diff --git a/Sources/XcodeGenKit/Spec/SpecError.swift b/Sources/XcodeGenKit/Spec/SpecError.swift
index 7175df68..d201ba6c 100644
--- a/Sources/XcodeGenKit/Spec/SpecError.swift
+++ b/Sources/XcodeGenKit/Spec/SpecError.swift
@@ -8,8 +8,16 @@
 
 import Foundation
 
-public enum SpecError: Error {
+public enum SpecError: Error, CustomStringConvertible {
     case unknownTargetType(String)
     case unknownTargetPlatform(String)
     case invalidDependency([String: Any])
+
+    public var description: String {
+        switch self {
+            case let .unknownTargetType(type): return "Unknown Target type: \(type)"
+            case let .unknownTargetPlatform(platform): return "Unknown Target platform: \(platform)"
+            case let .invalidDependency(dependency): return "Unknown Target dependency: \(dependency)"
+        }
+    }
 }
diff --git a/Sources/XcodeGenKit/Spec/Target.swift b/Sources/XcodeGenKit/Spec/Target.swift
index 29797e0a..fcd35680 100644
--- a/Sources/XcodeGenKit/Spec/Target.swift
+++ b/Sources/XcodeGenKit/Spec/Target.swift
@@ -68,7 +68,11 @@ extension Target: JSONObjectConvertible {
             sources = jsonDictionary.json(atKeyPath: "sources") ?? []
         }
         sourceExludes = jsonDictionary.json(atKeyPath: "sourceExludes") ?? []
-        dependencies = jsonDictionary.json(atKeyPath: "dependencies") ?? []
+        if jsonDictionary["dependencies"] == nil {
+            dependencies = []
+        } else {
+            dependencies = try jsonDictionary.json(atKeyPath: "dependencies", invalidItemBehaviour: .fail)
+        }
         prebuildScripts = jsonDictionary.json(atKeyPath: "prebuildScripts") ?? []
         postbuildScripts = jsonDictionary.json(atKeyPath: "postbuildScripts") ?? []
     }
diff --git a/Tests/XcodeGenKitTests/FixtureTests.swift b/Tests/XcodeGenKitTests/FixtureTests.swift
index 82c4fd0b..293978d1 100644
--- a/Tests/XcodeGenKitTests/FixtureTests.swift
+++ b/Tests/XcodeGenKitTests/FixtureTests.swift
@@ -1,4 +1,4 @@
-import XCTest
+import Spectre
 import PathKit
 import XcodeGenKit
 import xcodeproj
@@ -14,17 +14,16 @@ func generate(specPath: Path, projectPath: Path) throws {
         try project.write(path: projectPath, override: true)
         _ = try XcodeProj(path: projectPath)
     } else {
-        XCTFail("Spec has errors:\n\(lintedSpec.errors.map { $0.description}.joined(separator: "\n"))")
+        throw failure("Spec has errors:\n\(lintedSpec.errors.map { $0.description}.joined(separator: "\n"))")
     }
 }
 
-class FixtureTests: XCTestCase {
+func fixtureTests() {
 
-    func testGeneration() throws {
-        try generate(specPath: fixturePath + "TestProject/spec.yml", projectPath: fixturePath + "TestProject/GeneratedProject.xcodeproj")
+
+    describe("Test Project") {
+        $0.it("generates") {
+            try generate(specPath: fixturePath + "TestProject/spec.yml", projectPath: fixturePath + "TestProject/GeneratedProject.xcodeproj")
+        }
     }
-
-    static var allTests = [
-        ("testGeneration", testGeneration),
-        ]
 }
diff --git a/Tests/XcodeGenKitTests/GeneratorTests.swift b/Tests/XcodeGenKitTests/GeneratorTests.swift
index cbbeb74c..e425cffc 100644
--- a/Tests/XcodeGenKitTests/GeneratorTests.swift
+++ b/Tests/XcodeGenKitTests/GeneratorTests.swift
@@ -1,9 +1,9 @@
-import XCTest
+import Spectre
 import XcodeGenKit
 import xcodeproj
 import PathKit
 
-class GeneratorTests: XCTestCase {
+func generatorTests() {
 
     func getProject(_ spec: Spec) throws -> XcodeProj {
         let lintedSpec = SpecLinter.lint(spec)
@@ -11,12 +11,13 @@ class GeneratorTests: XCTestCase {
         return try generator.generate()
     }
 
-    func testGeneratorGeneratesDefaultConfigs() throws {
-        let project = try getProject(Spec(name: "test"))
-        XCTAssert(project.pbxproj.objects.buildConfigurations.count == 2)
-    }
+    describe("Generator") {
 
