diff --git a/src/Expectation.php b/src/Expectation.php
index 2afe4088..db123468 100644
--- a/src/Expectation.php
+++ b/src/Expectation.php
@@ -52,6 +52,347 @@ final class Expectation
         return $this;
     }
 
+    /**
+     * Assert the value is empty.
+     */
+    public function toBeEmpty(): Expectation
+    {
+        Assert::assertEmpty($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert the value is false.
+     */
+    public function toBeFalse(): Expectation
+    {
+        Assert::assertFalse($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert the value is greater than expected one.
+     *
+     * @param int|float $value
+     */
+    public function toBeGreaterThan($value): Expectation
+    {
+        Assert::assertGreaterThan($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that value is greater than or equal to the expected one.
+     *
+     * @param int|float $value
+     */
+    public function toBeGreaterThanOrEqual($value): Expectation
+    {
+        Assert::assertGreaterThanOrEqual($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that value is less than or equal to the expected one.
+     *
+     * @param int|float $value
+     */
+    public function toBeLessThan($value): Expectation
+    {
+        Assert::assertLessThan($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that value is less than the expected one.
+     *
+     * @param int|float $value
+     */
+    public function toBeLessThanOrEqual($value): Expectation
+    {
+        Assert::assertLessThanOrEqual($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that needles is an element of value.
+     *
+     * @param mixed $needle
+     */
+    public function toContain($needle): Expectation
+    {
+        Assert::assertContains($needle, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert the value contains only variables of type.
+     *
+     * @param mixed $type
+     */
+    public function toContainOnly($type): Expectation
+    {
+        Assert::assertContainsOnly($type, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert the value contains only instances of $instance.
+     */
+    public function toContainOnlyInstancesOf(string $instance): Expectation
+    {
+        Assert::assertContainsOnlyInstancesOf($instance, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that needles is a substring of value.
+     */
+    public function toContainString(string $needle): Expectation
+    {
+        Assert::assertStringContainsString($needle, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that needles is a substring of value, ignoring the
+     * difference in casing.
+     */
+    public function toContainStringIgnoringCase(string $needle): Expectation
+    {
+        Assert::assertStringContainsStringIgnoringCase($needle, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that $count matches the number of elements of $value.
+     */
+    public function toCount(int $count): Expectation
+    {
+        Assert::assertCount($count, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Asserts that two variables have the same value.
+     *
+     * @param mixed $value
+     */
+    public function toEqual($value): Expectation
+    {
+        Assert::assertEquals($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Asserts that two variables are equals, ignoring the casing
+     * for the comparison.
+     *
+     * @param mixed $value
+     */
+    public function toEqualIgnoringCase($value): Expectation
+    {
+        Assert::assertEqualsIgnoringCase($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Asserts that two variables have the same value.
+     * The contents of $expected and $actual are canonicalized before
+     * they are compared. For instance, when the two variables $value and
+     * $this->value are arrays, then these arrays are sorted before they are
+     * compared. When $value and $this->value are objects,
+     * each object is converted to an array containing all private,
+     * protected and public attributes.
+     *
+     * @param mixed $value
+     */
+    public function toEqualCanonicalizing($value): Expectation
+    {
+        Assert::assertEqualsCanonicalizing($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the absolute difference between $value and $this->value
+     * is greater than $delta.
+     *
+     * @param mixed $value
+     */
+    public function toEqualWithDelta($value, float $delta): Expectation
+    {
+        Assert::assertEqualsWithDelta($value, $this->value, $delta);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value infinite.
+     */
+    public function toBeInfinite(): Expectation
+    {
+        Assert::assertInfinite($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is an instance of $value.
+     *
+     * @param mixed $value
+     */
+    public function toBeInstanceOf($value): Expectation
+    {
+        Assert::assertInstanceOf($value, $this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is an array.
+     */
+    public function toBeArray(): Expectation
+    {
+        Assert::assertIsArray($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is of type bool.
+     */
+    public function toBeBool(): Expectation
+    {
+        Assert::assertIsBool($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is of type callable.
+     */
+    public function toBeCallable(): Expectation
+    {
+        Assert::assertIsCallable($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of float.
+     */
+    public function toBeFloat(): Expectation
+    {
+        Assert::assertIsFloat($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of int.
+     */
+    public function toBeInt(): Expectation
+    {
+        Assert::assertIsInt($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of iterable.
