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Test 5112, Mercator (variant B),  v2-0_2011-06-28.

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<gie>

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operation  proj=pipeline
           step init=epsg:4284 inv
           step init=epsg:3388

tolerance 50 mm
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accept    51.0 42.0
expect    0.0 3819897.85

accept    51.0 0.0
expect    0.0 0.0

accept    57.0 0.0
expect    497112.88 0.0

accept    54.0 20.5
expect    248556.44 1724781.5

accept    67.0 -41.0
expect    1325634.35 -3709687.25

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operation  proj=pipeline
           step init=epsg:3388 inv
           step init=epsg:4284

tolerance 50 mm
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accept    0.0 3819897.85
expect    51.0 42.0

accept    0.0 0.0
expect    51.0 0.0

accept    497112.88 0.0
expect    57.0 0.0

accept    248556.44 1724781.5
expect    54.0 20.5

accept    1325634.35 -3709687.25
expect    67.0 -41.0

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operation proj=pipeline towgs84=0,0,0
          step init=epsg:4284 inv
          step init=epsg:3388

tolerance 6 mm
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accept    51.0 42.0
roundtrip 1000

accept    51.0 0.0
roundtrip 1000

accept    57.0 0.0
roundtrip 1000

accept    54.0 20.5
roundtrip 1000

accept    67.0 -41.0
roundtrip 1000

</gie>