JSON parser tests

Sources/Conf/Parser.swift

@@ -1,7 +1,9 @@
 import Foundation
 
 /// Namespace for the predefined parsers
-enum Parser {
+enum Parser { }
+
+extension Parser {
     static let json: CommonConfigurationProvider.Parser = { data in
         let object: Any
         do {
@@ -16,3 +18,15 @@ enum Parser {
         return values
     }
 }
+
+extension Parser {
+    static let donEnv: CommonConfigurationProvider.Parser = { data in
+        func fail() throws {
+            struct InvalidDotEnvFormat: Error { let data: Data }
+            throw InvalidDotEnvFormat(data: data)
+        }
+        try fail()
+        let result = [String: String]()
+        return result
+    }
+}

Tests/ConfTests/CommonConfigurationProviderTests.swift

@@ -87,7 +87,7 @@ final class CommonConfigurationProviderTests: XCTestCase {
         XCTAssertEqual(configuration, expect)
     }
 
-    func testNestedValues() throws {
+    func testDecodeNestedValues() throws {
         let fetcher: CommonConfigurationProvider.Fetcher = { Data() }
         let parser: CommonConfigurationProvider.Parser = { _ in
             return [
@@ -106,4 +106,20 @@ final class CommonConfigurationProviderTests: XCTestCase {
         ]
         XCTAssertEqual(configuration, expect)
     }
+
+    func testDecodeEmptyValues() throws {
+        let fetcher: CommonConfigurationProvider.Fetcher = { Data() }
+        let parser: CommonConfigurationProvider.Parser = { _ in [:] }
+        let provider = CommonConfigurationProvider(loader: fetcher, parser: parser)
+        let configuration = try provider.configuration()
+        XCTAssertEqual(configuration, [:])
+    }
+
+    func testDecodeEmptyArray() throws {
+        let fetcher: CommonConfigurationProvider.Fetcher = { Data() }
+        let parser: CommonConfigurationProvider.Parser = { _ in [ "key": []] }
+        let provider = CommonConfigurationProvider(loader: fetcher, parser: parser)
+        let configuration = try provider.configuration()
+        XCTAssertEqual(configuration, [:])
+    }
 }

Tests/ConfTests/ParserJSONTests.swift

@@ -0,0 +1,19 @@
+import XCTest
+@testable import Conf
+
+final class ParserJSONTests: XCTestCase {
+    func testSuccess() throws {
+        let content = try Resource(name: "valid", type: "json").data()
+        _ = try Parser.json(content)
+    }
+
+    func testError() throws {
+        let content = try Resource(name: "invalid", type: "json").data()
+        XCTAssertThrowsError(try Parser.json(content)) { error in
+            guard case ConfigurationError.parse = error else {
+                XCTFail("Invalid error returned \(error)")
+                return
+            }
+        }
+    }
+}

Tests/Resources/invalid.json

@@ -0,0 +1 @@
+[1, 2, 3]

Tests/Resources/valid.json

@@ -0,0 +1,11 @@
+{
+    "param": "value",
+    "nested": {
+        "key": "values"
+    },
+    "array": [
+        1,
+        2,
+        3
+    ]
+}