+     */
+    public function toBeIterable(): Expectation
+    {
+        Assert::assertIsIterable($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of numeric.
+     */
+    public function toBeNumeric(): Expectation
+    {
+        Assert::assertIsNumeric($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of object.
+     */
+    public function toBeObject(): Expectation
+    {
+        Assert::assertIsObject($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of resource.
+     */
+    public function toBeResource(): Expectation
+    {
+        Assert::assertIsResource($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of scalar.
+     */
+    public function toBeScalar(): Expectation
+    {
+        Assert::assertIsScalar($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is type of string.
+     */
+    public function toBeString(): Expectation
+    {
+        Assert::assertIsString($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is NAN.
+     */
+    public function toBeNan(): Expectation
+    {
+        Assert::assertNan($this->value);
+
+        return $this;
+    }
+
+    /**
+     * Assert that the value is NAN.
+     */
+    public function toBeNull(): Expectation
+    {
+        Assert::assertNull($this->value);
+
+        return $this;
+    }
+
     /**
      * Dynamically calls methods on the class without any arguments.
      *
diff --git a/tests/.snapshots/success.txt b/tests/.snapshots/success.txt
index bcff1d84..916c0d6c 100644
--- a/tests/.snapshots/success.txt
+++ b/tests/.snapshots/success.txt
@@ -2,9 +2,164 @@
    PASS  Tests\CustomTestCase\ExecutedTest
   ✓ that gets executed
 
-   PASS  Tests\Expect\ToBe
+   PASS  Tests\Expect\toBe
   ✓ strict comparisons
   ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeArray
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeBool
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeCallable
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeEmpty
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeFalse
+  ✓ strict comparisons
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeFloat
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeGreatherThan
+  ✓ passes
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeGreatherThanOrEqual
+  ✓ passes
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeInfinite
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeInstanceOf
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeInt
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeIterable
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeLessThan
+  ✓ passes
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeLessThanOrEqual
+  ✓ passes
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeNAN
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeNull
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeNumeric
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeObject
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeResource
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeScalar
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toBeString
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toContain
+  ✓ passes
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toContainOnly
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toContainOnlyInstancesOf
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toContainString
+  ✓ is case sensitive
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toContainStringIgnoringCase
+  ✓ ignore difference in casing
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toCount
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toEqual
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toEqualCanonicalizing
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toEqualIgnoringCase
+  ✓ pass
+  ✓ failures
+  ✓ not failures
+
+   PASS  Tests\Expect\toEqualWithDelta
+  ✓ pass
+  ✓ failures
   ✓ not failures
 
    PASS  Tests\Features\AfterAll
@@ -172,5 +327,5 @@
    WARN  Tests\Visual\Success
   - visual snapshot of test suite on success
 
-  Tests:  6 skipped, 99 passed
-  Time:   3.62s
+  Tests:  6 skipped, 192 passed
+  Time:   5.20s
diff --git a/tests/Expect/ToBe.php b/tests/Expect/toBe.php
similarity index 100%
rename from tests/Expect/ToBe.php
rename to tests/Expect/toBe.php
diff --git a/tests/Expect/toBeArray.php b/tests/Expect/toBeArray.php
new file mode 100644
index 00000000..3fcec231
--- /dev/null
+++ b/tests/Expect/toBeArray.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect([1, 2, 3])->toBeArray();
+    expect('1, 2, 3')->not->toBeArray();
+});
+
+test('failures', function () {
+    expect(null)->toBeArray();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(['a', 'b', 'c'])->not->toBeArray();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeBool.php b/tests/Expect/toBeBool.php
new file mode 100644
index 00000000..5dc37b21
--- /dev/null
+++ b/tests/Expect/toBeBool.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(true)->toBeBool();
+    expect(0)->not->toBeBool();
+});
+
+test('failures', function () {