-    static var allTests = [
-        ("testGeneratorGeneratesDefaultConfigs", testGeneratorGeneratesDefaultConfigs),
-        ]
+        $0.it("provide defaults") {
+            let project = try getProject(Spec(name: "test"))
+            try expect(project.pbxproj.objects.buildConfigurations.count) == 2
+
+        }
+    }
 }
+
diff --git a/Tests/XcodeGenKitTests/SpecLoadingTests.swift b/Tests/XcodeGenKitTests/SpecLoadingTests.swift
index 5d8a11b4..69bdb4d7 100644
--- a/Tests/XcodeGenKitTests/SpecLoadingTests.swift
+++ b/Tests/XcodeGenKitTests/SpecLoadingTests.swift
@@ -1,9 +1,9 @@
-import XCTest
+import Spectre
 import PathKit
 import XcodeGenKit
 import xcodeproj
 
-class SpecLoadingTests: XCTestCase {
+func specLoadingTests() {
 
     @discardableResult
     func getSpec(_ spec: [String: Any]) throws -> Spec {
@@ -14,22 +14,34 @@ class SpecLoadingTests: XCTestCase {
         return try Spec(jsonDictionary: specDictionary)
     }
 
-    func expectSpecFailure(_ expectedError: SpecError, _ spec: [String: Any]) {
-        expectError(expectedError) {
+    func expectSpecFailure(_ expectedError: SpecError, _ spec: [String: Any]) throws {
+        try expectError(expectedError) {
             try getSpec(spec)
         }
     }
 
-    func testIncorrectTargetPlatform() throws {
-        expectSpecFailure(.unknownTargetPlatform("invalid"), ["targets": [["name": "test", "type": "application", "platform": "invalid"]]])
+    let validTarget: [String: Any] = ["name": "test", "type": "application", "platform": "iOS"]
+    let invalidName = "invalid"
+
+    describe("The project spec") {
+
+        $0.it("fails with incorrect platform") {
+            var target = validTarget
+            target["platform"] = invalidName
+            try expectSpecFailure(.unknownTargetPlatform("invalid"), ["targets": [target]])
+        }
+
+        $0.it("fails with incorrect product type") {
+            var target = validTarget
+            target["type"] = invalidName
+            try expectSpecFailure(.unknownTargetType("invalid"), ["targets": [target]])
+        }
+
+        $0.it("fails with invalid target dependency") {
+            var target = validTarget
+            target["dependencies"] = [["invalid": "target"]]
+            try expectSpecFailure(.invalidDependency(["invalid": "target"]), ["targets": [target]])
+        }
     }
 
-    func testIncorrectTargetProductType() throws {
-        expectSpecFailure(.unknownTargetType("invalid"), ["targets": [["name": "test", "type": "invalid", "platform": "iOS"]]])
-    }
-
-    static var allTests = [
-        ("testIncorrectTargetPlatform", testIncorrectTargetPlatform),
-        ("testIncorrectTargetProductType", testIncorrectTargetProductType),
-        ]
 }
diff --git a/Tests/XcodeGenKitTests/TestHelpers.swift b/Tests/XcodeGenKitTests/TestHelpers.swift
index 69f73b95..b74adf91 100644
--- a/Tests/XcodeGenKitTests/TestHelpers.swift
+++ b/Tests/XcodeGenKitTests/TestHelpers.swift
@@ -1,12 +1,14 @@
 import Foundation
-import XCTest
+import Spectre
 
-func expectError(_ expectedError: Error, closure: () throws -> ()) {
+func expectError<T: Error>(_ expectedError: T, closure: () throws -> ()) throws where T: CustomStringConvertible {
     do {
         try closure()
-        XCTFail("Supposed to fail with \"\(expectedError)\"")
+    } catch let error as T {
+        try expect(error.description) == expectedError.description
+        return
     } catch {
-        XCTAssert(error.localizedDescription == expectedError.localizedDescription,
-                  "Expected error \"\(expectedError.localizedDescription)\" but got \"\(error.localizedDescription)\"")
+        throw failure("Supposed to fail with \"\(expectedError)\"")
     }
+    throw failure("Supposed to fail with \"\(expectedError)\"")
 }
diff --git a/Tests/XcodeGenKitTests/XCTest.swift b/Tests/XcodeGenKitTests/XCTest.swift
new file mode 100644
index 00000000..fe24cf1e
--- /dev/null
+++ b/Tests/XcodeGenKitTests/XCTest.swift
@@ -0,0 +1,11 @@
+import Foundation
+import XCTest
+
+class XCodeGenKitTests: XCTestCase {
+
+    func testXcodeGenKit() {
+        generatorTests()
+        specLoadingTests()
+        fixtureTests()
+    }
+}