fix: allow a float type as a substitution value in transactional templates

lib/mail/Substitution.php

@@ -51,7 +51,7 @@ public function __construct($key = null, $value = null)
     public function setKey($key)
     {
         if (!is_string($key)) {
-            throw new TypeException('$key must be of type string.');
+            throw new TypeException("The key '$key' must be of type string.");
         }
         $this->key = (string) $key;
     }
@@ -69,15 +69,15 @@ public function getKey()
     /**
      * Add the value on a Substitution object
      *
-     * @param string|array|bool|int $value Substitution value
+     * @param string|array|object|bool|int|float $value Substitution value
      *
      * @throws \SendGrid\Mail\TypeException
      * @return null
      */
     public function setValue($value)
     {
-        if (!is_string($value) && !is_array($value) && !is_object($value) &&!is_bool($value) &&!is_int($value)) {
-            throw new TypeException('$value must be of type string, array or object.');
+        if (!is_string($value) && !is_array($value) && !is_object($value) && !is_bool($value) && !is_numeric($value)) {
+            throw new TypeException("The value '$value' must be of type string, array, object, bool, int, or float.");
         }
         $this->value = $value;
     }

test/unit/SubstitutionTest.php

@@ -0,0 +1,37 @@
+<?php
+namespace SendGrid\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use SendGrid\Mail\Substitution;
+
+/**
+ * This file tests Substitutions.
+ *
+ * @package SendGrid\Tests\Unit
+ */
+class SubstitutionTest extends TestCase
+{
+    public function testSubstitutionSetValue() 
+    {
+        $substitution = new Substitution();
+        $testString = 'Twilio SendGrid is awesome!';
+        $testArray = ['one', 'two', 'three'];
+        $testObject = (object) array('1' => 'foo');
+        $testNumberInt = 1;
+        $testNumberFloat = 1.0;
+        $testInvalidInput = null;
+
+        $substitution->setValue($testString);
+        $this->assertEquals($substitution->getValue(), $testString);
+        $substitution->setValue($testArray);
+        $this->assertEquals($substitution->getValue(), $testArray);
+        $substitution->setValue($testObject);
+        $this->assertEquals($substitution->getValue(), $testObject);
+        $substitution->setValue($testNumberInt);
+        $this->assertEquals($substitution->getValue(), $testNumberInt);
+        $substitution->setValue($testNumberFloat);
+        $this->assertEquals($substitution->getValue(), $testNumberFloat);
+        $this->expectException('SendGrid\Mail\TypeException');
+        $substitution->setValue($testInvalidInput);
+    }
+}