+    expect(null)->toBeBool();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(false)->not->toBeBool();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeCallable.php b/tests/Expect/toBeCallable.php
new file mode 100644
index 00000000..2bd8f139
--- /dev/null
+++ b/tests/Expect/toBeCallable.php
@@ -0,0 +1,18 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(function () {})->toBeCallable();
+    expect(null)->not->toBeCallable();
+});
+
+test('failures', function () {
+    $hello = 5;
+
+    expect($hello)->toBeCallable();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(function () { return 42; })->not->toBeCallable();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeEmpty.php b/tests/Expect/toBeEmpty.php
new file mode 100644
index 00000000..05e5180a
--- /dev/null
+++ b/tests/Expect/toBeEmpty.php
@@ -0,0 +1,18 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect([])->toBeEmpty();
+    expect(null)->toBeEmpty();
+});
+
+test('failures', function () {
+    expect([1, 2])->toBeEmpty();
+    expect(' ')->toBeEmpty();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect([])->not->toBeEmpty();
+    expect(null)->not->toBeEmpty();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeFalse.php b/tests/Expect/toBeFalse.php
new file mode 100644
index 00000000..1371c86e
--- /dev/null
+++ b/tests/Expect/toBeFalse.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('strict comparisons', function () {
+    expect(false)->toBeFalse();
+});
+
+test('failures', function () {
+    expect('')->toBeFalse();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(false)->not->toBe(false);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeFloat.php b/tests/Expect/toBeFloat.php
new file mode 100644
index 00000000..69aa2306
--- /dev/null
+++ b/tests/Expect/toBeFloat.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(1.0)->toBeFloat();
+    expect(1)->not->toBeFloat();
+});
+
+test('failures', function () {
+    expect(42)->toBeFloat();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(log(3))->not->toBeFloat();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeGreatherThan.php b/tests/Expect/toBeGreatherThan.php
new file mode 100644
index 00000000..ed840ed6
--- /dev/null
+++ b/tests/Expect/toBeGreatherThan.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('passes', function () {
+    expect(42)->toBeGreaterThan(41);
+    expect(4)->toBeGreaterThan(3.9);
+});
+
+test('failures', function () {
+    expect(4)->toBeGreaterThan(4);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(5)->not->toBeGreaterThan(4);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeGreatherThanOrEqual.php b/tests/Expect/toBeGreatherThanOrEqual.php
new file mode 100644
index 00000000..3b1cd029
--- /dev/null
+++ b/tests/Expect/toBeGreatherThanOrEqual.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('passes', function () {
+    expect(42)->toBeGreaterThanOrEqual(41);
+    expect(4)->toBeGreaterThanOrEqual(4);
+});
+
+test('failures', function () {
+    expect(4)->toBeGreaterThanOrEqual(4.1);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(5)->not->toBeGreaterThanOrEqual(5);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeInfinite.php b/tests/Expect/toBeInfinite.php
new file mode 100644
index 00000000..ebcb0a36
--- /dev/null
+++ b/tests/Expect/toBeInfinite.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(log(0))->toBeInfinite();
+    expect(log(1))->not->toBeInfinite();
+});
+
+test('failures', function () {
+    expect(asin(2))->toBeInfinite();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(INF)->not->toBeInfinite();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeInstanceOf.php b/tests/Expect/toBeInstanceOf.php
new file mode 100644
index 00000000..03b3e881
--- /dev/null
+++ b/tests/Expect/toBeInstanceOf.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(new Exception())->toBeInstanceOf(Exception::class);
+    expect(new Exception())->not->toBeInstanceOf(RuntimeException::class);
+});
+
+test('failures', function () {
+    expect(new Exception())->toBeInstanceOf(RuntimeException::class);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(new Exception())->not->toBeInstanceOf(Exception::class);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeInt.php b/tests/Expect/toBeInt.php
new file mode 100644
index 00000000..9eb1b3db
--- /dev/null
+++ b/tests/Expect/toBeInt.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(42)->toBeInt();
+    expect(42.0)->not->toBeInt();
+});
+
+test('failures', function () {
+    expect(42.0)->toBeInt();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(6 * 7)->not->toBeInt();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeIterable.php b/tests/Expect/toBeIterable.php
new file mode 100644
index 00000000..fca23688
--- /dev/null
+++ b/tests/Expect/toBeIterable.php
@@ -0,0 +1,23 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect([])->toBeIterable();
+    expect(null)->not->toBeIterable();
+});
+
+test('failures', function () {
+    expect(42)->toBeIterable();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    function gen(): iterable
+    {
+        yield 1;
+        yield 2;
+        yield 3;
+    }
+
