diff --git a/tests/cases/conformance/classes/mixinClassesAnnotated.ts b/tests/cases/conformance/classes/mixinClassesAnnotated.ts
new file mode 100644
index 00000000000..62f5e30c9a0
--- /dev/null
+++ b/tests/cases/conformance/classes/mixinClassesAnnotated.ts
@@ -0,0 +1,67 @@
+// @declaration: true
+
+type Constructor<T> = new(...args: any[]) => T;
+
+class Base {
+    constructor(public x: number, public y: number) {}
+}
+
+class Derived extends Base {
+    constructor(x: number, y: number, public z: number) {
+        super(x, y);
+    }
+}
+
+interface Printable {
+    print(): void;
+}
+
+const Printable = <T extends Constructor<Base>>(superClass: T): Constructor<Printable> & { message: string } & T =>
+    class extends superClass {
+        static message = "hello";
+        print() {
+            const output = this.x + "," + this.y;
+        }
+    }
+
+interface Tagged {
+    _tag: string;
+}
+
+function Tagged<T extends Constructor<{}>>(superClass: T): Constructor<Tagged> & T {
+    class C extends superClass {
+        _tag: string;
+        constructor(...args: any[]) {
+            super(...args);
+            this._tag = "hello";
+        }
+    }
+    return C;
+}
+
+const Thing1 = Tagged(Derived);
+const Thing2 = Tagged(Printable(Derived));
+Thing2.message;
+
+function f1() {
+    const thing = new Thing1(1, 2, 3);
+    thing.x;
+    thing._tag;
+}
+
+function f2() {
+    const thing = new Thing2(1, 2, 3);
+    thing.x;
+    thing._tag;
+    thing.print();
+}
+
+class Thing3 extends Thing2 {
+    constructor(tag: string) {
+        super(10, 20, 30);
+        this._tag = tag;
+    }
+    test() {
+        this.print();
+    }
+}
diff --git a/tests/cases/conformance/classes/mixinClassesAnonymous.ts b/tests/cases/conformance/classes/mixinClassesAnonymous.ts
new file mode 100644
index 00000000000..24289b61e3e
--- /dev/null
+++ b/tests/cases/conformance/classes/mixinClassesAnonymous.ts
@@ -0,0 +1,56 @@
+type Constructor<T> = new(...args: any[]) => T;
+
+class Base {
+    constructor(public x: number, public y: number) {}
+}
+
+class Derived extends Base {
+    constructor(x: number, y: number, public z: number) {
+        super(x, y);
+    }
+}
+
+const Printable = <T extends Constructor<Base>>(superClass: T) => class extends superClass {
+    static message = "hello";
+    print() {
+        const output = this.x + "," + this.y;
+    }
+}
+
+function Tagged<T extends Constructor<{}>>(superClass: T) {
+    class C extends superClass {
+        _tag: string;
+        constructor(...args: any[]) {
+            super(...args);
+            this._tag = "hello";
+        }
+    }
+    return C;
+}
+
+const Thing1 = Tagged(Derived);
+const Thing2 = Tagged(Printable(Derived));
+Thing2.message;
+
+function f1() {
+    const thing = new Thing1(1, 2, 3);
+    thing.x;
+    thing._tag;
+}
+
+function f2() {
+    const thing = new Thing2(1, 2, 3);
+    thing.x;
+    thing._tag;
+    thing.print();
+}
+
+class Thing3 extends Thing2 {
+    constructor(tag: string) {
+        super(10, 20, 30);
+        this._tag = tag;
+    }
+    test() {
+        this.print();
+    }
+}
diff --git a/tests/cases/conformance/classes/mixinClassesMembers.ts b/tests/cases/conformance/classes/mixinClassesMembers.ts
new file mode 100644
index 00000000000..905518c88f8
--- /dev/null
+++ b/tests/cases/conformance/classes/mixinClassesMembers.ts
@@ -0,0 +1,99 @@
+// @declaration: true
+
+declare class C1 {
+    public a: number;
+    protected b: number;
+    private c: number;
+    constructor(s: string);
+    constructor(n: number);
+}
+
+declare class M1 {
+    constructor(...args: any[]);
+    p: number;
+    static p: number;
+}
+
+declare class M2 {
+    constructor(...args: any[]);
+    f(): number;
+    static f(): number;
+}
+
+declare const Mixed1: typeof M1 & typeof C1;
+declare const Mixed2: typeof C1 & typeof M1;
+declare const Mixed3: typeof M2 & typeof M1 & typeof C1;
+declare const Mixed4: typeof C1 & typeof M1 & typeof M2;
+declare const Mixed5: typeof M1 & typeof M2;
+
+function f1() {
+    let x1 = new Mixed1("hello");
+    let x2 = new Mixed1(42);
+    let x3 = new Mixed2("hello");
+    let x4 = new Mixed2(42);
+    let x5 = new Mixed3("hello");
+    let x6 = new Mixed3(42);
+    let x7 = new Mixed4("hello");
+    let x8 = new Mixed4(42);
+    let x9 = new Mixed5();
+}
+
+function f2() {
+    let x = new Mixed1("hello");
+    x.a;
+    x.p;
+    Mixed1.p;
+}
+
+function f3() {
+    let x = new Mixed2("hello");
+    x.a;
+    x.p;
+    Mixed2.p;
+}
+
+function f4() {
+    let x = new Mixed3("hello");
+    x.a;
+    x.p;
+    x.f();
+    Mixed3.p;
+    Mixed3.f();
+}
+
+function f5() {
+    let x = new Mixed4("hello");
+    x.a;
+    x.p;
+    x.f();
+    Mixed4.p;
+    Mixed4.f();
+}
+
+function f6() {
+    let x = new Mixed5();
+    x.p;
+    x.f();
+    Mixed5.p;
+    Mixed5.f();
+}
+
+class C2 extends Mixed1 {
+    constructor() {
+        super("hello");
+        this.a;
+        this.b;
+        this.p;
+    }
+}
+
+class C3 extends Mixed3 {
+    constructor() {
+        super(42);
+        this.a;
+        this.b;
+        this.p;
+        this.f();
+    }
+    f() { return super.f(); }
+}