TLS and Graphics, what more?

lib3270j/src/test/java/org/lib3270j/datastream/QueryReplyBuilderTest.java

@@ -3,6 +3,7 @@ package org.lib3270j.datastream;
 import org.junit.jupiter.api.Test;
 import org.lib3270j.TerminalModel;
 import org.lib3270j.charset.EbcdicTranslator;
+import org.lib3270j.graphics.GraphicsMode;
 import org.lib3270j.screen.ScreenBuffer;
 import static org.junit.jupiter.api.Assertions.*;
 import static org.lib3270j.protocol.DS3270Constants.*;
@@ -14,11 +15,43 @@ public class QueryReplyBuilderTest {
     private final QueryReplyBuilder qrBuilder = new QueryReplyBuilder(screen);
 
     @Test
-    public void testBuildAllQueryReplies() {
+    public void testBuildAllQueryRepliesDefaultNone() {
+        assertEquals(GraphicsMode.NONE, qrBuilder.getGraphicsMode());
         byte[] replies = qrBuilder.buildAllQueryReplies(80, 43, 80 * 43);
         assertNotNull(replies);
         assertTrue(replies.length > 0);
         assertEquals((byte) AID_SF, replies[0]);
+
+        // In GraphicsMode.NONE, Vector Graphics QR 0xB0 must NOT be present
+        boolean hasB0 = false;
+        for (int i = 0; i < replies.length - 3; i++) {
+            if ((replies[i] & 0xFF) == 0x81 && (replies[i + 1] & 0xFF) == QR_GRAPHICS) {
+                hasB0 = true;
+                break;
+            }
+        }
+        assertFalse(hasB0);
+    }
+
+    @Test
+    public void testBuildAllQueryRepliesWithVectorGraphics() {
+        qrBuilder.setGraphicsMode(GraphicsMode.VECTOR_GRAPHICS);
+        byte[] replies = qrBuilder.buildAllQueryReplies(80, 43, 80 * 43);
+        assertNotNull(replies);
+
+        // Vector Graphics QR 0xB0 and 0xB4 must be present
+        boolean hasB0 = false;
+        boolean hasB4 = false;
+        for (int i = 0; i < replies.length - 3; i++) {
+            if ((replies[i] & 0xFF) == 0x81 && (replies[i + 1] & 0xFF) == QR_GRAPHICS) {
+                hasB0 = true;
+            }
+            if ((replies[i] & 0xFF) == 0x81 && (replies[i + 1] & 0xFF) == QR_GCOLOR) {
+                hasB4 = true;
+            }
+        }
+        assertTrue(hasB0);
+        assertTrue(hasB4);
     }
 
     @Test
@@ -52,4 +85,29 @@ public class QueryReplyBuilderTest {
         assertEquals(0x81, replies[3] & 0xFF);
         assertEquals(QR_NULL, replies[4] & 0xFF);
     }
+
+    @Test
+    public void testImplicitPartitionModel4() {
+        byte[] requested = new byte[] { (byte) QR_IMP_PART };
+        byte[] replies = qrBuilder.buildQueryReplies(requested, 80, 43, 80 * 43);
+
+        assertNotNull(replies);
+        assertEquals((byte) AID_SF, replies[0]);
+        int len = ((replies[1] & 0xFF) << 8) | (replies[2] & 0xFF);
+        assertEquals(0x81, replies[3] & 0xFF); // SFID_QREPLY
+        assertEquals(QR_IMP_PART, replies[4] & 0xFF); // 0xA6
+
+        // Payload starts at index 5: 22 bytes total
+        // Default size = 80 x 24
+        int defCols = ((replies[10] & 0xFF) << 8) | (replies[11] & 0xFF);
+        int defRows = ((replies[12] & 0xFF) << 8) | (replies[13] & 0xFF);
+        assertEquals(80, defCols);
+        assertEquals(24, defRows);
+
+        // Alt size = 80 x 43
+        int altCols = ((replies[14] & 0xFF) << 8) | (replies[15] & 0xFF);
+        int altRows = ((replies[16] & 0xFF) << 8) | (replies[17] & 0xFF);
+        assertEquals(80, altCols);
+        assertEquals(43, altRows);
+    }
 }

lib3270j/src/test/java/org/lib3270j/graphics/GocaDecoderTest.java

@@ -0,0 +1,237 @@
