62 lines
2.1 KiB
Kotlin
62 lines
2.1 KiB
Kotlin
package lexer
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import lexer.errors.LexingError
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import org.junit.jupiter.api.Test
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import org.junit.jupiter.api.assertThrows
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import kotlin.test.assertEquals
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/**
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* Tests for the Prolog lexer.
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*
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* These tests are based on the Prolog syntax.
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*/
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class ScanPrologParserTests {
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@Test
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fun scan_simple_atom() {
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val tokens = Lexer("atom.").scan()
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assertEquals(3, tokens.size)
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assertEquals(TokenType.ALPHANUMERIC, tokens[0].type, "Expected ALPHANUMERIC token, got ${tokens[0].type}")
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assertEquals(TokenType.DOT, tokens[1].type, "Expected DOT token, got ${tokens[1].type}")
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assertEquals(TokenType.EOF, tokens[2].type, "Expected EOF token, got ${tokens[2].type}")
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}
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@Test
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fun scan_variable() {
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val tokens = Lexer("X.").scan()
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assertEquals(3, tokens.size)
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assertEquals(TokenType.ALPHANUMERIC, tokens[0].type, "Expected ALPHANUMERIC token, got ${tokens[0].type}")
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assertEquals(TokenType.DOT, tokens[1].type, "Expected DOT token, got ${tokens[1].type}")
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assertEquals(TokenType.EOF, tokens[2].type, "Expected EOF token, got ${tokens[2].type}")
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}
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@Test
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fun scan_variable_with_number() {
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val tokens = Lexer("X1.").scan()
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assertEquals(3, tokens.size)
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assertEquals(TokenType.ALPHANUMERIC, tokens[0].type, "Expected ALPHANUMERIC token, got ${tokens[0].type}")
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assertEquals(TokenType.DOT, tokens[1].type, "Expected DOT token, got ${tokens[1].type}")
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assertEquals(TokenType.EOF, tokens[2].type, "Expected EOF token, got ${tokens[2].type}")
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}
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@Test
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fun scan_variable_with_underscore() {
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val tokens = Lexer("X_1.").scan()
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assertEquals(3, tokens.size)
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assertEquals(TokenType.ALPHANUMERIC, tokens[0].type, "Expected ALPHANUMERIC token, got ${tokens[0].type}")
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assertEquals(TokenType.DOT, tokens[1].type, "Expected DOT token, got ${tokens[1].type}")
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assertEquals(TokenType.EOF, tokens[2].type, "Expected EOF token, got ${tokens[2].type}")
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}
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@Test
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fun scan_variable_that_starts_with_a_number() {
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assertThrows<LexingError> { Lexer("1X.").scan() }
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}
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}
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