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diff --git a/src/test/java/com/seaofnodes/simple/Chapter25Test.java b/src/test/java/com/seaofnodes/simple/Chapter25Test.java
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+++ b/src/test/java/com/seaofnodes/simple/Chapter25Test.java
@@ -0,0 +1,286 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.codegen.CodeGen;
+import com.seaofnodes.simple.codegen.ElfReader;
+import com.seaofnodes.simple.codegen.ParseAll;
+import com.seaofnodes.simple.type.TypeInteger;
+import com.seaofnodes.simple.util.Ary;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class Chapter25Test {
+
+    private static final String SYS_MODDIR = "src/main/smp";
+    private static final String SYS_BLDDIR = "build/objs/lib_"+TestC.CPU_ABI;
+    private static final String RELEASE_SYS_BLDDIR = TestC.RELEASE_SYS_DIR;
+
+    @Test
+    public void testPostfixFieldUpdate() {
+        String src = """
+            struct V {
+                u32 !len = 0;
+                i64[] !buf;
+                new V = { i64[] b -> buf=b; };
+                val grow = { i64 n -> self; };
+                val add = { i64 x -> grow(1).buf[len++] = x; self; };
+            };
+            return new V(new i64[1]).add(7).len;
+            """;
+        CodeGen code = new CodeGen(src).driver(CodeGen.Phase.TypeCheck);
+        assertEquals("1",Eval2.eval(code,0));
+    }
+
+    @Test
+    public void testStringEscapes() {
+        String src = "u8[~] s=\"A\\n\\t\\r\\\\\\\"B\"; " +
+            "return s#==7 && s[0]=='A' && s[1]==10 && s[2]==9 && s[3]==13 && " +
+            "s[4]==92 && s[5]==34 && s[6]=='B';";
+        CodeGen code = new CodeGen(src).driver(CodeGen.Phase.TypeCheck);
+        assertEquals("1",Eval2.eval(code,0));
+    }
+
+
+    @Test @Ignore
+    public void testModule0() throws IOException {
+        String MODDIR = "src/test/java/com/seaofnodes/simple/test0";
+        String BLDDIR = "build/objs/test0";
+        String a_obj  = BLDDIR+"/A.o";
+        String ab_obj = BLDDIR+"/A/B.o";
+        // Remove any prior results so the test runs from scratch.
+        delELFiles(new File(BLDDIR));
+        writeB(MODDIR,5);
+
+        // Compile MODDIR/A.smp into MODDIR/A.o
+        // Since A refers to B also:
+        // Compile MODDIR/A/B.smp into MODDIR/A/B.o
+        CodeGen code1 = new CodeGen(MODDIR, BLDDIR,null,
+                                    "A",null,123L,TypeInteger.BOT);
+        code1.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION);
+
+        // Verify produces A.o, A/B.o
+        File  a_file = new File( a_obj);
+        File ab_file = new File(ab_obj);
+        assertTrue(  a_file.exists() );
+        assertTrue( ab_file.exists() );
+        long  a_msec1 =  a_file.lastModified();
+        long ab_msec1 = ab_file.lastModified();
+
+        // Link and execute: arg is true, so compute "5+1" as the exit code
+        String rez1 = TestC.gcc("A", 1.2, a_obj, ab_obj);
+        assertEquals("exec exit code: 6",rez1);
+
+        // Compile again A, expecting both A.o and A/B.o to be up-to-date and not compiled
+        CodeGen code2 = new CodeGen(MODDIR, BLDDIR, null,
+                                   "A",null,123L,TypeInteger.BOT);
+        code2.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION);
+
+        assertTrue(  a_file.exists() );
+        assertTrue( ab_file.exists() );
+        long  a_msec2 =  a_file.lastModified();
+        long ab_msec2 = ab_file.lastModified();
+
+        assertEquals(  a_msec1,  a_msec2 );
+        assertEquals( ab_msec1, ab_msec2 );
+
+        // Touch A.smp and recompile.  A/B.o should not recompile.
+        new File(MODDIR+"/A.smp").setLastModified(System.currentTimeMillis());
+        CodeGen code3 = new CodeGen(MODDIR, BLDDIR,null,
+                                   "A",null,123L,TypeInteger.BOT);
+        code3.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION);
+
+        long  a_msec3 =  a_file.lastModified();
+        long ab_msec3 = ab_file.lastModified();
+        assertTrue  (  a_msec1 < a_msec3 );
+        assertEquals( ab_msec1, ab_msec3 );
+
+        // Link and execute: arg is true, so compute "5+1" as the exit code
+        String rez3 = TestC.gcc("A", 1.2, a_obj, ab_obj);
+        assertEquals("exec exit code: 6",rez3);
+
+
+        // Modify B.smp and recompile A/B.o; it should recompile and A.o should not.
