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RSpec.describe "expect(...).to start_with" do
it_behaves_like "an RSpec value matcher", :valid_value => "ab", :invalid_value => "bc" do
let(:matcher) { start_with("a") }
end
context "with a string" do
it "passes if it matches the start of the actual string" do
expect("this string").to start_with "this str"
end
it "fails if it does not match the start of the actual string" do
expect {
expect("this string").to start_with "that str"
}.to fail_with("expected \"this string\" to start with \"that str\"")
end
end
context "with an array" do
it "passes if it is the first element of the array" do
expect([0, 1, 2]).to start_with 0
end
it "passes if the first elements of the array match" do
expect([0, 1, 2]).to start_with 0, 1
end
it "fails if it does not match the first element of the array" do
expect {
expect([0, 1, 2]).to start_with 2
}.to fail_with("expected [0, 1, 2] to start with 2")
end
it "fails if it the first elements of the array do not match" do
expect {
expect([0, 1, 2]).to start_with 1, 2
}.to fail_with("expected [0, 1, 2] to start with 1 and 2")
end
end
context "with an array of strings" do
it "passes if given the first element of the array" do
expect(%w[ a b c ]).to start_with 'a'
end
it "passes if given the first n of the array" do
expect(%w[ a b c ]).to start_with('a', 'b')
end
it 'fails if given the wrong first element of the array' do
expect {
expect(%w[ a b c ]).to start_with 'z'
}.to fail_with('expected ["a", "b", "c"] to start with "z"')
end
end
context "with an array of uncustomized structs" do
struct = Struct.new(:foo)
it 'passes if the array ends with a struct equal to the provided struct' do
s1 = struct.new(5)
s2 = struct.new(5)
expect(s1).to eq(s2)
expect([s1, 10]).to start_with(s2)
end
it 'fails if the array ends with a struct not equal to the provided struct' do
s1 = struct.new(5)
s2 = struct.new(6)
expect(s1).not_to eq(s2)
expect {
expect([s1, 10]).to start_with(s2)
}.to fail_including("expected [#{s1.inspect}, 10] to start with #{s2.inspect}")
end
end
context "with an array of structs that have a custom `==` definition" do
my_struct = Struct.new(:id, :fluff) do
def ==(other)
other.is_a?(self.class) && other.id == id
end
end
it 'passes if the array ends with a struct equal to the provided struct' do
s1 = my_struct.new(1, "foo")
s2 = my_struct.new(1, "bar")
expect(s1).to eq(s2)
expect([s1, 10]).to start_with(s2)
end
it 'fails if the array ends with a struct not equal to the provided struct' do
s1 = my_struct.new(1, "foo")
s2 = my_struct.new(2, "bar")
expect(s1).not_to eq(s2)
expect {
expect([s1, 10]).to start_with(s2)
}.to fail_including("expected [#{s1.inspect}, 10] to start with #{s2.inspect}")
end
end
context "with an object that does not respond to :[]" do
it "fails with a useful message" do
actual = Object.new
expect {
expect(actual).to start_with 0
}.to fail_with("expected #{actual.inspect} to start with 0, but it cannot be indexed using #[]")
end
end
context "with a hash" do
it "fails with a useful error if trying to match more than one element" do
actual = { :a => 'b', :b => 'b', :c => 'c' }
expected = { :a => 'b', :b => 'b' }
expect {
expect(actual).to start_with(expected)
}.to fail_with(/\Aexpected #{hash_inspect(actual).gsub(" => ", "=>")} to start with #{hash_inspect(expected).gsub(" => ", "=>")}, but it does not have ordered elements\z/)
end
end
describe "composing with other matchers" do
it 'passes if the start of an array matches two given matchers' do
expect([1.01, "food", 3]).to start_with(a_value_within(0.2).of(1), a_string_matching(/foo/))
end
it 'passes if the start of an array matches one given matcher' do
expect([1.01, "food", 3]).to start_with(a_value_within(0.2).of(1))
end
it 'provides a description' do
description = start_with(a_value_within(0.1).of(1), a_string_matching(/abc/)).description
expect(description).to eq("start with a value within 0.1 of 1 and a string matching /abc/")
end
it 'fails with a clear error message when the matchers do not match' do
