content: package com.termux.terminal;
  
  import junit.framework.AssertionFailedError;
  import junit.framework.TestCase;
  
  import java.io.ByteArrayOutputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Objects;
  import java.util.Set;
  
  public abstract class TerminalTestCase extends TestCase {
  
  	public static class MockTerminalOutput extends TerminalOutput {
  		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
  		public final List<ChangedTitle> titleChanges = new ArrayList<>();
  		public final List<String> clipboardPuts = new ArrayList<>();
  		public int bellsRung = 0;
  		public int colorsChanged = 0;
  
  		@Override
  		public void write(byte[] data, int offset, int count) {
  			baos.write(data, offset, count);
  		}
  
  		public String getOutputAndClear() {
  			String result = new String(baos.toByteArray(), StandardCharsets.UTF_8);
  			baos.reset();
  			return result;
  		}
  
  		@Override
  		public void titleChanged(String oldTitle, String newTitle) {
  			titleChanges.add(new ChangedTitle(oldTitle, newTitle));
  		}
  
  		@Override
  		public void onCopyTextToClipboard(String text) {
  			clipboardPuts.add(text);
  		}
  
          @Override
          public void onPasteTextFromClipboard() {
          }
  
  		@Override
  		public void onBell() {
  			bellsRung++;
  		}
  
  		@Override
  		public void onColorsChanged() {
  			colorsChanged++;
  		}
  	}
  
  	public TerminalEmulator mTerminal;
  	public MockTerminalOutput mOutput;
  
  	public static final class ChangedTitle {
  		final String oldTitle;
  		final String newTitle;
  
  		public ChangedTitle(String oldTitle, String newTitle) {
  			this.oldTitle = oldTitle;
  			this.newTitle = newTitle;
  		}
  
  		@Override
  		public boolean equals(Object o) {
  			if (!(o instanceof ChangedTitle)) return false;
  			ChangedTitle other = (ChangedTitle) o;
  			return Objects.equals(oldTitle, other.oldTitle) && Objects.equals(newTitle, other.newTitle);
  		}
  
  		@Override
  		public int hashCode() {
  			return Objects.hash(oldTitle, newTitle);
  		}
  
  		@Override
  		public String toString() {
  			return "ChangedTitle[oldTitle=" + oldTitle + ", newTitle=" + newTitle + "]";
  		}
  
  	}
  
  	public TerminalTestCase enterString(String s) {
  		byte[] bytes = s.getBytes(StandardCharsets.UTF_8);
  		mTerminal.append(bytes, bytes.length);
  		assertInvariants();
  		return this;
  	}
  
  	public void assertEnteringStringGivesResponse(String input, String expectedResponse) {
  		enterString(input);
  		String response = mOutput.getOutputAndClear();
  		assertEquals(expectedResponse, response);
  	}
  
  	@Override
  	protected void setUp() throws Exception {
  		super.setUp();
  		mOutput = new MockTerminalOutput();
  	}
  
  	protected TerminalTestCase withTerminalSized(int columns, int rows) {
  	    // The tests aren't currently using the client, so a null client will suffice, a dummy client should be implemented if needed
  		mTerminal = new TerminalEmulator(mOutput, columns, rows, rows * 2, null);
  		return this;
  	}
  
  	public void assertHistoryStartsWith(String... rows) {
  		assertTrue("About to check " + rows.length + " lines, but only " + mTerminal.getScreen().getActiveTranscriptRows() + " in history",
  				mTerminal.getScreen().getActiveTranscriptRows() >= rows.length);
  		for (int i = 0; i < rows.length; i++) {
  			assertLineIs(-i - 1, rows[i]);
  		}
  	}
  
  	private static final class LineWrapper {
  		final TerminalRow mLine;
  
  		public LineWrapper(TerminalRow line) {
  			mLine = line;
  		}
  
  		@Override
  		public int hashCode() {
  			return System.identityHashCode(mLine);
  		}
  