+package org.lib3270j.graphics;
+
+import org.junit.jupiter.api.Test;
+import java.io.ByteArrayOutputStream;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class GocaDecoderTest {
+
+    @Test
+    public void testBasicLineAndColorOrders() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        assertFalse(plane.hasContent());
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        // Set Color to Red (GOCA Color 2) - 2 bytes: order, color
+        out.write(GocaConstants.G_GSCOL);
+        out.write(0x02); // Red
+
+        // Line from (1000, 1000) to (2000, 2000) - long order: order, len, x1, y1, x2, y2
+        out.write(GocaConstants.G_GLINE);
+        out.write(0x08); // 8 bytes: (x1, y1, x2, y2)
+        out.write((1000 >> 8) & 0xFF); out.write(1000 & 0xFF);
+        out.write((1000 >> 8) & 0xFF); out.write(1000 & 0xFF);
+        out.write((2000 >> 8) & 0xFF); out.write(2000 & 0xFF);
+        out.write((2000 >> 8) & 0xFF); out.write(2000 & 0xFF);
+
+        byte[] stream = out.toByteArray();
+        decoder.decodeStream(stream, 0, stream.length);
+
+        assertTrue(plane.hasContent());
+    }
+
+    @Test
+    public void testAreaAndPatternFill() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        // Set Pattern to Solid - 2 bytes: order, pattern
+        out.write(GocaConstants.G_GSPT);
+        out.write(GocaConstants.PT_SOLID);
+
+        // Begin Area - 2 bytes: order, flags
+        out.write(GocaConstants.G_GBAR);
+        out.write(0x00);
+
+        // Polyline forming a triangle: (500, 500) -> (1500, 500) -> (1000, 1500) -> (500, 500)
+        out.write(GocaConstants.G_GLINE);
+        out.write(0x10); // 4 points * 4 bytes = 16 bytes
+        out.write((500 >> 8) & 0xFF);  out.write(500 & 0xFF);
+        out.write((500 >> 8) & 0xFF);  out.write(500 & 0xFF);
+
+        out.write((1500 >> 8) & 0xFF); out.write(1500 & 0xFF);
+        out.write((500 >> 8) & 0xFF);  out.write(500 & 0xFF);
+
+        out.write((1000 >> 8) & 0xFF); out.write(1000 & 0xFF);
+        out.write((1500 >> 8) & 0xFF); out.write(1500 & 0xFF);
+
+        out.write((500 >> 8) & 0xFF);  out.write(500 & 0xFF);
+        out.write((500 >> 8) & 0xFF);  out.write(500 & 0xFF);
+
+        // End Area - 1 byte
+        out.write(GocaConstants.G_GEAR);
+
+        byte[] stream = out.toByteArray();
+        decoder.decodeStream(stream, 0, stream.length);
+
+        assertTrue(plane.hasContent());
+    }
+
+    @Test
+    public void testMarkerAndVectorText() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        // Set Marker Type to Circle - 2 bytes: order, type
+        out.write(GocaConstants.G_GSMT);
+        out.write(GocaConstants.MK_CIRCLE);
+
+        // Draw Marker at (2000, 2000)
+        out.write(GocaConstants.G_GMRK);
+        out.write(0x04);
+        out.write((2000 >> 8) & 0xFF); out.write(2000 & 0xFF);
+        out.write((2000 >> 8) & 0xFF); out.write(2000 & 0xFF);
+
+        // Draw Vector Stroked Character String: "IBM" (EBCDIC: 0xC9, 0xC2, 0xD4)
+        out.write(GocaConstants.G_GCHST);
+        out.write(0x07); // 4 bytes pos + 3 bytes chars
+        out.write((1000 >> 8) & 0xFF); out.write(1000 & 0xFF);
+        out.write((1000 >> 8) & 0xFF); out.write(1000 & 0xFF);
+        out.write(0xC9); out.write(0xC2); out.write(0xD4);
+
+        byte[] stream = out.toByteArray();
+        decoder.decodeStream(stream, 0, stream.length);
+
+        assertTrue(plane.hasContent());
+    }
