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1 changed files with 81 additions and 23 deletions
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@ -789,7 +789,54 @@ module Spectator::DSL
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# The name can be used in examples to retrieve the value (basically a method).
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# This can be used to define a value once and reuse it in multiple examples.
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#
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# This macro expects a name and a block.
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# There are two variants - assignment and block.
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# Both must be given a name.
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#
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# For the assignment variant:
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# ```
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# let string = "foobar"
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#
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# it "isn't empty" do
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# expect(string.empty?).to be_false
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# end
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#
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# it "is six characters" do
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# expect(string.size).to eq(6)
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# end
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# ```
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#
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# The value is evaluated and stored immediately.
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# This is different from other `#let` variants that lazily-evaluate.
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#
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# ```
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# let current_time = Time.utc
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# let(lazy_time) { Time.utc }
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#
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# it "lazy evaluates" do
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# now = current_time
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# sleep 5
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# expect(lazy_time).to_not eq(now)
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# end
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# ```
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#
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# However, the value is not reused across tests.
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# It will be reconstructed when the next test starts.
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#
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# ```
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# let array = [0, 1, 2]
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#
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# it "modifies the array" do
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# array[0] = 42
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# expect(array).to eq([42, 1, 2])
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# end
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#
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# it "doesn't carry across tests" do
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# array[1] = 777
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# expect(array).to eq([0, 777, 2])
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# end
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# ```
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#
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# The block variant expects a name and a block.
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# The name can be a symbol or a literal - same as `Object#getter`.
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# The block should return the value.
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#
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@ -838,6 +885,16 @@ module Spectator::DSL
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# end
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# ```
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macro let(name, &block)
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{% if block.is_a?(Nop) %}
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# Assignment variant.
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@%value = {{name.value}}
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def {{name.target}}
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@%value
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end
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{% else %}
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# Block variant.
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# Create a block that returns the value.
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let!(%value) {{block}}
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@ -864,6 +921,7 @@ module Spectator::DSL
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end
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end
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end
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{% end %}
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end
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# The noisier sibling to `#let`.
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