletions exercises/practice/pascals-triangle/test_pascals_triangle.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,8 @@ fn free(slices: [][]u128) void {
testing.allocator.free(slices);
}

test "zero rows" {
const expected = try testing.allocator.alloc([]const u128, 0);
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 0);
fn rowsTest(allocator: std.mem.Allocator, count: usize, expected: [][]const u128) anyerror!void {
const actual = try pascals_triangle.rows(allocator, count);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
Expand All @@ -23,107 +20,92 @@ test "zero rows" {
}
}

test "zero rows" {
const expected: [0][]const u128 = undefined;
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 0, &expected },
);
}

test "single row" {
var expected = try testing.allocator.alloc([]const u128, 1);
var expected: [1][]const u128 = undefined;
expected[0] = &.{1};
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 1);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 1, &expected },
);
}

test "two rows" {
var expected = try testing.allocator.alloc([]const u128, 2);
var expected: [2][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 2);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 2, &expected },
);
}

test "three rows" {
var expected = try testing.allocator.alloc([]const u128, 3);
var expected: [3][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
expected[2] = &.{ 1, 2, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 3);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 3, &expected },
);
}

test "four rows" {
var expected = try testing.allocator.alloc([]const u128, 4);
var expected: [4][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
expected[2] = &.{ 1, 2, 1 };
expected[3] = &.{ 1, 3, 3, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 4);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 4, &expected },
);
}

test "five rows" {
var expected = try testing.allocator.alloc([]const u128, 5);
var expected: [5][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
expected[2] = &.{ 1, 2, 1 };
expected[3] = &.{ 1, 3, 3, 1 };
expected[4] = &.{ 1, 4, 6, 4, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 5);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 5, &expected },
);
}

test "six rows" {
var expected = try testing.allocator.alloc([]const u128, 6);
var expected: [6][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
expected[2] = &.{ 1, 2, 1 };
expected[3] = &.{ 1, 3, 3, 1 };
expected[4] = &.{ 1, 4, 6, 4, 1 };
expected[5] = &.{ 1, 5, 10, 10, 5, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 6);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 6, &expected },
);
}

test "ten rows" {
var expected = try testing.allocator.alloc([]const u128, 10);
var expected: [10][]const u128 = undefined;
expected[0] = &.{1};
expected[1] = &.{ 1, 1 };
expected[2] = &.{ 1, 2, 1 };
Expand All @@ -134,15 +116,11 @@ test "ten rows" {
expected[7] = &.{ 1, 7, 21, 35, 35, 21, 7, 1 };
expected[8] = &.{ 1, 8, 28, 56, 70, 56, 28, 8, 1 };
expected[9] = &.{ 1, 9, 36, 84, 126, 126, 84, 36, 9, 1 };
defer testing.allocator.free(expected);

const actual = try pascals_triangle.rows(testing.allocator, 10);
defer free(actual);

try testing.expectEqual(expected.len, actual.len);
for (expected, actual) |expected_slice, actual_slice| {
try testing.expectEqualSlices(u128, expected_slice, actual_slice);
}
try std.testing.checkAllAllocationFailures(
std.testing.allocator,
rowsTest,
.{ 10, &expected },
);
}

test "seventy-five rows" {
Expand Down