+
+    @Test
+    public void testProcedureOrdersAndErase() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        // Draw something first
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        out.write(GocaConstants.G_GLINE);
+        out.write(0x08);
+        out.write(0x00); out.write(0x00);
+        out.write(0x00); out.write(0x00);
+        out.write(0x00); out.write(0x64);
+        out.write(0x00); out.write(0x64);
+        byte[] drawStream = out.toByteArray();
+        decoder.decodeStream(drawStream, 0, drawStream.length);
+        assertTrue(plane.hasContent());
+
+        // Process procedure order 0x0A (Erase presentation space)
+        byte[] procOrders = new byte[] { (byte) GocaConstants.P_ERASE };
+        decoder.processProcedureOrders(procOrders, 0, procOrders.length);
+        assertFalse(plane.hasContent());
+    }
+
+    @Test
+    public void testSegmentAndRelativeLineOrders() {
+        GraphicsPlane plane = new GraphicsPlane(720, 688);
+        plane.setScreenDimensions(80, 43);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        // 0x70: Begin Segment (14 bytes total)
+        out.write(GocaConstants.G_BEGSEGM);
+        out.write(0x0C);
+        out.write(0x00); out.write(0x00); out.write(0x00); out.write(0x01); // Seg ID 1
+        out.write(0x74); out.write(0x70);
+        out.write(0x00); out.write(0x1E); out.write(0x00); out.write(0x00); out.write(0x00); out.write(0x00);
+
+        // 0x3E: End Prologue
+        out.write(GocaConstants.G_ENDPROLOGUE);
+        out.write(0x00);
+
+        // 0x0A: Color (7 = White)
+        out.write(GocaConstants.G_GSCOL);
+        out.write(0x07);
+
+        // 0xE1: Relative Line (Absolute Start (300, 200), deltas: (+10, -5), (-10, +5))
+        out.write(GocaConstants.G_GRLINE);
+        out.write(0x08); // 4 bytes start coord + 4 bytes (2 deltas) = 8 bytes
+        out.write(0x01); out.write(0x2C); // Start X = 300
+        out.write(0x00); out.write(0xC8); // Start Y = 200
+        out.write(0x0A); out.write(0xFB); // dx = +10, dy = -5
+        out.write(0xF6); out.write(0x05); // dx = -10, dy = +5
+
+        // 0x71: End Segment
+        out.write(GocaConstants.G_ENDSEGM);
+        out.write(0x00);
+
+        byte[] stream = out.toByteArray();
+        decoder.decodeStream(stream, 0, stream.length);
+        assertTrue(plane.hasContent());
+    }
+
+    @Test
+    public void testPartialOrderBufferingAcrossStreams() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        // First packet sends G_GLINE order code and half of its coordinates
+        ByteArrayOutputStream chunk1 = new ByteArrayOutputStream();
+        chunk1.write(GocaConstants.G_GLINE);
+        chunk1.write(0x08); // 8 bytes: 2 points
+        chunk1.write(0x00); chunk1.write(0x64); // x1 = 100
+        chunk1.write(0x00); chunk1.write(0x64); // y1 = 100
+
+        byte[] b1 = chunk1.toByteArray();
+        decoder.decodeStream(b1, 0, b1.length);
+        // Order is not complete yet, so no line drawn yet
+        assertFalse(plane.hasContent());
+
+        // Second packet sends the rest of the order: x2 = 200, y2 = 200
+        ByteArrayOutputStream chunk2 = new ByteArrayOutputStream();
+        chunk2.write(0x00); chunk2.write(0xC8); // x2 = 200
+        chunk2.write(0x00); chunk2.write(0xC8); // y2 = 200
+
+        byte[] b2 = chunk2.toByteArray();
+        decoder.decodeStream(b2, 0, b2.length);
+        // Now the combined order executes!
