IHF: Initial is_json tests added.

Author: dmitry-ivanov

tests/IsJsonTest.php

@@ -0,0 +1,65 @@
+<?php
+
+class IsJsonTest extends TestCase
+{
+    /** @test */
+    public function it_returns_false_with_null_passed()
+    {
+        $this->assertFalse(is_json(null));
+    }
+
+    /** @test */
+    public function it_returns_false_with_boolean_true_passed()
+    {
+        $this->assertFalse(is_json(true));
+    }
+
+    /** @test */
+    public function it_returns_false_with_boolean_false_passed()
+    {
+        $this->assertFalse(is_json(false));
+    }
+
+    /** @test */
+    public function it_returns_false_with_integer_passed()
+    {
+        $this->assertFalse(is_json(123));
+    }
+
+    /** @test */
+    public function it_returns_false_with_float_passed()
+    {
+        $this->assertFalse(is_json(123.45));
+    }
+
+    /** @test */
+    public function it_returns_false_with_empty_array_passed()
+    {
+        $this->assertFalse(is_json([]));
+    }
+
+    /** @test */
+    public function it_returns_false_with_non_empty_array_passed()
+    {
+        $this->assertFalse(is_json(['foo' => 'bar']));
+    }
+
+    /** @test */
+    public function it_returns_false_with_an_empty_string_passed()
+    {
+        $this->assertFalse(is_json(''));
+    }
+
+    /** @test */
+    public function it_returns_false_with_non_json_string_passed()
+    {
+        $this->assertFalse(is_json('non-json string'));
+    }
+
+    /** @test */
+    public function it_returns_true_with_json_string_passed()
+    {
+        $json = json_encode(['foo' => 'bar']);
+        $this->assertTrue(is_json($json));
+    }
+}