expect {
expect([2.01, "food", 3]).to start_with(a_value_within(0.2).of(1), a_string_matching(/foo/))
}.to fail_with('expected [2.01, "food", 3] to start with a value within 0.2 of 1 and a string matching /foo/')
end
end
end
RSpec.describe "expect(...).not_to start_with" do
context "with a string" do
it "passes if it does not match the start of the actual string" do
expect("this string").not_to start_with "that str"
end
it "fails if it does match the start of the actual string" do
expect {
expect("this string").not_to start_with "this str"
}.to fail_with("expected \"this string\" not to start with \"this str\"")
end
end
context "with an array" do
it "passes if it is not the first element of the array" do
expect([0, 1, 2]).not_to start_with 2
end
it "passes if the first elements of the array do not match" do
expect([0, 1, 2]).not_to start_with 1, 2
end
it "fails if it matches the first element of the array" do
expect {
expect([0, 1, 2]).not_to start_with 0
}.to fail_with("expected [0, 1, 2] not to start with 0")
end
it "fails if it the first elements of the array match" do
expect {
expect([0, 1, 2]).not_to start_with 0, 1
}.to fail_with("expected [0, 1, 2] not to start with 0 and 1")
end
end
context "with an array of strings" do
it "fails if given the first element of the array" do
expect {
expect(%w[ a b c ]).not_to start_with 'a'
}.to fail_with('expected ["a", "b", "c"] not to start with "a"')
end
it "fails if given the first n of the array" do
expect {
expect(%w[ a b c ]).not_to start_with('a', 'b')
}.to fail_with('expected ["a", "b", "c"] not to start with "a" and "b"')
end
it 'passes if given the wrong first element of the array' do
expect(%w[ a b c ]).not_to start_with 'z'
end
end
it 'can pass when composed with another matcher' do
expect(["a"]).not_to start_with(a_string_matching(/bar/))
end
it 'can fail when composed with another matcher' do
expect {
expect(["a"]).not_to start_with(a_string_matching(/a/))
}.to fail_with('expected ["a"] not to start with a string matching /a/')
end
end
RSpec.describe "expect(...).to end_with" do
it_behaves_like "an RSpec value matcher", :valid_value => "ab", :invalid_value => "bc" do
let(:matcher) { end_with("b") }
end
context "with a string" do
it "passes if it matches the end of the actual string" do
expect("this string").to end_with "is string"
end
it "fails if it does not match the end of the actual string" do
expect {
expect("this string").to end_with "is stringy"
}.to fail_with("expected \"this string\" to end with \"is stringy\"")
end
end
context "with an array" do
it "passes if it is the last element of the array" do
expect([0, 1, 2]).to end_with 2
end
it "passes if the last elements of the array match" do
expect([0, 1, 2]).to end_with [1, 2]
end
it "fails if it does not match the last element of the array" do
expect {
expect([0, 1, 2]).to end_with 1
}.to fail_with("expected [0, 1, 2] to end with 1")
end
it "fails if it the last elements of the array do not match" do
expect {
expect([0, 1, 2]).to end_with [0, 1]
}.to fail_with("expected [0, 1, 2] to end with 0 and 1")
end
end
context "with an array of strings" do
it "passes if given the last element of the array" do
expect(%w[ a b c ]).to end_with 'c'
end
it "passes if given the last n of the array" do
expect(%w[ a b c ]).to end_with('b', 'c')
end
it 'fails if given the wrong last element of the array' do
expect {
expect(%w[ a b c ]).to end_with 'z'
}.to fail_with('expected ["a", "b", "c"] to end with "z"')
end
end
context "with an array of uncustomized structs" do
struct = Struct.new(:foo)
it 'passes if the array ends with a struct equal to the provided struct' do
s1 = struct.new(5)
s2 = struct.new(5)
expect(s1).to eq(s2)
expect([10, s1]).to end_with(s2)
end
it 'fails if the array ends with a struct not equal to the provided struct' do
s1 = struct.new(5)
s2 = struct.new(6)
expect(s1).not_to eq(s2)
expect {
expect([10, s1]).to end_with(s2)
}.to fail_including("expected [10, #{s1.inspect}] to end with #{s2.inspect}")
