diff --git a/src/class-elements/private-getter-is-not-a-own-property.case b/src/class-elements/private-getter-is-not-a-own-property.case
new file mode 100644
index 0000000000..6e68090ee5
--- /dev/null
+++ b/src/class-elements/private-getter-is-not-a-own-property.case
@@ -0,0 +1,41 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Private getter is not stored as an own property of objects
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+template: default
+features: [class-methods-private]
+---*/
+
+//- elements
+get #m() { return "Test262"; }
+
+checkPrivateGetter() {
+  assert.sameValue(this.hasOwnProperty("#m"), false);
+  assert.sameValue("#m" in this, false);
+
+  assert.sameValue(this.__lookupGetter__("#m"), undefined);
+
+  assert.sameValue(this.#m, "Test262");
+
+  return 0;
+}
+//- assertions
+let c = new C();
+assert.sameValue(c.checkPrivateGetter(), 0);
diff --git a/src/class-elements/private-method-is-not-a-own-property.case b/src/class-elements/private-method-is-not-a-own-property.case
new file mode 100644
index 0000000000..6b7d532e38
--- /dev/null
+++ b/src/class-elements/private-method-is-not-a-own-property.case
@@ -0,0 +1,39 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Private method is not stored as an own property of objects
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+template: default
+features: [class-methods-private]
+---*/
+
+//- elements
+#m() { return "Test262"; }
+
+checkPrivateMethod() {
+  assert.sameValue(this.hasOwnProperty("#m"), false);
+  assert.sameValue("#m" in this, false);
+
+  assert.sameValue(this.#m(), "Test262");
+  
+  return 0;
+}
+//- assertions
+let c = new C();
+assert.sameValue(c.checkPrivateMethod(), 0);
diff --git a/src/class-elements/private-setter-is-not-a-own-property.case b/src/class-elements/private-setter-is-not-a-own-property.case
new file mode 100644
index 0000000000..8fe838ee86
--- /dev/null
+++ b/src/class-elements/private-setter-is-not-a-own-property.case
@@ -0,0 +1,42 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Private setter is not stored as an own property of objects
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+template: default
+features: [class-methods-private]
+---*/
+
+//- elements
+set #m(v) { this._v = v; }
+
+checkPrivateSetter() {
+  assert.sameValue(this.hasOwnProperty("#m"), false);
+  assert.sameValue("#m" in this, false);
+
+  assert.sameValue(this.__lookupSetter__("#m"), undefined);
+
+  this.#m = "Test262";
+  assert.sameValue(this._v, "Test262");
+
+  return 0;
+}
+//- assertions
+let c = new C();
+assert.sameValue(c.checkPrivateSetter(), 0);
diff --git a/test/language/expressions/class/elements/private-getter-is-not-a-own-property.js b/test/language/expressions/class/elements/private-getter-is-not-a-own-property.js
new file mode 100644
index 0000000000..8894ea7269
--- /dev/null
+++ b/test/language/expressions/class/elements/private-getter-is-not-a-own-property.js
@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-getter-is-not-a-own-property.case
+// - src/class-elements/default/cls-expr.template
+/*---
+description: Private getter is not stored as an own property of objects (field definitions in a class expression)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+var C = class {
+  get #m() { return "Test262"; }
+
+  checkPrivateGetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.__lookupGetter__("#m"), undefined);
+
+    assert.sameValue(this.#m, "Test262");
+
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateGetter(), 0);
diff --git a/test/language/expressions/class/elements/private-method-is-not-a-own-property.js b/test/language/expressions/class/elements/private-method-is-not-a-own-property.js
new file mode 100644
index 0000000000..2e136213f7
--- /dev/null
+++ b/test/language/expressions/class/elements/private-method-is-not-a-own-property.js
@@ -0,0 +1,43 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-method-is-not-a-own-property.case
+// - src/class-elements/default/cls-expr.template
+/*---
+description: Private method is not stored as an own property of objects (field definitions in a class expression)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+var C = class {
+  #m() { return "Test262"; }
+
+  checkPrivateMethod() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.#m(), "Test262");
+    
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateMethod(), 0);