  		@Override
  		public boolean equals(Object o) {
  			return o instanceof LineWrapper && ((LineWrapper) o).mLine == mLine;
  		}
  	}
  
  	protected TerminalTestCase assertInvariants() {
  		TerminalBuffer screen = mTerminal.getScreen();
  		TerminalRow[] lines = screen.mLines;
  
  		Set<LineWrapper> linesSet = new HashSet<>();
  		for (int i = 0; i < lines.length; i++) {
  			if (lines[i] == null) continue;
  			assertTrue("Line exists at multiple places: " + i, linesSet.add(new LineWrapper(lines[i])));
  			char[] text = lines[i].mText;
  			int usedChars = lines[i].getSpaceUsed();
  			int currentColumn = 0;
  			for (int j = 0; j < usedChars; j++) {
  				char c = text[j];
  				int codePoint;
  				if (Character.isHighSurrogate(c)) {
  					char lowSurrogate = text[++j];
  					assertTrue("High surrogate without following low surrogate", Character.isLowSurrogate(lowSurrogate));
  					codePoint = Character.toCodePoint(c, lowSurrogate);
  				} else {
  					assertFalse("Low surrogate without preceding high surrogate", Character.isLowSurrogate(c));
  					codePoint = c;
  				}
  				assertFalse("Screen should never contain unassigned characters", Character.getType(codePoint) == Character.UNASSIGNED);
  				int width = WcWidth.width(codePoint);
  				assertFalse("The first column should not start with combining character", currentColumn == 0 && width < 0);
  				if (width > 0) currentColumn += width;
  			}
  			assertEquals("Line whose width does not match screens. line=" + new String(lines[i].mText, 0, lines[i].getSpaceUsed()),
  					screen.mColumns, currentColumn);
  		}
  
  		assertEquals("The alt buffer should have have no history", mTerminal.mAltBuffer.mTotalRows, mTerminal.mAltBuffer.mScreenRows);
  		if (mTerminal.isAlternateBufferActive()) {
  			assertEquals("The alt buffer should be the same size as the screen", mTerminal.mRows, mTerminal.mAltBuffer.mTotalRows);
  		}
  
  		return this;
  	}
  
  	protected void assertLineIs(int line, String expected) {
  		TerminalRow l = mTerminal.getScreen().allocateFullLineIfNecessary(mTerminal.getScreen().externalToInternalRow(line));
  		char[] chars = l.mText;
  		int textLen = l.getSpaceUsed();
  		if (textLen != expected.length()) fail("Expected '" + expected + "' (len=" + expected.length() + "), was='"
  				+ new String(chars, 0, textLen) + "' (len=" + textLen + ")");
  		for (int i = 0; i < textLen; i++) {
  			if (expected.charAt(i) != chars[i])
  				fail("Expected '" + expected + "', was='" + new String(chars, 0, textLen) + "' - first different at index=" + i);
  		}
  	}
  
  	public TerminalTestCase assertLinesAre(String... lines) {
  		assertEquals(lines.length, mTerminal.getScreen().mScreenRows);
  		for (int i = 0; i < lines.length; i++)
  			try {
  				assertLineIs(i, lines[i]);
  			} catch (AssertionFailedError e) {
  				throw new AssertionFailedError("Line: " + i + " - " + e.getMessage());
  			}
  		return this;
  	}
  
  	public TerminalTestCase resize(int cols, int rows) {
  		mTerminal.resize(cols, rows);
  		assertInvariants();
  		return this;
  	}
  
  	public TerminalTestCase assertLineWraps(boolean... lines) {
  		for (int i = 0; i < lines.length; i++)
  			assertEquals("line=" + i, lines[i], mTerminal.getScreen().mLines[mTerminal.getScreen().externalToInternalRow(i)].mLineWrap);
  		return this;
  	}
  
  	protected TerminalTestCase assertLineStartsWith(int line, int... codePoints) {
  		char[] chars = mTerminal.getScreen().mLines[mTerminal.getScreen().externalToInternalRow(line)].mText;
  		int charIndex = 0;
  		for (int i = 0; i < codePoints.length; i++) {
  			int lineCodePoint = chars[charIndex++];
  			if (Character.isHighSurrogate((char) lineCodePoint)) {
  				lineCodePoint = Character.toCodePoint((char) lineCodePoint, chars[charIndex++]);
  			}
  			assertEquals("Differing a code point index=" + i, codePoints[i], lineCodePoint);
  		}
  		return this;
  	}
  
