expected = "replacement worked replacement worked";
actual = interpolator.interpolate( "{foo} {foo}", context );
assertEquals( actual, expected, "Wrong substitution" );
expected = "This replacement worked just fine";
actual = interpolator.interpolate( "This {foo} just fine", context );
assertEquals( actual, expected, "Wrong substitution" );
expected = "{} replacement worked {unkown}";
actual = interpolator.interpolate( "{} {foo} {unkown}", context );
assertEquals( actual, expected, "Wrong substitution" );