diff --git a/test/language/expressions/class/elements/private-setter-is-not-a-own-property.js b/test/language/expressions/class/elements/private-setter-is-not-a-own-property.js
new file mode 100644
index 0000000000..695c931a94
--- /dev/null
+++ b/test/language/expressions/class/elements/private-setter-is-not-a-own-property.js
@@ -0,0 +1,46 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-setter-is-not-a-own-property.case
+// - src/class-elements/default/cls-expr.template
+/*---
+description: Private setter is not stored as an own property of objects (field definitions in a class expression)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+var C = class {
+  set #m(v) { this._v = v; }
+
+  checkPrivateSetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.__lookupSetter__("#m"), undefined);
+
+    this.#m = "Test262";
+    assert.sameValue(this._v, "Test262");
+
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateSetter(), 0);
diff --git a/test/language/statements/class/elements/private-field-is-not-clobbered-by-computed-property.js b/test/language/statements/class/elements/private-field-is-not-clobbered-by-computed-property.js
new file mode 100644
index 0000000000..7148cde7a3
--- /dev/null
+++ b/test/language/statements/class/elements/private-field-is-not-clobbered-by-computed-property.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Private field is not clobbered by computed property
+esid: sec-privatefieldget
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+features: [class-fields-public, class-fields-private, class]
+---*/
+
+class C {
+  #m = 44;
+  ["#m"] = this.#m / 11;
+
+  checkPrivateField() {
+    assert.sameValue(this.hasOwnProperty("#m"), true);
+    assert.sameValue("#m" in this, true);
+  
+    assert.sameValue(this["#m"], 4);
+  
+    assert.sameValue(this.#m, 44);
+  
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateField(), 0);
diff --git a/test/language/statements/class/elements/private-getter-is-not-a-own-property.js b/test/language/statements/class/elements/private-getter-is-not-a-own-property.js
new file mode 100644
index 0000000000..03ddc9acfb
--- /dev/null
+++ b/test/language/statements/class/elements/private-getter-is-not-a-own-property.js
@@ -0,0 +1,45 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-getter-is-not-a-own-property.case
+// - src/class-elements/default/cls-decl.template
+/*---
+description: Private getter is not stored as an own property of objects (field definitions in a class declaration)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+class C {
+  get #m() { return "Test262"; }
+
+  checkPrivateGetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.__lookupGetter__("#m"), undefined);
+
+    assert.sameValue(this.#m, "Test262");
+
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateGetter(), 0);
diff --git a/test/language/statements/class/elements/private-getter-is-not-clobbered-by-computed-property.js b/test/language/statements/class/elements/private-getter-is-not-clobbered-by-computed-property.js
new file mode 100644
index 0000000000..60adabb616
--- /dev/null
+++ b/test/language/statements/class/elements/private-getter-is-not-clobbered-by-computed-property.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Private getter is not clobbered by computed property
+esid: sec-privatefieldget
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+features: [class-methods-private, class-fields-public, class]
+---*/
+
+class C {
+  get #m() { return "Test262"; }
+  ["#m"] = 0;
+  
+  checkPrivateGetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), true);
+    assert.sameValue("#m" in this, true);
+  
+    assert.sameValue(this["#m"], 0);
+  
+    assert.sameValue(this.#m, "Test262");
+  
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateGetter(), 0);
diff --git a/test/language/statements/class/elements/private-method-is-not-a-own-property.js b/test/language/statements/class/elements/private-method-is-not-a-own-property.js
new file mode 100644
index 0000000000..3f4570191e
--- /dev/null
+++ b/test/language/statements/class/elements/private-method-is-not-a-own-property.js
@@ -0,0 +1,43 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-method-is-not-a-own-property.case
+// - src/class-elements/default/cls-decl.template
+/*---
+description: Private method is not stored as an own property of objects (field definitions in a class declaration)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+class C {
+  #m() { return "Test262"; }
+
+  checkPrivateMethod() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.#m(), "Test262");
