124 lines
3.6 KiB
Java
124 lines
3.6 KiB
Java
package scanner;
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import static org.junit.Assert.assertEquals;
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import java.io.IOException;
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import java.io.InputStream;
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import org.junit.Before;
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import org.junit.Test;
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import testutils.TestUtilities;
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public class LispFilterInputStreamTester {
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private StringBuilder charactersRead;
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@Before
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public void setUp() {
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charactersRead = new StringBuilder();
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}
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@Test
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public void noBytesIn_noBytesOut() throws IOException {
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String input = "";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void oneCharacter_notRemoved() throws IOException {
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String input = "x";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void allNonCommentCharacters_notRemoved() throws IOException {
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String input = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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+ "`1234567890-=~!@#$%^&*()_+[]\\',./{}|:\"<>?";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void oneComment_Removed() throws IOException {
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String input = ";comment";
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String expectedResult = "";
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assertEquals(expectedResult, getLispFilterInputStreamResult(input));
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}
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@Test
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public void multipleComments_Removed() throws IOException {
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String input = ";comment1\n;comment2\n;comment3";
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String expectedResult = "\n\n";
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assertEquals(expectedResult, getLispFilterInputStreamResult(input));
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}
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@Test
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public void nil_NotRemoved() throws IOException {
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String input = "()";
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String expectedResult = "()";
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assertEquals(expectedResult, getLispFilterInputStreamResult(input));
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}
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@Test
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public void interiorComment_Removed() throws IOException {
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String input = "(;this is a comment\n)";
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String expectedResult = "(\n)";
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assertEquals(expectedResult, getLispFilterInputStreamResult(input));
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}
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@Test
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public void commentInString_NotRemoved() throws IOException {
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String input = "\"string;this should remain\"";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void commentInStringWithNewline_NotRemoved() throws IOException {
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String input = "\"string;this should\n remain\"";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void commentInStringWithEscapedDoubleQuote_NotRemoved() throws IOException {
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String input = "\"string \\\" ;this should remain\"";
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assertEquals(input, getLispFilterInputStreamResult(input));
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}
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@Test
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public void manyCommentsWithStatements_OnlyCommentsRemoved() throws IOException {
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String input = ";first comment \n '(1 2 3) \n ;second comment \n (defun add1 (x) (+ x 1)) ;third comment";
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String expectedResult = "\n '(1 2 3) \n \n (defun add1 (x) (+ x 1)) ";
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assertEquals(expectedResult, getLispFilterInputStreamResult(input));
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}
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private String getLispFilterInputStreamResult(String inputString) throws IOException {
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InputStream stringInputStream = TestUtilities.createInputStreamFromString(inputString);
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LispFilterInputStream lispFilterInputStream = new LispFilterInputStream(stringInputStream);
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return readInputStreamIntoString(lispFilterInputStream);
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}
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private String readInputStreamIntoString(InputStream inputStream) throws IOException {
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int c = inputStream.read();
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while (c != -1) {
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charactersRead.append((char) c);
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c = inputStream.read();
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}
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return charactersRead.toString();
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}
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}
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