我在rspec中编写我的第一个自定义匹配器。我想提供一个失败消息,分析比较失败的原因。实际上我想输出预期对象和实际对象之间的差异。我实际上只需要在对象上使用2个数组。我做了一些研究,并尝试使用=〜所描述的here。它提到它有一个信息性的失败消息,但我正在努力访问失败消息。我实际上只想返回两个单独数组的组合失败消息,以便为匹配器返回false提供信息性原因。
我的尝试如下
RSpec::Matchers.define :have_same_state_as_measure_table do |expected_measure_table , max_delta = 1e-06|
match do |actual_measure_table|
actual_measure_table.equivalence(expected_measure_table, max_delta)
end
description do
"checks if measure has same state as expected measure table within a given number of precision"
end
# Optional method description
description do
"checks if measure has same state as expected measure table, within a given level of precision"
end
# Optional failure messages
failure_message do |actual_measure_table|
mismatch_string = ""
mismatch_string += (actual_measure_table.columns =~ expected_measure_table.columns || "")
mismatch_string += (actual_measure_table.names =~ expected_measure_table.names || "")
"Measure tables missmatch as follows %s" % (mismatch_string.to_s)
end
failure_message_when_negated do |actual_measure_table|
"expected friend not to be in zipcode"
end
end
答案 0 :(得分:0)
我的最终匹配者如下:
class CompareMeasureTables
attr_reader :expected_measure_table, :max_delta, :actual_measure_table
def initialize(expected_measure_table, max_delta=1e-06)
@expected_measure_table = expected_measure_table
@max_delta = max_delta
end
def description
"Checks if measure has same state as expected measure table, within a given level of precision"
end
def matches?(actual_measure_table)
@actual_measure_table = actual_measure_table
actual_measure_table.equivalence(expected_measure_table, max_delta, false)
end
def failure_message
@mismatch_description = ""
if actual_measure_table.columns.sort != expected_measure_table.columns.sort
@mismatch_description += "\nColumns mismatch \nExpected =" + expected_measure_table.columns.inspect
@mismatch_description += "\nActual =" + actual_measure_table.columns.inspect
end
if (@mismatch_description == "")
@mismatch_description += "\nData mismatch \nExpected =" + (expected_measure_table.records - actual_measure_table.records).inspect
@mismatch_description += "\nActual =" + (actual_measure_table.records - expected_measure_table.records).inspect
@mismatch_description += "\nTolerance set at #{@max_delta}"
end
"Measure tables mismatch as follows %s" % (@mismatch_description)
end
end