+    
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateMethod(), 0);
diff --git a/test/language/statements/class/elements/private-method-is-not-clobbered-by-computed-property.js b/test/language/statements/class/elements/private-method-is-not-clobbered-by-computed-property.js
new file mode 100644
index 0000000000..a5a0a0cbbe
--- /dev/null
+++ b/test/language/statements/class/elements/private-method-is-not-clobbered-by-computed-property.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Private method is not clobbered by computed property
+esid: sec-privatefieldget
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+features: [class-methods-private, class-fields-public, class]
+---*/
+
+class C {
+  #m() { return "Test262"; }
+  ["#m"] = 0;
+  
+  checkPrivateMethod() {
+    assert.sameValue(this.hasOwnProperty("#m"), true);
+    assert.sameValue("#m" in this, true);
+  
+    assert.sameValue(this["#m"], 0);
+  
+    assert.sameValue(this.#m(), "Test262");
+  
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateMethod(), 0);
diff --git a/test/language/statements/class/elements/private-setter-is-not-a-own-property.js b/test/language/statements/class/elements/private-setter-is-not-a-own-property.js
new file mode 100644
index 0000000000..4b1ad372ec
--- /dev/null
+++ b/test/language/statements/class/elements/private-setter-is-not-a-own-property.js
@@ -0,0 +1,46 @@
+// This file was procedurally generated from the following sources:
+// - src/class-elements/private-setter-is-not-a-own-property.case
+// - src/class-elements/default/cls-decl.template
+/*---
+description: Private setter is not stored as an own property of objects (field definitions in a class declaration)
+esid: prod-FieldDefinition
+features: [class-methods-private, class]
+flags: [generated]
+info: |
+    PrivateFieldGet (P, O)
+      1. Assert: P is a Private Name.
+      2. If O is not an object, throw a TypeError exception.
+      3. If P.[[Kind]] is "field",
+        a. Let entry be PrivateFieldFind(P, O).
+        b. If entry is empty, throw a TypeError exception.
+        c. Return entry.[[PrivateFieldValue]].
+      4. Perform ? PrivateBrandCheck(O, P).
+      5. If P.[[Kind]] is "method",
+        a. Return P.[[Value]].
+      6. Else,
+        a. Assert: P.[[Kind]] is "accessor".
+        b. If P does not have a [[Get]] field, throw a TypeError exception.
+        c. Let getter be P.[[Get]].
+        d. Return ? Call(getter, O).
+
+---*/
+
+
+class C {
+  set #m(v) { this._v = v; }
+
+  checkPrivateSetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), false);
+    assert.sameValue("#m" in this, false);
+
+    assert.sameValue(this.__lookupSetter__("#m"), undefined);
+
+    this.#m = "Test262";
+    assert.sameValue(this._v, "Test262");
+
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateSetter(), 0);
diff --git a/test/language/statements/class/elements/private-setter-is-not-clobbered-by-computed-property.js b/test/language/statements/class/elements/private-setter-is-not-clobbered-by-computed-property.js
new file mode 100644
index 0000000000..d00cc733d1
--- /dev/null
+++ b/test/language/statements/class/elements/private-setter-is-not-clobbered-by-computed-property.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Private setter is not clobbered by computed property
+esid: sec-privatefieldget
+info: |
+  PrivateFieldGet (P, O)
+    1. Assert: P is a Private Name.
+    2. If O is not an object, throw a TypeError exception.
+    3. If P.[[Kind]] is "field",
+      a. Let entry be PrivateFieldFind(P, O).
+      b. If entry is empty, throw a TypeError exception.
+      c. Return entry.[[PrivateFieldValue]].
+    4. Perform ? PrivateBrandCheck(O, P).
+    5. If P.[[Kind]] is "method",
+      a. Return P.[[Value]].
+    6. Else,
+      a. Assert: P.[[Kind]] is "accessor".
+      b. If P does not have a [[Get]] field, throw a TypeError exception.
+      c. Let getter be P.[[Get]].
+      d. Return ? Call(getter, O).
+features: [class-methods-private, class-fields-public, class]
+---*/
+
+class C {
+  set #m(v) { this._v = v; }
+  ["#m"] = 0;
+  
+  checkPrivateSetter() {
+    assert.sameValue(this.hasOwnProperty("#m"), true);
+    assert.sameValue("#m" in this, true);
+  
+    assert.sameValue(this["#m"], 0);
+  
+    this.#m = "Test262";
+    assert.sameValue(this._v, "Test262");
+  
+    return 0;
+  }
+}
+
+let c = new C();
+assert.sameValue(c.checkPrivateSetter(), 0);