+    expect(gen())->not->toBeIterable();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeLessThan.php b/tests/Expect/toBeLessThan.php
new file mode 100644
index 00000000..08db8545
--- /dev/null
+++ b/tests/Expect/toBeLessThan.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('passes', function () {
+    expect(41)->toBeLessThan(42);
+    expect(4)->toBeLessThan(5);
+});
+
+test('failures', function () {
+    expect(4)->toBeLessThan(4);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(5)->not->toBeLessThan(6);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeLessThanOrEqual.php b/tests/Expect/toBeLessThanOrEqual.php
new file mode 100644
index 00000000..c9f00577
--- /dev/null
+++ b/tests/Expect/toBeLessThanOrEqual.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('passes', function () {
+    expect(41)->toBeLessThanOrEqual(42);
+    expect(4)->toBeLessThanOrEqual(4);
+});
+
+test('failures', function () {
+    expect(4)->toBeLessThanOrEqual(3.9);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(5)->not->toBeLessThanOrEqual(5);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeNAN.php b/tests/Expect/toBeNAN.php
new file mode 100644
index 00000000..0767f1ad
--- /dev/null
+++ b/tests/Expect/toBeNAN.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(asin(2))->toBeNan();
+    expect(log(0))->not->toBeNan();
+});
+
+test('failures', function () {
+    expect(1)->toBeNan();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(acos(1.5))->not->toBeNan();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeNull.php b/tests/Expect/toBeNull.php
new file mode 100644
index 00000000..2bd7d987
--- /dev/null
+++ b/tests/Expect/toBeNull.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(null)->toBeNull();
+    expect('')->not->toBeNull();
+});
+
+test('failures', function () {
+    expect('hello')->toBeNull();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(null)->not->toBeNull();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeNumeric.php b/tests/Expect/toBeNumeric.php
new file mode 100644
index 00000000..710ca236
--- /dev/null
+++ b/tests/Expect/toBeNumeric.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(42)->toBeNumeric();
+    expect('A')->not->toBeNumeric();
+});
+
+test('failures', function () {
+    expect(null)->toBeNumeric();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(6 * 7)->not->toBeNumeric();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeObject.php b/tests/Expect/toBeObject.php
new file mode 100644
index 00000000..e227b4cb
--- /dev/null
+++ b/tests/Expect/toBeObject.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect((object) ['a' => 1])->toBeObject();
+    expect(['a' => 1])->not->toBeObject();
+});
+
+test('failures', function () {
+    expect(null)->toBeObject();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect((object) 'ciao')->not->toBeObject();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeResource.php b/tests/Expect/toBeResource.php
new file mode 100644
index 00000000..575fabe3
--- /dev/null
+++ b/tests/Expect/toBeResource.php
@@ -0,0 +1,22 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+$resource = tmpfile();
+
+afterAll(function () use ($resource) {
+    fclose($resource);
+});
+
+test('pass', function () use ($resource) {
+    expect($resource)->toBeResource();
+    expect(null)->not->toBeResource();
+});
+
+test('failures', function () {
+    expect(null)->toBeResource();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () use ($resource) {
+    expect($resource)->not->toBeResource();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeScalar.php b/tests/Expect/toBeScalar.php
new file mode 100644
index 00000000..236c0e0b
--- /dev/null
+++ b/tests/Expect/toBeScalar.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(1.1)->toBeScalar();
+});
+
+test('failures', function () {
+    expect(null)->toBeScalar();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(42)->not->toBeScalar();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toBeString.php b/tests/Expect/toBeString.php
new file mode 100644
index 00000000..91c31881
--- /dev/null
+++ b/tests/Expect/toBeString.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('1.1')->toBeString();
+    expect(1.1)->not->toBeString();
+});
+
+test('failures', function () {
+    expect(null)->toBeString();
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('42')->not->toBeString();
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toContain.php b/tests/Expect/toContain.php
new file mode 100644
index 00000000..ce477fbf
--- /dev/null
+++ b/tests/Expect/toContain.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('passes', function () {
+    expect([1, 2, 42])->toContain(42);
+});
+
+test('failures', function () {
+    expect([1, 2, 42])->toContain(3);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect([1, 2, 42])->not->toContain(42);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toContainOnly.php b/tests/Expect/toContainOnly.php
new file mode 100644
index 00000000..2e9fecfe
--- /dev/null
+++ b/tests/Expect/toContainOnly.php
@@ -0,0 +1,17 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect([1, 2, 3])->toContainOnly('int');