+        assertTrue(plane.hasContent());
+    }
+
+    @Test
+    public void testSetCurrentPositionAndRelativeLine() {
+        GraphicsPlane plane = new GraphicsPlane(400, 300);
+        GocaDecoder decoder = new GocaDecoder(plane);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        // 0x21: Set Current Position to (50, 50)
+        out.write(GocaConstants.G_GSCP);
+        out.write(0x04); // len = 4
+        out.write(0x00); out.write(0x32); // x = 50
+        out.write(0x00); out.write(0x32); // y = 50
+
+        // 0xA1: Relative Line from Current Position: (+10, +20), (-5, -10)
+        out.write(GocaConstants.G_GCRLIN);
+        out.write(0x04); // len = 4 (2 steps)
+        out.write(0x0A); out.write(0x14); // dx = +10, dy = +20
+        out.write(0xFB); out.write(0xF6); // dx = -5, dy = -10
+
+        byte[] stream = out.toByteArray();
+        decoder.decodeStream(stream, 0, stream.length);
+
+        assertTrue(plane.hasContent());
+        assertEquals(55, decoder.getCurX());
+        assertEquals(60, decoder.getCurY());
+    }
+
+    @Test
+    public void test3179GCoordinateMapping() {
+        GraphicsPlane plane = new GraphicsPlane(720, 688);
+        plane.setScreenDimensions(80, 43);
+
+        // Screen center (0, 0) should map to canvas center (360, 343)
+        assertEquals(360, plane.mapX(0));
+        assertEquals(343, plane.mapY(0));
+
+        // Left edge (-360) should map to 0
+        assertEquals(0, plane.mapX(-360));
+        // Right edge (+359) should map to 719
+        assertEquals(719, plane.mapX(359));
+
+        // Top edge (+343) should map to 0
+        assertEquals(0, plane.mapY(343));
+        // Bottom edge (-344) should map to 687
+        assertEquals(687, plane.mapY(-344));
+    }
+}

lib3270j/src/test/java/org/lib3270j/graphics/GraphicsModeTest.java

@@ -0,0 +1,57 @@
+package org.lib3270j.graphics;
+
+import org.junit.jupiter.api.Test;
+import org.lib3270j.ConnectionConfig;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class GraphicsModeTest {
+
+    @Test
+    public void testDefaultsAndParsing() {
+        assertEquals(GraphicsMode.NONE, GraphicsMode.fromString(null));
+        assertEquals(GraphicsMode.NONE, GraphicsMode.fromString(""));
+        assertEquals(GraphicsMode.NONE, GraphicsMode.fromString("NONE"));
+        assertEquals(GraphicsMode.NONE, GraphicsMode.fromString("off"));
+        assertEquals(GraphicsMode.NONE, GraphicsMode.fromString("false"));
+
+        assertEquals(GraphicsMode.PROGRAMMED_SYMBOLS, GraphicsMode.fromString("ps"));
+        assertEquals(GraphicsMode.PROGRAMMED_SYMBOLS, GraphicsMode.fromString("programmed_symbols"));
+        assertEquals(GraphicsMode.PROGRAMMED_SYMBOLS, GraphicsMode.fromString("apl"));
+
+        assertEquals(GraphicsMode.VECTOR_GRAPHICS, GraphicsMode.fromString("vector"));
+        assertEquals(GraphicsMode.VECTOR_GRAPHICS, GraphicsMode.fromString("goca"));
+        assertEquals(GraphicsMode.VECTOR_GRAPHICS, GraphicsMode.fromString("vector_graphics"));
+
+        assertEquals(GraphicsMode.BOTH, GraphicsMode.fromString("both"));
+        assertEquals(GraphicsMode.BOTH, GraphicsMode.fromString("all"));
+        assertEquals(GraphicsMode.BOTH, GraphicsMode.fromString("true"));
+        assertEquals(GraphicsMode.BOTH, GraphicsMode.fromString("on"));
+    }
+
+    @Test
+    public void testFlags() {
+        assertFalse(GraphicsMode.NONE.isProgrammedSymbolsEnabled());
+        assertFalse(GraphicsMode.NONE.isVectorGraphicsEnabled());