  	protected TerminalTestCase placeCursorAndAssert(int row, int col) {
  		// +1 due to escape sequence being one based.
  		enterString("\033[" + (row + 1) + ";" + (col + 1) + "H");
  		assertCursorAt(row, col);
  		return this;
  	}
  
  	public TerminalTestCase assertCursorAt(int row, int col) {
  		int actualRow = mTerminal.getCursorRow();
  		int actualCol = mTerminal.getCursorCol();
  		if (!(row == actualRow && col == actualCol))
  			fail("Expected cursor at (row,col)=(" + row + ", " + col + ") but was (" + actualRow + ", " + actualCol + ")");
  		return this;
  	}
  
  	/** For testing only. Encoded style according to {@link TextStyle}. */
  	public long getStyleAt(int externalRow, int column) {
  		return mTerminal.getScreen().getStyleAt(externalRow, column);
  	}
  
  	public static class EffectLine {
  		final int[] styles;
  
  		public EffectLine(int[] styles) {
  			this.styles = styles;
  		}
  	}
  
  	protected EffectLine effectLine(int... bits) {
  		return new EffectLine(bits);
  	}
  
  	public TerminalTestCase assertEffectAttributesSet(EffectLine... lines) {
  		assertEquals(lines.length, mTerminal.getScreen().mScreenRows);
  		for (int i = 0; i < lines.length; i++) {
  			int[] line = lines[i].styles;
  			for (int j = 0; j < line.length; j++) {
  				int effectsAtCell = TextStyle.decodeEffect(getStyleAt(i, j));
  				int attributes = line[j];
  				if ((effectsAtCell & attributes) != attributes) fail("Line=" + i + ", column=" + j + ", expected "
  						+ describeStyle(attributes) + " set, was " + describeStyle(effectsAtCell));
  			}
  		}
  		return this;
  	}
  
  	public TerminalTestCase assertForegroundIndices(EffectLine... lines) {
  		assertEquals(lines.length, mTerminal.getScreen().mScreenRows);
  		for (int i = 0; i < lines.length; i++) {
  			int[] line = lines[i].styles;
  			for (int j = 0; j < line.length; j++) {
  				int actualColor = TextStyle.decodeForeColor(getStyleAt(i, j));
  				int expectedColor = line[j];
  				if (actualColor != expectedColor) fail("Line=" + i + ", column=" + j + ", expected color "
  						+ Integer.toHexString(expectedColor) + " set, was " + Integer.toHexString(actualColor));
  			}
  		}
  		return this;
  	}
  
  	private static String describeStyle(int styleBits) {
  		return "'" + ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_BLINK) != 0 ? ":BLINK:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_BOLD) != 0 ? ":BOLD:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_INVERSE) != 0 ? ":INVERSE:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_INVISIBLE) != 0 ? ":INVISIBLE:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_ITALIC) != 0 ? ":ITALIC:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_PROTECTED) != 0 ? ":PROTECTED:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_STRIKETHROUGH) != 0 ? ":STRIKETHROUGH:" : "")
  				+ ((styleBits & TextStyle.CHARACTER_ATTRIBUTE_UNDERLINE) != 0 ? ":UNDERLINE:" : "") + "'";
  	}
  
  	public void assertForegroundColorAt(int externalRow, int column, int color) {
  		long style = mTerminal.getScreen().mLines[mTerminal.getScreen().externalToInternalRow(externalRow)].getStyle(column);
  		assertEquals(color, TextStyle.decodeForeColor(style));
  	}
  
  	public TerminalTestCase assertColor(int colorIndex, int expected) {
  		int actual = mTerminal.mColors.mCurrentColors[colorIndex];
  		if (expected != actual) {
  			fail("Color index=" + colorIndex + ", expected=" + Integer.toHexString(expected) + ", was=" + Integer.toHexString(actual));
  		}
  		return this;
  	}
  }
  