+    expect(['hello', 'world'])->toContainOnly('string');
+});
+
+test('failures', function () {
+    expect([1, 2, '3'])->toContainOnly('string');
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect([1, 2, 3])->not->toContainOnly('int');
+    expect(['hello', 'world'])->not->toContainOnly('string');
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toContainOnlyInstancesOf.php b/tests/Expect/toContainOnlyInstancesOf.php
new file mode 100644
index 00000000..fdda161b
--- /dev/null
+++ b/tests/Expect/toContainOnlyInstancesOf.php
@@ -0,0 +1,23 @@
+<?php
+
+use Pest\Actions\AddsTests;
+use Pest\Expectation;
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    $expected = [new Expectation('whatever')];
+
+    expect($expected)->toContainOnlyInstancesOf(Expectation::class);
+});
+
+test('failures', function () {
+    $expected = [new Expectation('whatever')];
+
+    expect($expected)->toContainOnlyInstancesOf(AddsTests::class);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    $expected = [new Expectation('whatever')];
+
+    expect($expected)->not->toContainOnlyInstancesOf(Expectation::class);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toContainString.php b/tests/Expect/toContainString.php
new file mode 100644
index 00000000..03f55b69
--- /dev/null
+++ b/tests/Expect/toContainString.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('is case sensitive', function () {
+    expect('hello world')->toContainString('world');
+    expect('hello world')->not->toContainString('World');
+});
+
+test('failures', function () {
+    expect('hello world')->toContainString('Hello');
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('hello world')->not->toContainString('hello');
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toContainStringIgnoringCase.php b/tests/Expect/toContainStringIgnoringCase.php
new file mode 100644
index 00000000..fc5e1081
--- /dev/null
+++ b/tests/Expect/toContainStringIgnoringCase.php
@@ -0,0 +1,17 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('ignore difference in casing', function () {
+    expect('hello world')->toContainStringIgnoringCase('world');
+    expect('hello world')->toContainStringIgnoringCase('World');
+});
+
+test('failures', function () {
+    expect('hello world')->toContainStringIgnoringCase('hi');
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('hello world')->not->toContainStringIgnoringCase('Hello');
+    expect('hello world')->not->toContainStringIgnoringCase('hello');
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toCount.php b/tests/Expect/toCount.php
new file mode 100644
index 00000000..6e8d5fcd
--- /dev/null
+++ b/tests/Expect/toCount.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect([1, 2, 3])->toCount(3);
+});
+
+test('failures', function () {
+    expect([1, 2, 3])->toCount(4);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect([1, 2, 3])->not->toCount(3);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toEqual.php b/tests/Expect/toEqual.php
new file mode 100644
index 00000000..de0b7e50
--- /dev/null
+++ b/tests/Expect/toEqual.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('00123')->toEqual(123);
+});
+
+test('failures', function () {
+    expect(['a', 'b', 'c'])->toEqual(['a', 'b']);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('042')->not->toEqual(42);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toEqualCanonicalizing.php b/tests/Expect/toEqualCanonicalizing.php
new file mode 100644
index 00000000..2d6c299f
--- /dev/null
+++ b/tests/Expect/toEqualCanonicalizing.php
@@ -0,0 +1,16 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('00123')->toEqualCanonicalizing(123);
+    expect(['a', 'b', 'c'])->toEqualCanonicalizing(['c', 'a', 'b']);
+});
+
+test('failures', function () {
+    expect(['a', 'b', 'c'])->toEqualCanonicalizing(['a', 'b']);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('042')->not->toEqualCanonicalizing(42);
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toEqualIgnoringCase.php b/tests/Expect/toEqualIgnoringCase.php
new file mode 100644
index 00000000..2016fa4d
--- /dev/null
+++ b/tests/Expect/toEqualIgnoringCase.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect('hello')->toEqualIgnoringCase('HELLO');
+});
+
+test('failures', function () {
+    expect('hello')->toEqualIgnoringCase('BAR');
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect('HELLO')->not->toEqualIgnoringCase('HelLo');
+})->throws(ExpectationFailedException::class);
diff --git a/tests/Expect/toEqualWithDelta.php b/tests/Expect/toEqualWithDelta.php
new file mode 100644
index 00000000..bb78b86d
--- /dev/null
+++ b/tests/Expect/toEqualWithDelta.php
@@ -0,0 +1,15 @@
+<?php
+
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('pass', function () {
+    expect(1.0)->toEqualWithDelta(1.3, .4);
+});
+
+test('failures', function () {
+    expect(1.0)->toEqualWithDelta(1.5, .1);
+})->throws(ExpectationFailedException::class);
+
+test('not failures', function () {
+    expect(1.0)->not->toEqualWithDelta(1.6, .7);
+})->throws(ExpectationFailedException::class);