+
+        assertTrue(GraphicsMode.PROGRAMMED_SYMBOLS.isProgrammedSymbolsEnabled());
+        assertFalse(GraphicsMode.PROGRAMMED_SYMBOLS.isVectorGraphicsEnabled());
+
+        assertFalse(GraphicsMode.VECTOR_GRAPHICS.isProgrammedSymbolsEnabled());
+        assertTrue(GraphicsMode.VECTOR_GRAPHICS.isVectorGraphicsEnabled());
+
+        assertTrue(GraphicsMode.BOTH.isProgrammedSymbolsEnabled());
+        assertTrue(GraphicsMode.BOTH.isVectorGraphicsEnabled());
+    }
+
+    @Test
+    public void testConnectionConfigDefault() {
+        ConnectionConfig config = new ConnectionConfig();
+        assertEquals(GraphicsMode.NONE, config.getGraphicsMode());
+
+        config.setGraphicsMode(GraphicsMode.BOTH);
+        assertEquals(GraphicsMode.BOTH, config.getGraphicsMode());
+
+        config.setGraphicsMode(null);
+        assertEquals(GraphicsMode.NONE, config.getGraphicsMode());
+    }
+}

lib3270j/src/test/java/org/lib3270j/graphics/ProgramSymbolManagerTest.java

@@ -0,0 +1,144 @@
+package org.lib3270j.graphics;
+
+import org.junit.jupiter.api.Test;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ProgramSymbolManagerTest {
+
+    @Test
+    public void testSetAllocationAndLookup() {
+        ProgramSymbolManager manager = new ProgramSymbolManager();
+        // Loadable set can be queried after loadps or clearAll
+        assertNull(manager.getSymbolSet(0x40));
+        assertNull(manager.getSymbol(0x40, 0x41));
+
+        manager.clearAll();
+        assertNull(manager.getSymbolSet(0x40));
+    }
+
+    @Test
+    public void testSinglePlaneLoadPsFormat1() {
+        ProgramSymbolManager manager = new ProgramSymbolManager();
+
+        // Build Format 1 Load PS payload for LCID 0x40, code point 0x41 ('A')
+        // Format 1 header:
+        // byte 0: flags (0x01: format 1, single plane)
+        // byte 1: LCID (0x40)
+        // byte 2: Start code point (0x41)
+        // byte 3: RWS (0x02: loadable slot 2)
+        // followed by 18 bytes per symbol for 9x16 cell:
+        // Byte 0-1: Col 0 for rows 0..15 (0x80 = bit for row 0 col 0)
+        // Bytes 2-17: Cols 1..8 for rows 0..15 (0xFF = bits for row 0 cols 1..8)
+        byte[] payload = new byte[4 + 18];
+        payload[0] = 0x01; // Format 1
+        payload[1] = 0x40; // LCID 0x40
+        payload[2] = 0x41; // Code point 0x41
+        payload[3] = 0x02; // RWS 2
+
+        payload[4] = (byte) 0x80; // Row 0 Col 0 bit
+        payload[5] = (byte) 0x00; // Rows 8..15 Col 0
+        for (int r = 0; r < 16; r++) {
+            payload[6 + r] = (byte) 0xFF; // Cols 1..8 on all rows
+        }
+
+        manager.loadps(payload);
+
+        ProgramSymbolSet set = manager.getSymbolSet(0x40);
+        assertNotNull(set);
+        assertEquals(0x40, set.getLcid());
+        assertFalse(set.isTriplePlane());
+
+        ProgramSymbolSet.SymbolSlot slot = manager.getSymbol(0x40, 0x41);
+        assertNotNull(slot);
+        assertEquals(9, slot.getWidth());
+        assertEquals(16, slot.getHeight());
+        assertFalse(slot.isTriplePlane());
+
+        // Verify pixel data (Row 0 Col 0 is 1)
+        byte[] pixels = slot.getPixelData();
+        assertNotNull(pixels);
+        assertEquals(1, pixels[0]); // Row 0 Col 0 is 1
+
+        // Test rendering into BufferedImage
+        BufferedImage canvas = new BufferedImage(80, 24, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g2 = canvas.createGraphics();
+        boolean drawn = manager.drawSymbol(g2, 0x40, 0x41, 0, 0, 10, 20, Color.GREEN, Color.BLACK);
