diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/exec.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/exec.js
index 5a2a7dab94..344a21c755 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/exec.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/exec.js
@@ -19,4 +19,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/input.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/input.js
index 5a2a7dab94..344a21c755 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/input.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/input.js
@@ -19,4 +19,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/output.js
index e94ddfeba6..f7f591a606 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/output.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-call-in-key/output.js
@@ -38,4 +38,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/exec.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/exec.js
index 7359814f19..5e0087f891 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/exec.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/exec.js
@@ -16,4 +16,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/input.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/input.js
index 7359814f19..5e0087f891 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/input.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/input.js
@@ -16,4 +16,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/output.js
index 0aa59affa5..58d0250eb2 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/output.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/nested-class/super-property-in-key/output.js
@@ -45,4 +45,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello, 'hello');
+expect(new Outer().hello).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/exec.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/exec.js
index 4dcb62d99f..73868b7759 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/exec.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/exec.js
@@ -21,4 +21,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/input.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/input.js
index 4dcb62d99f..73868b7759 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/input.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/input.js
@@ -21,4 +21,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/output.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/output.js
index 744cd7d4b4..eb661ef2b3 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/output.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-call-in-key/output.js
@@ -44,4 +44,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/exec.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/exec.js
index e6b8583a0b..25b5cb653b 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/exec.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/exec.js
@@ -18,4 +18,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/input.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/input.js
index e6b8583a0b..25b5cb653b 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/input.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/input.js
@@ -18,4 +18,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/output.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/output.js
index 237547f2f9..50f327ba01 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/output.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-class-super-property-in-key/output.js
@@ -51,4 +51,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/exec.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/exec.js
index 2140b943f9..4569dbb45e 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/exec.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/exec.js
@@ -21,4 +21,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/input.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/input.js
index 2140b943f9..4569dbb45e 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/input.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/input.js
@@ -21,4 +21,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/output.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/output.js
index 362b5cc2d4..d540908b48 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/output.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-call-in-key/output.js
@@ -31,4 +31,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/exec.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/exec.js
index 0587f1b0f8..5064cce138 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/exec.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/exec.js
@@ -18,4 +18,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/input.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/input.js
index 0587f1b0f8..5064cce138 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/input.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/input.js
@@ -18,4 +18,4 @@ class Outer extends Hello {
   }
 }
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/output.js b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/output.js
index 1afb4897da..38f1038862 100644
--- a/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/output.js
+++ b/packages/babel-plugin-transform-classes/test/fixtures/spec/nested-object-super-property-in-key/output.js
@@ -38,4 +38,4 @@ function (_Hello) {
   return Outer;
 }(Hello);
 
-assert.equal(new Outer().hello(), 'hello');
+expect(new Outer().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/exec.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/exec.js
index f3eef218ab..693a74ca33 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/exec.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/exec.js
@@ -18,4 +18,4 @@ const Outer = {
 };
 Object.setPrototypeOf(Outer, Hello);
 
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/input.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/input.js
index f3eef218ab..693a74ca33 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/input.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/input.js
@@ -18,4 +18,4 @@ const Outer = {
 };
 Object.setPrototypeOf(Outer, Hello);
 
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/output.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/output.js
index 1696ec25b1..db7d6c29ea 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/output.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-class-super-property-in-key/output.js
@@ -20,4 +20,4 @@ const Outer = _obj = {
   }
 };
 Object.setPrototypeOf(Outer, Hello);
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/exec.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/exec.js
index 632490b242..bd4685b712 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/exec.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/exec.js
@@ -18,4 +18,4 @@ const Outer = {
 };
 Object.setPrototypeOf(Outer, Hello);
 
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/input.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/input.js
index 632490b242..bd4685b712 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/input.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/input.js
@@ -18,4 +18,4 @@ const Outer = {
 };
 Object.setPrototypeOf(Outer, Hello);
 
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/output.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/output.js
index c843f1582d..b728c9c1f6 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/output.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/nested-object-super-property-in-key/output.js
@@ -18,4 +18,4 @@ const Outer = _obj = {
   }
 };
 Object.setPrototypeOf(Outer, Hello);
-assert.equal(Outer.constructor().hello(), 'hello');
+expect(Outer.constructor().hello()).toBe('hello');
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/exec.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/exec.js
index 000e2910e5..f3a2aeb9c0 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/exec.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/exec.js
@@ -9,6 +9,6 @@ var obj = {
 };
 Object.setPrototypeOf(obj, Base);
 
-assert.strictEqual(obj.bar(), 1);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(1);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/input.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/input.js
index 000e2910e5..f3a2aeb9c0 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/input.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/input.js
@@ -9,6 +9,6 @@ var obj = {
 };
 Object.setPrototypeOf(obj, Base);
 
-assert.strictEqual(obj.bar(), 1);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(1);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/output.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/output.js
index e0a624ee19..5a20e2f846 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/output.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-postfix/output.js
@@ -11,6 +11,6 @@ var obj = _obj = {
   }
 };
 Object.setPrototypeOf(obj, Base);
-assert.strictEqual(obj.bar(), 1);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(1);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/exec.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/exec.js
index 723f0eecda..e333ca5692 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/exec.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/exec.js
@@ -9,6 +9,6 @@ var obj = {
 };
 Object.setPrototypeOf(obj, Base);
 
-assert.strictEqual(obj.bar(), 2);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(2);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/input.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/input.js
index 723f0eecda..e333ca5692 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/input.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/input.js
@@ -9,6 +9,6 @@ var obj = {
 };
 Object.setPrototypeOf(obj, Base);
 
-assert.strictEqual(obj.bar(), 2);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(2);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);
diff --git a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/output.js b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/output.js
index ecaa02b050..89ed7a4c8f 100644
--- a/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/output.js
+++ b/packages/babel-plugin-transform-object-super/test/fixtures/object-super/super-increment-prefix/output.js
@@ -11,6 +11,6 @@ var obj = _obj = {
   }
 };
 Object.setPrototypeOf(obj, Base);
-assert.strictEqual(obj.bar(), 2);
-assert.strictEqual(Base.test, '1');
-assert.strictEqual(obj.test, 2);
+expect(obj.bar()).toBe(2);
+expect(Base.test).toBe('1');
+expect(obj.test).toBe(2);