@spec assert_eq(left :: any(), right :: any(), opts :: [assert_eq_opts()]) :: any()

Asserts that the left and right values are equal. Returns the left value unless the assertion fails, or unless the :returning option is used.

Uses assert left == right under the hood.

Style note: the authors prefer to use assert in most cases, using assert_eq only when the extra options are helpful or when they want to make assertions in a pipeline.

Options:

• ignore_order: boolean - if the left and right values are lists, ignores the order when checking equality.
• returning: value - returns value if the assertion passes, rather than returning the left value.
• within: delta - asserts that the left and right values are within delta of each other.
• within: {delta, time_unit} - like within: delta but performs time comparisons in the specified time_unit. See Moar.Duration for more about time units. If left and right are strings, they are parsed as ISO8601 dates.

examples

Examples

iex> import Moar.Assertions

iex> %{a: 1} |> Map.put(:b, 2) |> assert_eq(%{a: 1, b: 2})
%{a: 1, b: 2}

iex> map = %{a: 1, b: 2}
iex> map |> Map.get(:a) |> assert_eq(1, returning: map)
%{a: 1, b: 2}

iex> assert_eq(4/28, 0.14, within: 0.01)
0.14285714285714285

iex> inserted_at = ~U[2022-01-02 03:00:00Z]
iex> updated_at = ~U[2022-01-02 03:04:00Z]
iex> assert_eq(inserted_at, updated_at, within: {10, :minute})
~U[2022-01-02 03:00:00Z]

iex> inserted_at = "2022-01-02T03:00:00Z"
iex> updated_at = "2022-01-02T03:04:00Z"
iex> assert_eq(inserted_at, updated_at, within: {10, :minute})
"2022-01-02T03:00:00Z"

@spec assert_recent(DateTime.t() | NaiveDateTime.t() | binary(), Moar.Duration.t()) ::
  DateTime.t() | NaiveDateTime.t() | binary()

Asserts that datetime is within recency of now (in UTC), returning datetime if the assertion succeeeds.

Uses assert_eq(datetime, now, within: recency) under the hood.

• datetime can be a DateTime, a NaiveDateTime, or an ISO8601-formatted UTC datetime string.
• recency is a Moar.Duration and defaults to {10, :second}.

five_seconds_ago = Moar.DateTime.add(DateTime.utc_now(), {-5, :second})
assert_recent five_seconds_ago

@spec assert_that(any(), [{:changes, any()} | {:from, any()} | {:to, any()}, ...]) ::
  {:__block__, [], [...]}

Asserts that a pre-condition and a post-condition are true after performing an action.

examples

Examples

{:ok, agent} = Agent.start(fn -> 0 end)

assert_that(Agent.update(agent, fn s -> s + 1 end),
  changes: Agent.get(agent, fn s -> s end),
  from: 0,
  to: 1
)