+        g2.dispose();
+        assertTrue(drawn);
+    }
+
+    @Test
+    public void testTriplePlaneMultiColorComposite() {
+        ProgramSymbolManager manager = new ProgramSymbolManager();
+
+        // Build Format 1 Load PS payload for LCID 0x42, triple plane
+        // flags = 0x01 (Format 1)
+        // RWS = 4 (Triple Plane)
+        byte[] payload = new byte[4 + 18];
+        payload[0] = 0x01; // Format 1
+        payload[1] = 0x42; // LCID 0x42
+        payload[2] = 0x45; // Code point 0x45
+        payload[3] = 0x04; // RWS 4 (Triple Plane)
+
+        // Set pixel at row 0 col 0
+        payload[4] = (byte) 0x80; // Row 0 Col 0
+        payload[5] = (byte) 0x00;
+        for (int r = 0; r < 16; r++) {
+            payload[6 + r] = (byte) 0x00;
+        }
+
+        manager.loadps(payload);
+
+        ProgramSymbolSet set = manager.getSymbolSet(0x42);
+        assertNotNull(set);
+        assertTrue(set.isTriplePlane());
+
+        ProgramSymbolSet.SymbolSlot slot = manager.getSymbol(0x42, 0x45);
+        assertNotNull(slot);
+        assertTrue(slot.isTriplePlane());
+
+        // When loaded with colorPlane=0 (default), all 3 planes are set (val 7 = white composite)
+        byte[] pixels = slot.getPixelData();
+        assertEquals(7, pixels[0] & 0xFF);
+
+        // Render image
+        BufferedImage img = slot.getImage(Color.WHITE, Color.BLACK);
+        assertNotNull(img);
+
+        // Pixel (0,0) should be white composite (Red=255, Green=255, Blue=255)
+        int rgb = img.getRGB(0, 0);
+        Color pixelColor = new Color(rgb, true);
+        assertEquals(255, pixelColor.getRed());
+        assertEquals(255, pixelColor.getGreen());
+        assertEquals(255, pixelColor.getBlue());
+    }
+
+    @Test
+    public void testFormat3Bitstream() {
+        ProgramSymbolManager manager = new ProgramSymbolManager();
+
+        // Format 3 payload
+        // byte 0: 0x03 (Format 3)
+        // byte 1: LCID (0x44)
+        // byte 2: code point (0x43)
+        // byte 3: RWS (2)
+        // followed by (9 * 16 + 7) / 8 = 18 bytes
+        byte[] payload = new byte[4 + 18];
+        payload[0] = 0x03; // Format 3
+        payload[1] = 0x44; // LCID 0x44
+        payload[2] = 0x43; // Code point 0x43
+        payload[3] = 0x02; // RWS 2
+        payload[4] = (byte) 0x80; // First pixel is set
+
+        manager.loadps(payload);
+
+        ProgramSymbolSet set = manager.getSymbolSet(0x44);
+        assertNotNull(set);
+        ProgramSymbolSet.SymbolSlot slot = manager.getSymbol(0x44, 0x43);
+        assertNotNull(slot);
+        assertEquals(1, slot.getPixelData()[0]);
+    }
+}

lib3270j/src/test/java/org/lib3270j/tls/TlsConfigTest.java

@@ -0,0 +1,108 @@
+package org.lib3270j.tls;
+
+import org.junit.jupiter.api.Test;
+import org.lib3270j.ConnectionConfig;
+import org.lib3270j.TerminalModel;
+
+import javax.net.ssl.SSLContext;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TlsConfigTest {
+
+    @Test
+    public void testConnectionConfigDefaults() {
+        ConnectionConfig config = new ConnectionConfig("localhost", 23);
+        assertFalse(config.isUseTls());
+        assertTrue(config.isTlsVerifyCert());
+        assertEquals("TLS", config.getSslProtocol());
+        assertNull(config.getCertificateVerifier());
+    }
+
+    @Test
+    public void testParseHostStringTlsPrefixes() {
+        // L: prefix
+        ConnectionConfig c1 = ConnectionConfig.parseHostString("L:mainframe.example.com", 0, TerminalModel.IBM_3279_4);