end
end
context "with an array of structs that have a custom `==` definition" do
my_struct = Struct.new(:id, :fluff) do
def ==(other)
other.is_a?(self.class) && other.id == id
end
end
it 'passes if the array ends with a struct equal to the provided struct' do
s1 = my_struct.new(1, "foo")
s2 = my_struct.new(1, "bar")
expect(s1).to eq(s2)
expect([10, s1]).to end_with(s2)
end
it 'fails if the array ends with a struct not equal to the provided struct' do
s1 = my_struct.new(1, "foo")
s2 = my_struct.new(2, "bar")
expect(s1).not_to eq(s2)
expect {
expect([10, s1]).to end_with(s2)
}.to fail_including("expected [10, #{s1.inspect}] to end with #{s2.inspect}")
end
end
context "with an object that does not respond to :[]" do
it "fails with a useful message" do
actual = Object.new
expect {
expect(actual).to end_with 0
}.to fail_with("expected #{actual.inspect} to end with 0, but it cannot be indexed using #[]")
end
end
context "with a hash" do
it "raises an ArgumentError if trying to match more than one element" do
actual = { :a => 'b', :b => 'b', :c => 'c' }
expected = { :a => 'b', :b => 'b' }
expect {
expect(actual).to end_with(expected)
}.to fail_with(/\Aexpected #{hash_inspect(actual).gsub(" => ", "=>")} to end with #{hash_inspect(expected).gsub(" => ", "=>")}, but it does not have ordered elements\z/)
end
end
describe "composing with other matchers" do
it 'passes if the end of an array matches two given matchers' do
expect([3, "food", 1.1]).to end_with(a_string_matching(/foo/), a_value_within(0.2).of(1))
end
it 'passes if the end of an array matches one given matcher' do
expect([3, "food", 1.1]).to end_with(a_value_within(0.2).of(1))
end
it 'provides a description' do
description = end_with(a_value_within(0.1).of(1), a_string_matching(/abc/)).description
expect(description).to eq("end with a value within 0.1 of 1 and a string matching /abc/")
end
it 'fails with a clear error message when the matchers do not match' do
expect {
expect([2.01, 3, "food"]).to end_with(a_value_within(0.2).of(1), a_string_matching(/foo/))
}.to fail_with('expected [2.01, 3, "food"] to end with a value within 0.2 of 1 and a string matching /foo/')
end
end
end
RSpec.describe "expect(...).not_to end_with" do
context "with a sting" do
it "passes if it does not match the end of the actual string" do
expect("this string").not_to end_with "stringy"
end
it "fails if it matches the end of the actual string" do
expect {
expect("this string").not_to end_with "string"
}.to fail_with("expected \"this string\" not to end with \"string\"")
end
end
context "an array" do
it "passes if it is not the last element of the array" do
expect([0, 1, 2]).not_to end_with 1
end
it "passes if the last elements of the array do not match" do
expect([0, 1, 2]).not_to end_with [0, 1]
end
it "fails if it matches the last element of the array" do
expect {
expect([0, 1, 2]).not_to end_with 2
}.to fail_with("expected [0, 1, 2] not to end with 2")
end
it "fails if it the last elements of the array match" do
expect {
expect([0, 1, 2]).not_to end_with [1, 2]
}.to fail_with("expected [0, 1, 2] not to end with 1 and 2")
end
end
context "with an array of strings" do
it "fails if given the last element of the array" do
expect {
expect(%w[ a b c ]).not_to end_with 'c'
}.to fail_with('expected ["a", "b", "c"] not to end with "c"')
end
it "fails if given the last n of the array" do
expect {
expect(%w[ a b c ]).not_to end_with('b', 'c')
}.to fail_with('expected ["a", "b", "c"] not to end with "b" and "c"')
end
it 'passes if given the wrong last element of the array' do
expect(%w[ a b c ]).not_to end_with 'z'
end
end
it 'can pass when composed with another matcher' do
expect(["a"]).not_to end_with(a_string_matching(/bar/))
end
it 'can fail when composed with another matcher' do
expect {
expect(["a"]).not_to end_with(a_string_matching(/a/))
}.to fail_with('expected ["a"] not to end with a string matching /a/')
end
end
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