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parsing_test.md: mention LexerTestCase (IJSDK-990)

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Yann Cébron 2021-02-23 17:27:06 +01:00
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topics/tutorials/writing_tests_for_plugins/parsing_test.md
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<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
The first test checks if the Simple Language parser, implemented in the [Lexer and Parser Definition](lexer_and_parser_definition.md) section of the Custom Language Support Tutorial, works as expected.
For more complex Lexers (e.g., having additional logic), it is advisable to add separate tests inheriting from [`LexerTestCase`](upsource:///platform/testFramework/src/com/intellij/testFramework/LexerTestCase.java).
## Update Grammar and Regenerate the Parser
Before creating the parsing test, ensure the parser definition (`Simple.bnf`) includes the lines shown below.