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ExpressionTest.java
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ExpressionTest.java
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package
me.despawningbone.arithtrain
;
import static
org.junit.Assert.*
;
import
java.util.Arrays
;
import
java.util.List
;
import
org.junit.Test
;
public
class
ExpressionTest
{
@Test
public
void
testEvaluation
()
{
//will not test stepEval since it is vulnerable by design and needs evaluateWithSteps as a linter
//normal cases
assertEquals
(
String
.
valueOf
(
4.0
),
ExpressionGenerator
.
evaluateWithSteps
(
"2+2"
).
get
(
1
));
//normal operation
assertEquals
(
String
.
valueOf
(
2.5
),
ExpressionGenerator
.
evaluateWithSteps
(
"2+2/4"
).
get
(
2
));
//priority
assertEquals
(
String
.
valueOf
(
1
-(
2
-
3
/(
4
+
5d
))-
2
),
ExpressionGenerator
.
evaluateWithSteps
(
"1-(2-3/(4+5))-2"
).
get
(
5
));
//parentheses
assertEquals
(
String
.
valueOf
(
2.0E7
),
ExpressionGenerator
.
evaluateWithSteps
(
"1E10 / 500"
).
get
(
1
));
//E notation
assertEquals
(
Arrays
.
asList
(
"5/(4%8)+8-34+43*2"
,
"5/4.0+8-34+43*2"
,
"1.25+8-34+43*2"
,
"1.25+8-34+86.0"
,
"9.25-34+86.0"
,
"-24.75+86.0"
,
"61.25"
),
ExpressionGenerator
.
evaluateWithSteps
(
"5/(4%8)+8-34+43*2"
));
//steps
//edge cases
assertEquals
(
String
.
valueOf
(
0.0
),
ExpressionGenerator
.
evaluateWithSteps
(
"1 / 1E1000"
).
get
(
1
));
assertEquals
(
String
.
valueOf
(
23.0
),
ExpressionGenerator
.
evaluateWithSteps
(
"4 0+++2 8*- 1 1 % -1 2+-++-+--- 8 +- 1 "
).
get
(
5
));
//space placements + positive/negative indicators
assertEquals
(
String
.
valueOf
(
210.0
),
ExpressionGenerator
.
evaluateWithSteps
(
"7(((((5))))6)"
).
get
(
2
));
//redundant parentheses
assertEquals
(
Arrays
.
asList
(
""
),
ExpressionGenerator
.
evaluateWithSteps
(
""
));
//empty string
assertEquals
(
String
.
valueOf
(-
2323628.56
),
ExpressionGenerator
.
evaluateWithSteps
(
"2374*-982+19005-11396+3044E-2"
).
get
(
4
));
//negative E notation
//invalid cases
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"32-(432+13/3/2"
));
//imbalanced parentheses
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"!3a9-(231)-439-3"
));
//invalid characters
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"\\39-(231)-439-3"
));
//invalid characters
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"(1-1)%0"
));
//division by zero
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"1/0"
));
//division by zero
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
"1E100 * 1E1000 - 1"
));
//infinity
testEvaluationThrows
(()
->
ExpressionGenerator
.
evaluateWithSteps
(
null
));
//null
}
private
void
testEvaluationThrows
(
Runnable
run
)
{
try
{
run
.
run
();
}
catch
(
IllegalArgumentException
e
)
{
return
;
}
fail
();
}
@Test
public
void
testGenerator
()
{
Main
.
initOperators
();
//need to manually invoke this since main class initConfig() is not invoked in test cases
ExpressionGenerator
exp1
=
new
ExpressionGenerator
(
19
,
5
,
-
1000
,
19343
);
//normal cases
ExpressionGenerator
exp2
=
new
ExpressionGenerator
(
10
,
3
,
0
,
1000
);
assertEquals
(
true
,
exp1
.
isHarder
(
exp2
));
assertEquals
(
"ExpGen{bracket=19,opCount=5,range=-1000-19343}"
,
exp1
.
toString
());
String
exp
=
exp1
.
generate
().
get
(
0
);
assertTrue
(
exp
.
length
()
-
exp
.
replaceAll
(
"(?<=[0-9)])[+\\-*/%]"
,
""
).
length
()
==
5
);
//check how many actual operators are there, excluding negative indicators ("-"s not preceding numbers or parentheses, i.e. "+-" etc)
//volume test
for
(
int
i
=
0
;
i
<
10000
;
i
++)
{
List
<
String
>
gen
=
exp1
.
generate
();
assertTrue
(
ExpressionGenerator
.
evaluateWithSteps
(
gen
.
get
(
0
)).
indexOf
(
gen
.
get
(
gen
.
size
()
-
1
))
!=
-
1
);
}
}
}
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