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RSpec.describe "expect(...).to satisfy { block }" do
it_behaves_like "an RSpec matcher", :valid_value => true, :invalid_value => false do
let(:matcher) { satisfy { |v| v } }
end
it "describes itself" do
expect(satisfy.description).to eq("satisfy block")
end
it "passes if block returns true" do
expect(true).to satisfy { |val| val }
expect(true).to satisfy do |val|
val
end
end
it "fails if block returns false" do
expect {
expect(false).to satisfy { |val| val }
}.to fail_with("expected false to satisfy block")
expect do
expect(false).to satisfy do |val|
val
end
end.to fail_with("expected false to satisfy block")
end
context "when a custom description is provided" do
it "describes itself" do
expect(satisfy("be awesome").description).to eq("be awesome")
end
it "passes if block returns true" do
expect(true).to satisfy("be true") { |val| val }
expect(true).to satisfy("be true") do |val|
val
end
end
it "fails with the custom description if block returns false" do
expect {
expect(false).to satisfy("be true") { |val| val }
}.to fail_with("expected false to be true")
expect do
expect(false).to satisfy("be true") do |val|
val
end
end.to fail_with("expected false to be true")
end
end
end
RSpec.describe "expect(...).not_to satisfy { block }" do
it "passes if block returns false" do
expect(false).not_to satisfy { |val| val }
expect(false).not_to satisfy do |val|
val
end
end
it "fails if block returns true" do
expect {
expect(true).not_to satisfy { |val| val }
}.to fail_with("expected true not to satisfy block")
end
context "when a custom description is provided" do
it "passes if block returns false" do
expect(false).not_to satisfy("be true") { |val| val }
expect(false).not_to satisfy("be true") do |val|
val
end
end
it "fails with the custom description if block returns true" do
expect {
expect(true).not_to satisfy("be true") { |val| val }
}.to fail_with("expected true not to be true")
end
end
end
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