diff --git a/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift b/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift
index 8e97eca..9cc8c2a 100644
--- a/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift	
+++ b/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift	
@@ -52,7 +52,7 @@ public struct TestFunctionName: Equatable, RawRepresentable {
     public var rawValue: String {
         return Self.testPrefix +
             nameApplying(pathComponentTransform: Self.functionEncodedName)
-                .replacingOccurrences(of: ".", with: "\(Self.periodReplacementCharacter)")
+                .replacingOccurrences(of: ".", with: "\(Self.moduleSeparatorPeriodReplacementCharacter)")
     }
 
     /// The fully qualified test function name is the name of the test
@@ -83,7 +83,7 @@ public struct TestFunctionName: Equatable, RawRepresentable {
 
         let value = rawValue[rangeOfPrefix.upperBound...]
 
-        var components = value.split(separator: Self.periodReplacementCharacter)
+        var components = value.split(separator: Self.moduleSeparatorPeriodReplacementCharacter)
 
         guard components.count > 2 else {
             return nil
@@ -130,6 +130,7 @@ public struct TestFunctionName: Equatable, RawRepresentable {
             .replacingOccurrences(of: "{", with: "\(Self.openBraceReplacementCharacter)")
             .replacingOccurrences(of: "}", with: "\(Self.closeBraceReplacementCharacter)")
             .replacingOccurrences(of: " ", with: "\(Self.spaceReplacementCharacter)")
+            .replacingOccurrences(of: ".", with: "\(Self.namePeriodReplacementCharacter)")
     }
 
     internal static func functionDecodedName(from string: String) -> String {
@@ -137,14 +138,17 @@ public struct TestFunctionName: Equatable, RawRepresentable {
             .replacingOccurrences(of: "\(Self.openBraceReplacementCharacter)", with: "{")
             .replacingOccurrences(of: "\(Self.closeBraceReplacementCharacter)", with: "}")
             .replacingOccurrences(of: "\(Self.spaceReplacementCharacter)", with: " ")
+            .replacingOccurrences(of: "\(Self.namePeriodReplacementCharacter)", with: ".")
     }
 
-    /// For swift names, we remove braces, escape reserved words, and convert spaces to underscores.
+    /// For swift names, we remove braces, escape reserved words, and convert
+    /// spaces and periods to underscores.
     public static func swiftName(from string: String) -> String {
         let name = string
             .replacingOccurrences(of: "{", with: "")
             .replacingOccurrences(of: "}", with: "")
             .replacingOccurrences(of: " ", with: "_")
+            .replacingOccurrences(of: ".", with: "_")
         return Self.escapedKeyword(name)
     }
 
@@ -160,7 +164,8 @@ public struct TestFunctionName: Equatable, RawRepresentable {
     private static var openBraceReplacementCharacter: Character = "➊"
     private static var closeBraceReplacementCharacter: Character = "➋"
     private static var spaceReplacementCharacter: Character = "➌"
-    private static var periodReplacementCharacter: Character = "➍"
+    private static var moduleSeparatorPeriodReplacementCharacter: Character = "➍"
+    private static var namePeriodReplacementCharacter: Character = "❺"
     // ➎ taken by `TestFunctionLocalContext.prefixSeparatorCharacter`.
 }
 
diff --git a/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift b/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
index fb11533..ebb74b9 100644
--- a/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
+++ b/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
@@ -85,12 +85,35 @@ final class TestFunctionNameTests: XCTestCase {
 
         assertReflexiveRawValue(
             TestFunctionName(
-                path: .init(["go", "continue", "do", "accept"]),
+                path: .init(["go", "_", "continue", "do", "try", "accept"]),
                 endpoint: .post,
                 direction: .request,
                 context: TestFunctionLocalContext(functionName: "_hello_world➎")!
             )
         )
+
+        assertReflexiveRawValue(
+            TestFunctionName(
+                path: .init(["hello.world", "hi"]),
+                endpoint: .post,
+                direction: .request,
+                context: TestFunctionLocalContext(functionName: "_hello_world➎")!
+            )
+        )
+    }
+
+    func test_periodInPath() {
+        let t1 = TestFunctionName(
+            path: .init(["hello.world", "hi"]),
+            endpoint: .post,
+            direction: .request,
+            context: TestFunctionLocalContext(functionName: "_hello_world➎")!
+        )
+        XCTAssertEqual(t1.fullyQualifiedTestFunctionName, "hello_world.hi.POST.Request._hello_world➎")
+        XCTAssertEqual(t1.rawValue, "test__hello❺world➍hi➍POST➍Request➍_hello_world➎")
+        XCTAssertEqual(t1.testName, "_hello_world➎")
+
+        XCTAssertEqual(TestFunctionName(rawValue: t1.rawValue)?.path, .init(["hello.world", "hi"]))
     }
 
     func test_reservedWordsInPath() {