inherit.test

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#
# Tests for inheritance and scope handling
# ----------------------------------------------------------------------
#   AUTHOR:  Michael J. McLennan
#            Bell Labs Innovations for Lucent Technologies
#            [e-mail]
#            http://www.tcltk.com/itcl
#
#      RCS:  $Id: inherit.test 144 2003-02-05 10:56:26Z mdejong $
# ----------------------------------------------------------------------
#            Copyright (c) 1993-1998  Lucent Technologies, Inc.
# ======================================================================
# See the file "license.terms" for information on usage and
# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.

# ----------------------------------------------------------------------
#  MULTIPLE BASE-CLASS ERROR DETECTION
# ----------------------------------------------------------------------
test {Cannot inherit from the same base class more than once} {
	catch "VirtualErr" errmsg
	set errmsg
} {
	[string match {*class "::VirtualErr" inherits base class "::Foo" more than once:
  VirtualErr->Mongrel->FooBar->Foo
  VirtualErr->Foo
  VirtualErr->BarFoo->Foo} $result]
}

# ----------------------------------------------------------------------
#  CONSTRUCTION
# ----------------------------------------------------------------------
test {Constructors should be invoked implicitly} {
	set WATCH ""
	concat [Mongrel m] / $WATCH
} {
	$result == "m / ::Geek ::Bar ::Foo ::FooBar ::Mongrel"
}

test {Initialization of shadowed variables works properly} {
	concat [m info public blit -value] / [m info public Foo::blit -value]
} {
	$result == "nonnull / <undefined>"
}

# ----------------------------------------------------------------------
#  PUBLIC VARIABLES
# ----------------------------------------------------------------------
test {Inherited "config" method works on derived classes} {
	m config -blit xyz -Foo::blit pdq
} {
	$result == "Mongrel::blit Foo::blit"
}

test {Inherited "config" method works on derived classes} {
	m config -blit xyz -Foo::blit pdq
	concat [m info public blit -value] / [m info public Foo::blit -value]
} {
	$result == "xyz / pdq"
}

test {Inherited "config" method works on derived classes} {
	m config -tag #0000
} {
	$result == "Mongrel::tag"
}

# ----------------------------------------------------------------------
#  INHERITANCE INFO
# ----------------------------------------------------------------------
test {Info: class} {
	m info class
} {
	$result == "::Mongrel"
}

test {Info: inherit} {
	m info inherit
} {
	$result == "::FooBar ::Geek"
}

test {Info: heritage} {
	m info heritage
} {
	$result == "::Mongrel ::FooBar ::Foo ::Bar ::Geek"
}

test {Built-in "isa" method} {
	set status 1
	foreach c [m info heritage] {
		set status [expr {$status && [m isa $c]}]
	}
	set status
} {
	$result == 1
}

test {Built-in "isa" method} {
    itcl_class Watermelon {}
	m isa Watermelon
} {
	$result == 0
}

# ----------------------------------------------------------------------
#  SCOPE MANIPULATION
# ----------------------------------------------------------------------
test {commands normally execute in the scope of their class} {
	m Foo::do {namespace current}
} {
	$result == "Foo says '::Foo'"
}

test {"virtual" command moves scope to most specific class} {
	m Foo::do {virtual namespace current}
} {
	$result == "Foo says '::Mongrel'"
}

test {"previous" command moves scope upward in hierarchy} {
	m do {virtual previous namespace current}
} {
	$result == "Foo says '::FooBar'"
}

test {"previous" command can be chained} {
	m do {virtual previous previous namespace current}
} {
	$result == "Foo says '::Foo'"
}

# ----------------------------------------------------------------------
#  METHOD INVOCATION
# ----------------------------------------------------------------------
test {Simple method names are assigned based on heritage} {
	m do {concat "$this ([virtual info class]) at scope [namespace current]"}
} {
	$result == "Foo says '::m (Mongrel) at scope ::Foo'"
}

test {Explicit scoping can be used to reach shadowed members} {
	m Geek::do {concat "$this ([virtual info class]) at scope [namespace current]"}
} {
	$result == "Geek says '::m (Mongrel) at scope ::Geek'"
}

test {Methods execute in local scope of class, e.g., Foo::do} {
	m config -blit abc -Foo::blit def
	m Foo::do {set blit xyz}
	concat [m info public blit -value] / [m info public Foo::blit -value]
} {
	$result == "abc / xyz"
}

# ----------------------------------------------------------------------
#  DESTRUCTION
# ----------------------------------------------------------------------
test {Destructors should be invoked implicitly} {
	set WATCH ""
	concat [m delete] / $WATCH
} {
	$result == "/ ::Mongrel ::FooBar ::Foo ::Bar ::Geek"
}

# ----------------------------------------------------------------------
#  OBJECT INFO
# ----------------------------------------------------------------------
foreach obj [itcl_info objects] {
	$obj delete
}
Mongrel m
FooBar fb
Foo f
Geek g

test {Object queries can be restricted by object name} {
	itcl_info objects f*
} {
	[test_cmp_lists $result {f fb}]
}

test {Object queries can be restricted to specific classes} {
	itcl_info objects -class Foo
} {
	$result == "f"
}

test {Object queries can be restricted by object heritage} {
	itcl_info objects -isa Foo
} {
	[test_cmp_lists $result {m f fb}]
}

test {Object queries can be restricted by object name / specific classes} {
	itcl_info objects f* -class Foo
} {
	$result == "f"
}

test {Object queries can be restricted by object name / object heritage} {
	itcl_info objects f* -isa Foo
} {
	[test_cmp_lists $result {f fb}]
}

# ----------------------------------------------------------------------
#  ERROR HANDLING ACROSS CLASS BOUNDARIES
# ----------------------------------------------------------------------
Mongrel m1
FooBar fb2

test {Errors and detected and reported across class boundaries} {
	set status [catch {m1 do {fb2 do {error "test"}}} mesg]
	format "$mesg $status"
} {
	$result == "test 1"
}

test {Stack trace unwinds properly across class boundaries} {
	catch {m1 do {fb2 do {error "test"}}} mesg
	format "$errorInfo"
} {
	$result == {test
    while executing
"error "test""
    ("eval" body line 1)
    invoked from within
"eval $cmds"
    invoked from within
"return "Foo says '[eval $cmds]..."
    (object "::fb2" method "::Foo::do" body line 2)
    invoked from within
"fb2 do {error "test"}"
    ("eval" body line 1)
    invoked from within
"eval $cmds"
    invoked from within
"return "Foo says '[eval $cmds]..."
    (object "::m1" method "::Foo::do" body line 2)
    invoked from within
"m1 do {fb2 do {error "test"}}"}
}

test {Stack trace unwinds properly across class boundaries} {
	catch {m1 do {fb2 do {error "test" "some error"}}} mesg
	format "$errorInfo"
} {
	$result == {some error
    ("eval" body line 1)
    invoked from within
"eval $cmds"
    invoked from within
"return "Foo says '[eval $cmds]..."
    (object "::fb2" method "::Foo::do" body line 2)
    invoked from within
"fb2 do {error "test" "some error"}"
    ("eval" body line 1)
    invoked from within
"eval $cmds"
    invoked from within
"return "Foo says '[eval $cmds]..."
    (object "::m1" method "::Foo::do" body line 2)
    invoked from within
"m1 do {fb2 do {error "test" "some error"}}"}
}

test {Error codes are preserved across class boundaries} {
	catch {m1 do {fb2 do {error "test" "some error" CODE-BLUE}}} mesg
	format "$errorCode"
} {
	$result == "CODE-BLUE"
}