1Test2::Compare::Delta(3U)ser Contributed Perl DocumentatiToenst2::Compare::Delta(3)
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NAME

6       Test2::Compare::Delta - Representation of differences between nested
7       data structures.
8

DESCRIPTION

10       This is used by Test2::Compare. When data structures are compared a
11       delta will be returned. Deltas are a tree data structure that represent
12       all the differences between two other data structures.
13

METHODS

15   CLASS METHODS
16       $class->add_column($NAME => sub { ... })
17       $class->add_column($NAME, %PARAMS)
18           This can be used to add columns to the table that it produced when
19           a comparison fails. The first argument should always be the column
20           name, which must be unique.
21
22           The first form simply takes a coderef that produces the value that
23           should be displayed in the column for any given delta. The
24           arguments passed into the sub are the delta, and the row ID.
25
26               Test2::Compare::Delta->add_column(
27                   Foo => sub {
28                       my ($delta, $id) = @_;
29                       return $delta->... ? 'foo' : 'bar'
30                   },
31               );
32
33           The second form allows you some extra options. The 'value' key is
34           required, and must be a coderef. All other keys are optional.
35
36               Test2::Compare::Delta->add_column(
37                   'Foo',    # column name
38                   value => sub { ... },    # how to get the cell value
39                   alias       => 'FOO',    # Display name (used in table header)
40                   no_collapse => $bool,    # Show column even if it has no values?
41               );
42
43       $bool = $class->remove_column($NAME)
44           This will remove the specified column. This will return true if the
45           column existed and was removed. This will return false if the
46           column did not exist. No exceptions are thrown. If a missing column
47           is a problem then you need to check the return yourself.
48
49       $class->set_column_alias($NAME, $ALIAS)
50           This can be used to change the table header, overriding the default
51           column names with new ones.
52
53   ATTRIBUTES
54       $bool = $delta->verified
55       $delta->set_verified($bool)
56           This will be true if the delta itself matched, if the delta matched
57           then the problem is in the delta's children, not the delta itself.
58
59       $aref = $delta->id
60       $delta->set_id([$type, $name])
61           ID for the delta, used to produce the path into the data structure.
62           An example is "['HASH' => 'foo']" which means the delta is in the
63           path "...->{'foo'}". Valid types are "HASH", "ARRAY", "SCALAR",
64           "META", and "METHOD".
65
66       $val = $delta->got
67       $delta->set_got($val)
68           Deltas are produced by comparing a received data structure 'got'
69           against a check data structure 'check'. The 'got' attribute
70           contains the value that was received for comparison.
71
72       $check = $delta->chk
73       $check = $delta->check
74       $delta->set_chk($check)
75       $delta->set_check($check)
76           Deltas are produced by comparing a received data structure 'got'
77           against a check data structure 'check'. The 'check' attribute
78           contains the value that was expected in the comparison.
79
80           "check" and "chk" are aliases for the same attribute.
81
82       $aref = $delta->children
83       $delta->set_children([$delta1, $delta2, ...])
84           A Delta may have child deltas. If it does then this is an arrayref
85           with those children.
86
87       $dne = $delta->dne
88       $delta->set_dne($dne)
89           Sometimes a comparison results in one side or the other not
90           existing at all, in which case this is set to the name of the
91           attribute that does not exist. This can be set to 'got' or 'check'.
92
93       $e = $delta->exception
94       $delta->set_exception($e)
95           This will be set to the exception in cases where the comparison
96           failed due to an exception being thrown.
97
98   OTHER
99       $string = $delta->render_got
100           Renders the string that should be used in a table to represent the
101           received value in a comparison.
102
103       $string = $delta->render_check
104           Renders the string that should be used in a table to represent the
105           expected value in a comparison.
106
107       $bool = $delta->should_show
108           This will return true if the delta should be shown in the table.
109           This is normally true for any unverified delta. This will also be
110           true for deltas that contain extra useful debug information.
111
112       $aref = $delta->filter_visible
113           This will produce an arrayref of "[ $path => $delta ]" for all
114           deltas that should be displayed in the table.
115
116       $aref = $delta->table_header
117           This returns an array ref of the headers for the table.
118
119       $string = $delta->table_op
120           This returns the operator that should be shown in the table.
121
122       $string = $delta->table_check_lines
123           This returns the defined lines (extra debug info) that should be
124           displayed.
125
126       $string = $delta->table_got_lines
127           This returns the generated lines (extra debug info) that should be
128           displayed.
129
130       $aref = $delta->table_rows
131           This returns an arrayref of table rows, each row is itself an
132           arrayref.
133
134       @table_lines = $delta->table
135           Returns all the lines of the table that should be displayed.
136

SOURCE

138       The source code repository for Test2-Suite can be found at
139       https://github.com/Test-More/Test2-Suite/.
140

MAINTAINERS

142       Chad Granum <exodist@cpan.org>
143

AUTHORS

145       Chad Granum <exodist@cpan.org>
146
148       Copyright 2018 Chad Granum <exodist@cpan.org>.
149
150       This program is free software; you can redistribute it and/or modify it
151       under the same terms as Perl itself.
152
153       See http://dev.perl.org/licenses/
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157perl v5.36.0                      2022-07-22          Test2::Compare::Delta(3)
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