diff --git a/composer.json b/composer.json
index 17d37e9..ed260d5 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,9 @@
     "autoload-dev": {
         "psr-4": {
             "Brick\\Reflection\\Tests\\": "tests/"
-        }
+        },
+        "files": [
+            "tests/functions.php"
+        ]
     }
-}
\ No newline at end of file
+}
diff --git a/tests/ImportResolverTest.php b/tests/ImportResolverTest.php
index 07a598b..a596c17 100644
--- a/tests/ImportResolverTest.php
+++ b/tests/ImportResolverTest.php
@@ -51,4 +51,45 @@ public function testAliasedImport()
         $this->assertResolve(Tools::class . '\A', 'Tools\A');
         $this->assertResolve(Tools::class . '\A\B', 'Tools\A\B');
     }
+
+    /**
+     * @expectedException        \InvalidArgumentException
+     * @expectedExceptionMessage Cannot infer the file name from the given ReflectionObject
+     */
+    public function testConstructorWithInvalidInferFileNameShouldThrowInvalidArgumentException()
+    {
+        $resolver = new ImportResolver(new \ReflectionObject(new \Exception));
+    }
+
+    public function testConstructorWithReflectionProperty()
+    {
+        $resolver = new ImportResolver(new \ReflectionProperty(ReflectionTarget::class, 'foo'));
+
+        $this->assertSame(ReflectionTarget::class, $resolver->resolve('ReflectionTarget'));
+    }
+
+    public function testConstructorWithReflectionMethod()
+    {
+        $resolver = new ImportResolver(new \ReflectionMethod(ReflectionTarget::class, 'publicStaticMethod'));
+
+        $this->assertSame(ReflectionTarget::class, $resolver->resolve('ReflectionTarget'));
+    }
+
+    public function testConstructorWithReflectionParameter()
+    {
+        $resolver = new ImportResolver(new \ReflectionParameter([
+            ReflectionTarget::class, 'privateFunc',
+        ], 'str'));
+
+        $this->assertSame(ReflectionTarget::class, $resolver->resolve('ReflectionTarget'));
+    }
+
+    /**
+     * @expectedException        \InvalidArgumentException
+     * @expectedExceptionMessage Cannot infer the declaring class from the given ReflectionFunction
+     */
+    public function testConstructorWithReflectionFunctionThrowsException()
+    {
+        $resolver = new ImportResolver(new \ReflectionFunction('Brick\Reflection\Tests\reflectedFunc'));
+    }
 }
diff --git a/tests/ReflectionTarget.php b/tests/ReflectionTarget.php
new file mode 100644
index 0000000..fadbdd7
--- /dev/null
+++ b/tests/ReflectionTarget.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Brick\Reflection\Tests;
+
+/**
+ * The Reflection Target class.
+ */
+class ReflectionTarget
+{
+    /**
+     * @param string
+     */
+    private $foo;
+
+    /**
+     * @var string $bar
+     */
+    private $bar;
+
+    /**
+     * @var \Exception $barWithType
+     */
+    private $barWithType;
+
+    public function __construct()
+    {
+        $this->foo = 'foo';
+        $this->bar = 'bar';
+    }
+
+    /**
+     * @param string $str
+     */
+    private function privateFunc(string $str)
+    {
+        return $str;
+    }
+
+    /**
+     * @return void
+     */
+    public static function publicStaticMethod() {}
+}
\ No newline at end of file
diff --git a/tests/ReflectionToolsTest.php b/tests/ReflectionToolsTest.php
index 17645e7..6b5b804 100644
--- a/tests/ReflectionToolsTest.php
+++ b/tests/ReflectionToolsTest.php
@@ -19,6 +19,80 @@ public function testGetMethodsDoesNotReturnStaticMethods()
         $this->assertCount(0, $methods);
     }
 
+    public function testGetReflectionFunction()
+    {
+        $reflectionFunc = function() {};
+        $function = (new ReflectionTools)->getReflectionFunction($reflectionFunc);
+
+        $this->assertInstanceOf(\ReflectionFunction::class, $function);
+        $this->assertSame('Brick\Reflection\Tests\{closure}', $function->getName());
+    }
+
+    public function testGetFunctionParameterTypesShouldReturnEmptyArray()
+    {
+        $types = (new ReflectionTools)->getFunctionParameterTypes(new \ReflectionFunction('Brick\Reflection\Tests\reflectedFunc'));
+
+        $this->assertSame([], $types);
+    }
+
+    public function testGetFunctionParameterTypesShouldReturnTypesArray()
+    {
+        $types = (new ReflectionTools)->getFunctionParameterTypes(new \ReflectionFunction('Brick\Reflection\Tests\reflectedParameterFunc'));
+
+        $this->assertSame(['arg' => ['string']], $types);
+    }
+
+    public function testGetParameterTypesShouldReturnTypeArray()
+    {
+        $types = (new ReflectionTools)->getParameterTypes(new \ReflectionParameter([
+            ReflectionTarget::class, 'privateFunc',
+        ], 'str'));
+
+        $this->assertSame(['string'], $types);
+    }
+
+    public function testGetPropertyTypesShouldReturnEmptyArray()
+    {
+        $types = (new ReflectionTools)->getPropertyTypes(new \ReflectionProperty(ReflectionTarget::class, 'foo'));
+
+        $this->assertCount(0, $types);
+    }
+
+    public function testGetPropertyTypesShouldReturnTypeArray()
+    {
+        $types = (new ReflectionTools)->getPropertyTypes(new \ReflectionProperty(ReflectionTarget::class, 'bar'));
+
+        $this->assertSame(['string'], $types);
+    }
+
+    public function testGetPropertyClassShouldReturnNull()
+    {
+        $propertyClass = (new ReflectionTools)->getPropertyClass(new \ReflectionProperty(ReflectionTarget::class, 'foo'));
+
+        $this->assertNull($propertyClass);
+    }
+
+    public function testGetPropertyClassShouldReturnTypeString()
+    {
+        $propertyClass = (new ReflectionTools)->getPropertyClass(new \ReflectionProperty(ReflectionTarget::class, 'barWithType'));
+
+        $this->assertSame('Exception', $propertyClass);
+    }
+
+    public function testGetFunctionNameShouldReturnClassMethodName()
+    {
+        $functionName = (new ReflectionTools)->getFunctionName(new \ReflectionMethod(ReflectionTarget::class, 'publicStaticMethod'));
+
+        $this->assertSame('Brick\Reflection\Tests\ReflectionTarget::publicStaticMethod', $functionName);
+    }
+
+    public function testGetFunctionNameShouldReturnCurrentFunctionName()
+    {
+        $functionName = (new ReflectionTools)->getFunctionName(new \ReflectionFunction('Brick\Reflection\Tests\reflectedFunc'));
+
+        $this->assertSame('Brick\Reflection\Tests\reflectedFunc', $functionName);
+    }
+
     /**
      * @return void
      */
diff --git a/tests/functions.php b/tests/functions.php
new file mode 100644
index 0000000..0d097b9
--- /dev/null
+++ b/tests/functions.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Brick\Reflection\Tests;
+
+/**
+ * The Target Reflection function without parameter.
+ */
+function reflectedFunc()
+{
+    return 'test';
+}
+
+/**
+ * The Target Reflection function with string parameter.
+ * @param string $arg
+ */
+function reflectedParameterFunc(string $arg)
+{
+    return isset($arg) ? $arg : 'test';
+}