Add test

Makefile

@@ -0,0 +1,4 @@
+test:
+	bash tests/yml-to-json-test.sh
+
+.PHONY: test

tests/composer-expected.json

@@ -0,0 +1,7 @@
+{
+    "name": "foo/bar",
+    "description": "The foobar.",
+    "require": {
+        "baz/qux": "1.0.*@dev"
+    }
+}

tests/composer.yml

@@ -0,0 +1,4 @@
+name: foo/bar
+description: The foobar.
+require:
+    baz/qux: 1.0.*@dev

tests/yml-to-json-test.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+function startTests {
+    echo "PlaygroundUnit 0.0.1 by Igor Wiedler."
+    echo
+}
+
+function endTests {
+    echo
+    echo
+}
+
+function assertEquals {
+    if [ "$1" = "$2" ]; then
+        echo -n .
+    else
+        echo "Assertion failed:"
+        echo "--- Expected"
+        echo "+++ Actual"
+        echo "- $1"
+        echo "+ $2"
+
+        endTests
+        exit 1
+    fi
+}
+
+function assertContentsEquals {
+    diff="$(diff -u $1 $2)"
+
+    if [ "$diff" = "" ]; then
+        echo -n .
+    else
+        echo "Assertion failed:"
+        echo "$diff"
+
+        endTests
+        exit 1
+    fi
+}
+
+startTests
+
+touch tests/composer-actual.json
+bin/composer-yaml convert tests/composer.yml tests/composer-actual.json
+assertContentsEquals tests/composer-expected.json tests/composer-actual.json
+rm tests/composer-actual.json
+
+endTests