Give me your opinions:

some_rspec.rb

# Explicit contexts
describe ".some_method?" do
  context "when <condition is met>" do
    it "should be true" do
      @foo.condition = "met"
      @foo.should be_some_method
    end
  end

  context "when <condition is not met>" do
    it "should be false" do
      @foo.conditions = "not met"
      @foo.should_not be_some_method
    end
  end
end

# Implicit contexts
describe ".some_method?" do
  it "should be true when <condition is met>" do
    @foo.conditions = "met"
    @foo.should be_some_method
  end

  it "shoulbd be false when <condition is not met>" do
    @foo.conditions = "not met"
    @foo.should_not be_some_method
  end
end

I tend to type out the contexts explicitly, but it seems heavy handed for these single test contexts.