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InfixToPostfixTest.java
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InfixToPostfixTest.java
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package com.thealgorithms.stacks;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
class InfixToPostfixTest {
@ParameterizedTest
@MethodSource("provideValidExpressions")
void testValidExpressions(String infix, String expectedPostfix) throws Exception {
assertEquals(expectedPostfix, InfixToPostfix.infix2PostFix(infix));
}
private static Stream<Arguments> provideValidExpressions() {
return Stream.of(Arguments.of("3+2", "32+"), Arguments.of("1+(2+3)", "123++"), Arguments.of("(3+4)*5-6", "34+5*6-"));
}
@ParameterizedTest
@MethodSource("provideInvalidExpressions")
void testInvalidExpressions(String infix, String expectedMessage) {
Exception exception = assertThrows(Exception.class, () -> InfixToPostfix.infix2PostFix(infix));
assertEquals(expectedMessage, exception.getMessage());
}
private static Stream<Arguments> provideInvalidExpressions() {
return Stream.of(Arguments.of("((a+b)*c-d", "invalid expression"));
}
}