+        writeB(MODDIR,7);
+        CodeGen code4 = new CodeGen(MODDIR, BLDDIR,null,
+                                   "A/B",null,123L,TypeInteger.BOT);
+        code4.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION);
+
+        long  a_msec4 =  a_file.lastModified();
+        long ab_msec4 = ab_file.lastModified();
+        assertEquals(  a_msec3,   a_msec4 );
+        assertTrue  ( ab_msec3 < ab_msec4 );
+
+        // Link and execute: uses stale A.o, so remains '6' not '7+1' == 8
+        String rez4 = TestC.gcc("A", 1.2, a_obj, ab_obj);
+        assertEquals("exec exit code: 6",rez4);
+
+        // Recompile A.o, it should recompile despite not being touched because
+        // it depends on A/B.o which recompiled in the prior step.
+        CodeGen code5 = new CodeGen(MODDIR, BLDDIR,null,
+                                   "A",null,123L,TypeInteger.BOT);
+        code5.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION);
+
+        long  a_msec5 =  a_file.lastModified();
+        long ab_msec5 = ab_file.lastModified();
+        assertTrue  (  a_msec4 < a_msec5 );
+        assertEquals( ab_msec4, ab_msec5 );
+
+        // Link and execute: updates A.o from B.o inlining, without compiling B.o
+        String rez5 = TestC.gcc("A", 1.2, a_obj, ab_obj);
+        assertEquals("exec exit code: 8",rez5);
+        // Reset for next time
+        writeB(MODDIR,5);
+    }
+
+    private void writeB(String MODDIR, int x) throws IOException {
+        var bsmp = new FileWriter(MODDIR+"/A/B.smp");
+        bsmp.write("val x="+x+";\n");
+        bsmp.close();
+    }
+
+
+    // Recursive search (TODO: gzip, archives) and delete all .o files
+    private void delELFiles( File dir) {
+        if( dir.isDirectory() )
+            for( File f : dir.listFiles() )
+                delELFiles(f);
+        else if( dir.getName().endsWith(".o") )
+            dir.delete();
+    }
+
+
+    private File buildTestSys(boolean clean) {
+        if( clean )
+            delELFiles(new File(SYS_BLDDIR));
+        File sys_file = new File(SYS_BLDDIR+"/sys.o" );
+        if( sys_file.exists() )
+            return sys_file;
+
+        // Compile SYS_MODDIR/sys.smp into SYS_BLDDIR/sys.o.  Chapter25
+        // compiler tests intentionally depend on this freshly built sys.o.
+        CodeGen code1 = new CodeGen(SYS_MODDIR, SYS_BLDDIR,null,
+                                    "sys",null,123L,TypeInteger.BOT);
+        code1.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION,false,false,0);
+        assertTrue( sys_file.exists() );
+        return sys_file;
+    }
+
+    @Test
+    public void testSys() {
+        delELFiles(new File(SYS_BLDDIR));
+
+        CodeGen code1 = new CodeGen(SYS_MODDIR, SYS_BLDDIR,null,
+                                    "sys",null,123L,TypeInteger.BOT);
+        code1.driver(CodeGen.Phase.Export,TestC.CPU_PORT,TestC.CALL_CONVENTION,false,false,0);
+
+        // Verify produces sys.o, sys/io.o
+        File sys_file = new File(SYS_BLDDIR+"/sys.o" );
+        assertTrue( sys_file.exists() );
+
+        // Can read the ELF files
+        ElfReader sys_elf = ElfReader.load( sys_file, null);
+        sys_elf.loadSimple(code1);
+
+        // Elf files are sane
+
+        // Sys depends on io, libc, aryi64, aryu8
+        assertEquals(6,sys_elf._deps.length);
+        assertSame("sys/aryu8" ,sys_elf._deps[0]);
+        assertSame("sys/io"    ,sys_elf._deps[1]);
+        assertSame("sys/aryi64",sys_elf._deps[2]);
+        assertSame("sys/Ary"   ,sys_elf._deps[3]);
+        assertSame("sys/Scan"  ,sys_elf._deps[4]);
+        assertSame("sys/libc"  ,sys_elf._deps[5]);
+        assertSame("class:sys" ,sys_elf._clz._name);
+    }
+
+    @Test