+        assertTrue(c1.isUseTls());
+        assertEquals("mainframe.example.com", c1.getHost());
+        assertEquals(992, c1.getPort());
+
+        // ssl: prefix with explicit port
+        ConnectionConfig c2 = ConnectionConfig.parseHostString("ssl:zos.local:2323", 0, TerminalModel.IBM_3279_2);
+        assertTrue(c2.isUseTls());
+        assertEquals("zos.local", c2.getHost());
+        assertEquals(2323, c2.getPort());
+
+        // y: prefix
+        ConnectionConfig c3 = ConnectionConfig.parseHostString("y:vm370.net:992", 23, TerminalModel.IBM_3279_4);
+        assertTrue(c3.isUseTls());
+        assertEquals("vm370.net", c3.getHost());
+        assertEquals(992, c3.getPort());
+
+        // Plain host
+        ConnectionConfig c4 = ConnectionConfig.parseHostString("plain.host.com", 23, TerminalModel.IBM_3279_4);
+        assertFalse(c4.isUseTls());
+        assertEquals("plain.host.com", c4.getHost());
+        assertEquals(23, c4.getPort());
+
+        // IPv6 host with brackets
+        ConnectionConfig c5 = ConnectionConfig.parseHostString("L:[2001:db8::1]:992", 0, TerminalModel.IBM_3279_4);
+        assertTrue(c5.isUseTls());
+        assertEquals("2001:db8::1", c5.getHost());
+        assertEquals(992, c5.getPort());
+    }
+
+    @Test
+    public void testTlsTrustManagerBypass() {
+        ConnectionConfig config = new ConnectionConfig("untrusted.host", 992);
+        config.setUseTls(true);
+        config.setTlsVerifyCert(false);
+
+        TlsTrustManager trustManager = new TlsTrustManager(config);
+        // With tlsVerifyCert=false, checkServerTrusted must not throw even with null/empty chain
+        assertDoesNotThrow(() -> trustManager.checkServerTrusted(new X509Certificate[0], "RSA"));
+    }
+
+    @Test
+    public void testTlsTrustManagerVerifierCallback() {
+        ConnectionConfig config = new ConnectionConfig("selfsigned.host", 992);
+        config.setUseTls(true);
+        config.setTlsVerifyCert(true);
+
+        AtomicBoolean verifierInvoked = new AtomicBoolean(false);
+        config.setCertificateVerifier((chain, authType, exception) -> {
+            verifierInvoked.set(true);
+            return true; // Accept certificate
+        });
+
+        TlsTrustManager trustManager = new TlsTrustManager(config);
+        // Standard verification will fail on empty cert chain, triggering our callback
+        assertDoesNotThrow(() -> trustManager.checkServerTrusted(new X509Certificate[0], "RSA"));
+        assertTrue(verifierInvoked.get(), "Expected verifier callback to be invoked");
+    }
+
+    @Test
+    public void testTlsTrustManagerVerifierRejection() {
+        ConnectionConfig config = new ConnectionConfig("badcert.host", 992);
+        config.setUseTls(true);
+        config.setTlsVerifyCert(true);
+
+        config.setCertificateVerifier((chain, authType, exception) -> false); // Reject certificate
+
+        TlsTrustManager trustManager = new TlsTrustManager(config);
+        assertThrows(CertificateException.class, () -> trustManager.checkServerTrusted(new X509Certificate[0], "RSA"));
+    }
+
+    @Test
+    public void testCreateSSLContext() throws Exception {
+        ConnectionConfig config = new ConnectionConfig("secure.host", 992);
+        config.setUseTls(true);
+
+        SSLContext context = TlsTrustManager.createSSLContext(config);
+        assertNotNull(context);
+        assertNotNull(context.getSocketFactory());
+    }
+}