Package: preggy
preggypreggy is an assertion library for Python.What were youexpecting?Extracted from thePyVowsproject.InstallingWe recommend usingpip:pip install preggyUsageSimply tell your test what toexpect():frompreggyimportexpectdeftest_roses_are_red():rose=Rose()expect(rose.color).to_equal('red')deftest_violets_are_not_red():violet=Violet()expect(violet.color).not_to_equal('red')Built-in ExpectationsEqualityexpect(4).to_equal(4)expect(5).Not.to_equal(4)expect(5).not_to_equal(4)# same as previousComparisonexpect(4).to_be_lesser_than(5)expect(5).to_be_greater_than(4)expect(5).Not.to_be_lesser_than(4)expect(4).not_to_be_greater(5)# same as previousexpect(4).to_be_lesser_or_equal_to(5)expect(4).to_be_lesser_or_equal_to(4)expect(5).not_to_be_lesser_or_equal_to(4)expect(5).to_be_greater_or_equal_to(4)expect(5).to_be_greater_or_equal_to(5)expect(4).not_to_be_greater_or_equal_to(5)expect("b").to_be_greater_than("a")expect("a").to_be_lesser_than("b")expect([1,2,3]).to_be_greater_than([1,2])# comparing using lengthexpect((1,2,3)).to_be_greater_than((1,2))# comparing using lengthexpect({"a":"b","c":"d"}).to_be_greater_than({"a":"b"})# comparing using length of keysSimilarityexpect('sOmE RandOm     CAse StRiNG').to_be_like('some random case string')expect(1).to_be_like(1)expect(1).to_be_like(1.0)expect(1).to_be_like(long(1))expect([1,2,3]).to_be_like([3,2,1])expect([1,2,3]).to_be_like((3,2,1))expect([[1,2],[3,4]]).to_be_like([4,3],[2,1]])expect({'some':1,'key':2}).to_be_like({'key':2,'some':1})expect('sOmE RandOm     CAse StRiNG').Not.to_be_like('other string')expect('sOmE RandOm     CAse StRiNG').not_to_be_like('other string')# same as previousexpect(1).not_to_be_like(2)expect([[1,2],[3,4]]).not_to_be_like([4,4],[2,1]])expect({'some':1,'key':2}).not_to_be_like({'key':3,'some':4})Typeexpect(os.path).to_be_a_function()expect(1).to_be_numeric()expect({'some':1,'key':2}).to_be_instance_of(dict)expect(open(__file__)).to_be_a_file()expect('some').Not.to_be_a_function()expect('some').Not.to_be_numeric()expect('some').Not.to_be_instance_of(dict)expect('some').Not.to_be_a_file()True / Falseexpect(True).to_be_true()expect('some').to_be_true()expect([1,2,3]).to_be_true()expect({'a':'b'}).to_be_true()expect(1).to_be_true()expect(False).to_be_false()# not_to_be_true() would work, too. but, it's so...ewwexpect(None).to_be_false()expect('').to_be_false()expect(0).to_be_false()expect([]).to_be_false()expect({}).to_be_false()Noneexpect(None).to_be_null()expect('some').Not.to_be_null()expect('some').not_to_be_null()# same as previousInclusionexpect([1,2,3]).to_include(2)expect((1,2,3)).to_include(2)expect('123').to_include('2')expect({'a':1,'b':2,'c':3}).to_include('b')expect([1,3]).Not.to_include(2)# or, exclusion...Regular Expressionsexpect('some').to_match(r'^[a-z]+')expect('Some').Not.to_match(r'^[a-z]+')Lengthexpect([1,2,3]).to_length(3)expect((1,2,3)).to_length(3)expect('abc').to_length(3)expect({'a':1,'b':2,'c':3}).to_length(3)expect(lifo_queue).to_length(2)expect(queue).to_length(3)expect([1]).Not.to_length(3)expect([1]).not_to_length(3)# same as previousEmptinessexpect([]).to_be_empty()expect(tuple()).to_be_empty()expect({}).to_be_empty()expect('').to_be_empty()expect([1]).not_to_be_empty()expect((1,2)).not_to_be_empty()expect({'a':1}).not_to_be_empty()expect('roses are red').not_to_be_empty()Exceptionsexpect(RuntimeError()).to_be_an_error()expect(RuntimeError()).to_be_an_error_like(RuntimeError)expect(ValueError('error')).to_have_an_error_message_of('error')expect("I'm not an error").Not.to_be_an_error()expect(ValueError()).Not.to_be_an_error_like(RuntimeError)expect(ValueError('some')).Not.to_have_an_error_message_of('error')# when expecting a method to errorerr=expect.error_to_happen(RuntimeError)# attribute to a variable so you can use the exception laterwitherr:raiseRuntimeError("something is wrong")expect(err).to_have_an_error_message_of('something is wrong')# or the shorter versionwithexpect.error_to_happen(RuntimeError,message="something is wrong"):raiseRuntimeError("something is wrong")# or if you don't care about the message:withexpect.error_to_happen(RuntimeError):raiseRuntimeError("something is wrong")# or if you need to make sure error does not happenwithexpect.error_not_to_happen(RuntimeError,message="something is wrong"):raiseRuntimeError("something is wrong")# Fails with AssertionError# or if you don't care about the message, only that the error does not happen:withexpect.error_not_to_happen(RuntimeError):raiseRuntimeError("something is wrong")# Fails with AssertionErrorFailureexpect.not_to_be_here()# raises AssertionError# raises AssertionError with error messageexpect.not_to_be_here("some error message")Chained Assertions# assertions may be chained, for brevity:expect(6).not_to_be_null().to_equal(6)# a more *sensible* example:expect(foo).not_to_be_null().to_equal(expected.get('foo'))ContributingSeeCONTRIBUTING.LicenseThe MIT License (MIT)Copyright (c) 2013 Bernardo Heynemannheynemann@gmail.comPermission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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