+    public void testHelloWorld() throws IOException {
+        File sys_file = buildTestSys(false);
+        assertTrue("Missing "+sys_file+"; testHelloWorld depends on testSys building it",  sys_file.exists());
+
+        String expected = "Hello, World!\n";
+        String prog = "return sys.io.p(\""+expected+"\") - "+expected.length()+";";
+        TestC.run(prog,"helloWorld",new Ary<>(new String[]{SYS_BLDDIR}),
+                  TestC.CALL_CONVENTION, null, null, expected,0);
+    }
+
+    @Test
+    public void testHelloWorldDriver() throws Exception {
+        File sys_file = new File(RELEASE_SYS_BLDDIR+"/sys.o");
+        assertTrue("Missing "+sys_file+"; run make release or make tests_sys first",  sys_file.exists());
+        Simple.main(new String[]{"-L",RELEASE_SYS_BLDDIR,"--norun","docs/examples/A_helloWorld.smp"});
+    }
+
+    @Test
+    public void testHelloWorldDriverLibFile() throws Exception {
+        File sys_file = new File(RELEASE_SYS_BLDDIR+"/sys.o");
+        assertTrue("Missing "+sys_file+"; run make release or make tests_sys first",  sys_file.exists());
+        Simple.main(new String[]{"-L",sys_file.toString(),"docs/examples/A_helloWorld.smp"});
+    }
+
+    @Test
+    public void testHelloWorldNoInline() throws Exception {
+        File sys_file = buildTestSys(false);
+        assertTrue("Missing "+sys_file+"; testHelloWorldNoInline depends on testSys building it",  sys_file.exists());
+
+        String base = "helloWorldNoInline";
+        String expected = "Hello, World!\n";
+        String prog = "return sys.io.p_noInline(\""+expected+"\") - "+expected.length()+";";
+        CodeGen code = new CodeGen(null,"build/objs",new Ary<>(new String[]{SYS_BLDDIR}),
+                                   base,prog,123L,TypeInteger.BOT);
+        code.driver(TestC.CPU_PORT,TestC.CALL_CONVENTION,false,true);
+
+        String obj = "build/objs/"+base+".o";
+        String exe = "build/objs/"+base+(TestC.OS.startsWith("Windows") ? ".exe" : "");
+        String syms = run(new String[]{"nm",obj});
+        assertTrue(syms, syms.contains(" U sys.io.p_noInline"));
+
+        String out = run(new String[]{"gcc",obj,sys_file.toString(),"-lm","-g","-o",exe});
+        assertEquals("",out);
+        String rez = run(new String[]{exe});
+        assertEquals(expected,rez);
+    }
+
+    private static String run(String[] cmd) throws Exception {
+        Process p = new ProcessBuilder(cmd).redirectErrorStream(true).start();
+        boolean normal = p.waitFor(5, TimeUnit.SECONDS);
+        String out = new String(p.getInputStream().readAllBytes());
+        assertTrue(out, normal);
+        assertEquals(out,0,p.exitValue());
+        return out;
+    }
+
+    @Test
+    public void testRedirectedRead() throws IOException {
+        File sys_file = buildTestSys(false);
+        assertTrue("Missing "+sys_file+"; testRedirectedRead depends on testSys building it",  sys_file.exists());
+        String src = """
+u8[] buf = new u8[10];
+i64 ptr = buf;
+int rez = sys.libc.read(0,ptr,buf#);
+return  rez < buf# ? 0 : sys.libc._exit(-2);
+""";
+        TestC.run(src,"redirectedRead",new Ary<>(new String[]{SYS_BLDDIR}),
+                  TestC.CALL_CONVENTION, null, null,
+                  "abc", "", -1);
+    }
+
+    @Test
+    public void testBubbles() throws IOException {
+        File sys_file = buildTestSys(false);
+        assertTrue("Missing "+sys_file+"; testBubbles depends on testSys building it",  sys_file.exists());
+        String src = Files.readString( Path.of("docs/examples/BubbleSort.smp"));
+        TestC.run(src,"BubbleSort",new Ary<>(new String[]{SYS_BLDDIR}),
+                  TestC.CALL_CONVENTION, null, null,
+                  "[3,  2,-17, 999 ] ", "[-17, 2, 3, 999]", -1);
+    }
+
+}