Add JSONCoercion to config (#31)

src/Config/JSONCoercion.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Scoutapm\Config;
+
+class JSONCoercion
+{
+    public function coerce($value)
+    {
+        if (is_string($value)) {
+            // assoc=true to create an array instead of an object
+            return json_decode($value, true);
+        }
+
+        return $value;
+    }
+}

tests/Config/BoolCoercionTest.php

@@ -0,0 +1,53 @@
+<?php
+namespace Scoutapm\Tests\Config;
+
+use \PHPUnit\Framework\TestCase;
+use \Scoutapm\Config\BoolCoercion;
+
+/**
+ * Test Case for @see \Scoutapm\Config
+ */
+final class BoolCoercionTest extends TestCase
+{
+    public function testParsesStrings()
+    {
+        $c = new BoolCoercion();
+
+        $this->assertEquals(true, $c->coerce('t'));
+        $this->assertEquals(true, $c->coerce('true'));
+        $this->assertEquals(true, $c->coerce('1'));
+        $this->assertEquals(true, $c->coerce('yes'));
+        $this->assertEquals(true, $c->coerce('YES'));
+        $this->assertEquals(true, $c->coerce('T'));
+        $this->assertEquals(true, $c->coerce('TRUE'));
+
+        // Falses
+        $this->assertEquals(false, $c->coerce('f'));
+        $this->assertEquals(false, $c->coerce('false'));
+        $this->assertEquals(false, $c->coerce('no'));
+        $this->assertEquals(false, $c->coerce('0'));
+    }
+
+    public function testIgnoresBooleans()
+    {
+        $c = new BoolCoercion();
+
+        $this->assertEquals(true, $c->coerce(true));
+        $this->assertEquals(false, $c->coerce(false));
+    }
+
+    public function testNullIsFalse()
+    {
+        $c = new BoolCoercion();
+
+        $this->assertEquals(false, $c->coerce(null));
+    }
+
+    public function testAnythingElseIsFalse()
+    {
+        $c = new BoolCoercion();
+
+        // $c is "any object"
+        $this->assertEquals(false, $c->coerce($c));
+    }
+}

tests/Config/JSONCoercionTest.php

@@ -0,0 +1,32 @@
+<?php
+namespace Scoutapm\Tests\Config;
+
+use \PHPUnit\Framework\TestCase;
+use \Scoutapm\Config\JSONCoercion;
+
+/**
+ * Test Case for @see \Scoutapm\Config
+ */
+final class JSONCoercionTest extends TestCase
+{
+    public function testParsesJSON()
+    {
+        $c = new JSONCoercion();
+        $this->assertEquals([
+            "foo" => 1
+        ], $c->coerce('{"foo": 1}'));
+    }
+
+    // Return null for any invalid JSON
+    public function testInvalidJSON()
+    {
+        $c = new JSONCoercion();
+        $this->assertEquals(null, $c->coerce('foo: 1}'));
+    }
+
+    public function testIgnoresNonString()
+    {
+        $c = new JSONCoercion();
+        $this->assertEquals(10, $c->coerce(10));
+    }
+}