An easy-to-use assertion library for Python

## Project description

insist

======

An easy-to-use assertion library for python.

Quick Start

===========

Install insist

--------------

```

$ pip install insist

```

or

```

$ sudo pip install insist

```

Create Insist object

--------------------

```python

from insist import Insist

insist = Insist()

# Raise RuntimeError instead of AssertionError

insist_rt = Insist(RuntimeError)

# Prefix all messages with "OOPS : "

insist_prefix = Insist(message_prefix="OOPS")

# Show both custom and standard error messages

# Can be combined with message_prefix

insist_both = Insist(always_show_standard=True)

```

Make assertions

---------------

```python

insist.true(1 == 1) # Valid assertion

insist(1 == 1) # Same as insist.true(expr)

insist(1 == 2) # Raises AssertionError

# Raises AssertionError with custom error message

insist(1 == 2, "Danger, Will Robinson")

# Raises AssertionError with custom and standard error message joined with " : "

insist_both(1 == 2, "Danger, Will Robinson")

```

Reference

=========

All tests

---------

```python

from insist import Insist

insist = Insist()

insist(x) # x == True

insist.true(x) # x == True

insist.false(x) # x == False

insist.equal(x, y) # x == y

insist.not_equal(x, y) # x != y

insist.less(x, y) # x < y

insist.less_equal(x, y) # x <= y

insist.greater(x, y) # x > y

insist.greater_equal(x, y) # x >= y

insist.is_same(x, y) # x is y

insist.is_not(x, y) # x is not y

insist.is_in(x, y) # x in y

insist.not_in(x, y) # x not in y

insist.is_subclass(x, y) # issubclass(x, y)

insist.is_not_subclass(x, y) # not issubclass(x, y)

insist.isa(x, y) # isinstance(x, y)

insist.is_not_a(x, y) # not isinstance(x, y)

# Dict used for remaining examples

x = { 'a' : 1, 'b' : 2, 'c' : 3 }

# Require that x has listed keys with additional keys allowed.

insist.keys(x, required=['a', 'b']) # OK

insist.keys(x, required=['a', 'd']) # Raises error

# Require that x has listed keys with additional keys not allowed.

insist.keys(x, required=['a', 'b'], extra=False) # Raises error

# Require that x has listed keys but no keys other than optional keys allowed.

insist.keys(x, required=['a', 'b'], optional=['c']) # OK

insist.keys(x, required=['a', 'b'], optional=['d']) # Raises error

```

Chainable Tests

---------------

```python

from insist import Insist

insist = Insist()

# The "that" method retains its value as the first value for the remaining methods in chain

insist.that(x).isa(int).greater_equal(0).less(10) # OK if x is integer from 0 to 9

# In addition to the methods listed above, a "that chain" has two additional methods.

# The has and not_has methods are similar to is_in and not_in except that the

# arguments are reversed.

x = [ 1, 2, 3 ]

insist.that(x).has(1).has(2) # OK

insist.that(x).has(1).not_has(2) # Raises error

insist.that(x).has(1).has(5) # Raises error

x = { 'a' : 1, 'b' : 2, 'c' : 3 }

insist.that(x).has('a').has('b') # OK

insist.that(x).has('a').has('d') # Raises error

```

Copyright and License

=====================

Copyright 2014 Ray Harris

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this module except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

======

An easy-to-use assertion library for python.

Quick Start

===========

Install insist

--------------

```

$ pip install insist

```

or

```

$ sudo pip install insist

```

Create Insist object

--------------------

```python

from insist import Insist

insist = Insist()

# Raise RuntimeError instead of AssertionError

insist_rt = Insist(RuntimeError)

# Prefix all messages with "OOPS : "

insist_prefix = Insist(message_prefix="OOPS")

# Show both custom and standard error messages

# Can be combined with message_prefix

insist_both = Insist(always_show_standard=True)

```

Make assertions

---------------

```python

insist.true(1 == 1) # Valid assertion

insist(1 == 1) # Same as insist.true(expr)

insist(1 == 2) # Raises AssertionError

# Raises AssertionError with custom error message

insist(1 == 2, "Danger, Will Robinson")

# Raises AssertionError with custom and standard error message joined with " : "

insist_both(1 == 2, "Danger, Will Robinson")

```

Reference

=========

All tests

---------

```python

from insist import Insist

insist = Insist()

insist(x) # x == True

insist.true(x) # x == True

insist.false(x) # x == False

insist.equal(x, y) # x == y

insist.not_equal(x, y) # x != y

insist.less(x, y) # x < y

insist.less_equal(x, y) # x <= y

insist.greater(x, y) # x > y

insist.greater_equal(x, y) # x >= y

insist.is_same(x, y) # x is y

insist.is_not(x, y) # x is not y

insist.is_in(x, y) # x in y

insist.not_in(x, y) # x not in y

insist.is_subclass(x, y) # issubclass(x, y)

insist.is_not_subclass(x, y) # not issubclass(x, y)

insist.isa(x, y) # isinstance(x, y)

insist.is_not_a(x, y) # not isinstance(x, y)

# Dict used for remaining examples

x = { 'a' : 1, 'b' : 2, 'c' : 3 }

# Require that x has listed keys with additional keys allowed.

insist.keys(x, required=['a', 'b']) # OK

insist.keys(x, required=['a', 'd']) # Raises error

# Require that x has listed keys with additional keys not allowed.

insist.keys(x, required=['a', 'b'], extra=False) # Raises error

# Require that x has listed keys but no keys other than optional keys allowed.

insist.keys(x, required=['a', 'b'], optional=['c']) # OK

insist.keys(x, required=['a', 'b'], optional=['d']) # Raises error

```

Chainable Tests

---------------

```python

from insist import Insist

insist = Insist()

# The "that" method retains its value as the first value for the remaining methods in chain

insist.that(x).isa(int).greater_equal(0).less(10) # OK if x is integer from 0 to 9

# In addition to the methods listed above, a "that chain" has two additional methods.

# The has and not_has methods are similar to is_in and not_in except that the

# arguments are reversed.

x = [ 1, 2, 3 ]

insist.that(x).has(1).has(2) # OK

insist.that(x).has(1).not_has(2) # Raises error

insist.that(x).has(1).has(5) # Raises error

x = { 'a' : 1, 'b' : 2, 'c' : 3 }

insist.that(x).has('a').has('b') # OK

insist.that(x).has('a').has('d') # Raises error

```

Copyright and License

=====================

Copyright 2014 Ray Harris

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this module except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

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Filename, size & hash SHA256 hash help | File type | Python version | Upload date |
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