Chapter 31: Software Drawing and Graphical Gameslinear-chapter31linear

Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: Symious <14933944+symious@users.noreply.github.com>
Co-authored-by: Jun Kawasaki <jun784@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/test/java/com/seaofnodes/simple/GraphicsTest.java b/src/test/java/com/seaofnodes/simple/GraphicsTest.java
new file mode 100644
index 00000000..9c432ce4
--- /dev/null
+++ b/src/test/java/com/seaofnodes/simple/GraphicsTest.java
@@ -0,0 +1,75 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.util.Ary;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+// These tests never open a window and do not need MiniFB installed.
+public class GraphicsTest {
+    private static String graphics, text, game;
+
+    @BeforeClass public static void compilePrograms() throws Exception {
+        var paths = new Ary<>(new String[]{TestC.RELEASE_SYS_DIR});
+        graphics = TestC.compile(Files.readString(Path.of("docs/examples/Graphics.smp")),
+            "graphics_missing",paths,TestC.CALL_CONVENTION,null,null,-1);
+        text = TestC.compile("val main={ -> sys.io.p(\"text still works\\n\"); return 0; };",
+            "graphics_text",paths,TestC.CALL_CONVENTION,null,null,-1);
+        game = TestC.compile(Files.readString(Path.of("docs/examples/TicTacToeGraphical.smp")),
+            "graphics_game",paths,TestC.CALL_CONVENTION,null,null,-1);
+    }
+
+    private static String run(String exe, String backend, int exit) throws Exception {
+        ProcessBuilder pb = new ProcessBuilder(exe).redirectErrorStream(true);
+        if( backend == null ) pb.environment().remove("SIMPLE_MINIFB");
+        else pb.environment().put("SIMPLE_MINIFB",backend);
+        Process child = pb.start();
+        try {
+            assertTrue("native program timed out",child.waitFor(10,TimeUnit.SECONDS));
+            String output = new String(child.getInputStream().readAllBytes(),java.nio.charset.StandardCharsets.UTF_8);
+            assertEquals(output,exit,child.exitValue());
+            return output;
+        } finally { if( child.isAlive() ) child.destroyForcibly(); }
+    }
+
+    @Test public void missingConfiguration() throws Exception {
+        String output = run(graphics,null,1);
+        assertTrue(output,output.contains("MiniFB backend not configured"));
+        assertTrue(output,output.contains("make graphics"));
+    }
+
+    @Test public void disabledGraphics() throws Exception {
+        assertTrue(run(graphics,"off",1).contains("disabled"));
+    }
+
+    @Test public void gameWithoutBackend() throws Exception {
+        assertTrue(run(game,"off",1).contains("disabled"));
+    }
+
+    @Test public void missingLibrary() throws Exception {
+        String missing = Path.of("build","no-such-minifb-backend").toAbsolutePath().toString();
+        String output = run(graphics,missing,1);
+        assertTrue(output,output.contains("cannot load MiniFB backend"));
+    }
+
+    @Test public void textIgnoresGraphicsConfiguration() throws Exception {
+        assertEquals("text still works\n",run(text,"off",0));
+        assertEquals("text still works\n",run(text,"no-such-backend",0));
+    }
+
+    @Test public void incompatibleLibrary() throws Exception {
+        Path source = Path.of("build/objs/graphics_incompatible.c");
+        Path library = Path.of("build/objs/graphics_incompatible" +
+            (TestC.OS.startsWith("Windows") ? ".dll" : ".so"));
+        Files.writeString(source,"""
+            #include "simple_graphics.h"
+            static const struct simple_graphics_api api = {999};
+            const struct simple_graphics_api *simple_minifb_api(void) { return &api; }
+            """);
+        TestC.exec(30,"gcc","-shared","-fPIC","-Isrc/main/c",source.toString(),"-o",library.toString());
+        assertTrue(run(graphics,library.toAbsolutePath().toString(),1).contains("incompatible MiniFB backend"));
+    }
+}