test: cover StaticCacheTest, test_weak_validators_are_size_and_mtime

test/test_streaming_body.rb

@@ -0,0 +1,52 @@
+require 'minitest/autorun'
+require 'prism'
+
+class StreamingBodyTest < Minitest::Test
+  def test_each_yields_chunks_in_write_order
+    body = Prism::StreamingBody.new do |out|
+      out.write('a')
+      out.write('b')
+      out << 'c'
+    end
+
+    collected = []
+    body.each { |chunk| collected << chunk }
+    assert_equal %w[a b c], collected
+  end
+
+  def test_write_coerces_non_string_chunks_to_string
+    body = Prism::StreamingBody.new { |out| out.write(42) }
+
+    collected = []
+    body.each { |chunk| collected << chunk }
+    assert_equal ['42'], collected
+    assert collected.first.is_a?(String)
+  end
+
+  # The producer block must not run just because a StreamingBody was
+  # created - only #each (whatever eventually sends the response) triggers
+  # it, exactly like an ordinary Array body is not "used" until iterated.
+  def test_producer_block_does_not_run_until_each_is_called
+    ran = false
+    body = Prism::StreamingBody.new { ran = true }
+    refute ran
+    body.each { |_chunk| nil }
+    assert ran
+  end
+
+  def test_each_can_be_called_more_than_once_and_reruns_the_producer
+    calls = 0
+    body = Prism::StreamingBody.new do |out|
+      calls += 1
+      out.write("call-#{calls}")
+    end
+
+    first = []
+    body.each { |chunk| first << chunk }
+    second = []
+    body.each { |chunk| second << chunk }
+
+    assert_equal ['call-1'], first
+    assert_equal ['call-2'], second
+  end
+end