feat: generate empty sub class for interface

demo/java-demo/src/main/java/com/alibaba/demo/basic/model/omni/Child.java

@@ -15,6 +15,14 @@ public class Child {
 
     private InnerChild subChild;
 
+    /**
+     * 这是一个私有内部类
+     * An private inner class
+     */
+    private class InnerChild {
+        private String secret;
+    }
+
     /* ---------------------------------------
     以下Getters/Setters方法仅为便于功能演示而添加
     并非OmniConstructor或OmniAccessor功能所需
@@ -36,12 +44,4 @@ public class Child {
         this.subChild = subChild;
     }
 
-    /**
-     * 这是一个私有内部类
-     * An private inner class
-     */
-    private class InnerChild {
-        private String secret;
-    }
-
 }

testable-core/src/main/java/com/alibaba/testable/core/tool/OmniConstructor.java

@@ -114,11 +114,11 @@ public class OmniConstructor {
         return array;
     }
 
-    private static <T> T newAbstractClass(Class<T> clazz) {
-        return null;
+    private static <T> T newAbstractClass(Class<T> clazz) throws InstantiationException {
+        return ConstructionUtil.generateSubClassOf(clazz);
     }
 
-    private static <T> T newInterface(Class<T> clazz) {
+    private static <T> T newInterface(Class<T> clazz) throws InstantiationException {
         if (clazz.equals(List.class)) {
             return (T)Collections.emptyList();
         } else if (clazz.equals(Map.class)) {
@@ -126,7 +126,7 @@ public class OmniConstructor {
         } else if (clazz.equals(Set.class)) {
             return (T)Collections.emptySet();
         }
-        return null;
+        return ConstructionUtil.generateSubClassOf(clazz);
     }
 
     private static <T> T newEnum(Class<T> clazz)

testable-core/src/main/java/com/alibaba/testable/core/util/ConstructionUtil.java

@@ -0,0 +1,35 @@
+package com.alibaba.testable.core.util;
+
+import com.alibaba.testable.core.compile.InMemoryJavaCompiler;
+
+import java.lang.reflect.Method;
+
+public class ConstructionUtil {
+
+    private static final String TESTABLE_IMPL = "$TestableImpl";
+    private static final String TESTABLE_OMNI_PKG = "com.alibaba.testable.omni";
+
+    public static <T> T generateSubClassOf(Class<T> clazz) throws InstantiationException {
+        StringBuilder sourceCode = new StringBuilder();
+        sourceCode.append("package ").append(TESTABLE_OMNI_PKG).append(";\n")
+                .append("public class ").append(getSubclassName(clazz))
+                .append(clazz.isInterface() ? " implements " : " extends ").append(clazz.getName()).append(" {\n");
+        for (Method m : clazz.getMethods()) {
+
+        }
+        sourceCode.append("}");
+
+        try {
+            Class<?> helloClass = InMemoryJavaCompiler.newInstance()
+                    .compile(TESTABLE_OMNI_PKG + "." + getSubclassName(clazz), sourceCode.toString());
+            return (T) helloClass.newInstance();
+        } catch (Exception e) {
+            throw new InstantiationException(e.toString());
+        }
+    }
+
+    private static String getSubclassName(Class<?> clazz) {
+        return clazz.getName() + TESTABLE_IMPL;
+    }
+
+}