diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractConstructorAssignability.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractConstructorAssignability.ts
new file mode 100644
index 0000000000..ecef21cc12
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractConstructorAssignability.ts
@@ -0,0 +1,14 @@
+
+class A {}
+
+abstract class B extends A {}
+
+class C extends B {}
+
+var AA : typeof A = B;
+var BB : typeof B = A;
+var CC : typeof C = B;
+
+new AA;
+new BB;
+new CC;
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractExtends.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractExtends.ts
new file mode 100644
index 0000000000..0aa57b7583
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractExtends.ts
@@ -0,0 +1,16 @@
+
+class A {
+    foo() {}
+}
+
+abstract class B extends A {
+    abstract bar();
+}
+
+class C extends B { }
+
+abstract class D extends B {}
+
+class E extends B {
+    bar() {}
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractFactoryFunction.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractFactoryFunction.ts
new file mode 100644
index 0000000000..73d33a34e1
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractFactoryFunction.ts
@@ -0,0 +1,17 @@
+
+class A {}
+abstract class B extends A {}
+
+function NewA(Factory: typeof A) {
+    return new A;
+}
+
+function NewB(Factory: typeof B) {
+    return new B;
+}
+
+NewA(A);
+NewA(B);
+
+NewB(A);
+NewB(B);
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInstantiations1.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInstantiations1.ts
index 4daf27b53e..c805a993a6 100644
--- a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInstantiations1.ts
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInstantiations1.ts
@@ -1,4 +1,8 @@
 
+//
+// Calling new with (non)abstract classes.
+//
+
 abstract class A {}
 
 class B extends A {}
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMethodInNonAbstractClass.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMethodInNonAbstractClass.ts
new file mode 100644
index 0000000000..98a2091bc0
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMethodInNonAbstractClass.ts
@@ -0,0 +1,7 @@
+class A {
+    abstract foo();
+}
+
+class B {
+    abstract foo() {}
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractOverrideWithAbstract.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractOverrideWithAbstract.ts
new file mode 100644
index 0000000000..7e02dbd4d9
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractOverrideWithAbstract.ts
@@ -0,0 +1,23 @@
+class A {
+    foo() {}
+}
+
+abstract class B extends A {
+    abstract foo();
+}
+
+abstract class AA {
+    foo() {}
+    abstract bar();
+}
+
+abstract class BB extends AA {
+    abstract foo();
+    bar () {}
+}
+
+class CC extends BB {} // error
+
+class DD extends BB {
+    foo() {}
+}
\ No newline at end of file