#57 Support environment variables

Author: YevgeniyShunevych

src/Atata.Configuration.Json.Tests/Configs/EnvironmentVariables.json

@@ -1,3 +1,3 @@
 {
-  "baseUrl": "{env:baseurl}"
+  "baseUrl": "{env:url_prefix}/{env:url_suffix}"
 }

src/Atata.Configuration.Json.Tests/EnvironmentVariableTests.cs

@@ -6,24 +6,26 @@ namespace Atata.Configuration.Json.Tests
 {
     public class EnvironmentVariableTests : TestFixture
     {
-        private const string VariableName = "baseurl";
+        private const string Variable1Name = "url_prefix";
+
+        private const string Variable2Name = "url_suffix";
 
         [SetUp]
         public void SetUp()
         {
-            Environment.SetEnvironmentVariable(VariableName, null);
+            Environment.SetEnvironmentVariable(Variable1Name, null);
         }
 
         [Test]
         public void Found()
         {
-            string variableValue = "https://example.org/";
-            Environment.SetEnvironmentVariable(VariableName, variableValue, EnvironmentVariableTarget.Process);
+            Environment.SetEnvironmentVariable(Variable1Name, "https://example.org", EnvironmentVariableTarget.Process);
+            Environment.SetEnvironmentVariable(Variable2Name, "test", EnvironmentVariableTarget.Process);
 
             AtataContextBuilder builder = AtataContext.Configure()
                 .ApplyJsonConfig("Configs/EnvironmentVariables");
 
-            builder.BuildingContext.BaseUrl.Should().Be(variableValue);
+            builder.BuildingContext.BaseUrl.Should().Be("https://example.org/test");
         }
 
         [Test]
@@ -34,7 +36,7 @@ public void NotFound()
             var exception = Assert.Throws<ConfigurationException>(() =>
                 builder.ApplyJsonConfig("Configs/EnvironmentVariables"));
 
-            exception.Message.Should().Contain(VariableName);
+            exception.Message.Should().Contain(Variable1Name);
         }
     }
 }

src/Atata.Configuration.Json/JsonConfigFile.cs

@@ -62,7 +62,7 @@ public static string ReadText(string filePath = null, string environmentAlias =
 
         private static string ProcessJsonText(string jsonText)
         {
-            Regex regex = new Regex(@"{env:.+}");
+            Regex regex = new Regex(@"{env:\D[^}]*}");
 
             return regex.Replace(jsonText, match =>
             {