ensure DerivePathInfo is only called once

Author: SimonCropp

src/Verify.Expecto/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, string typeName, string
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.Fixie/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.MSTest/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.NUnit/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.TUnit/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.Xunit/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.

src/Verify.XunitV3/DerivePaths/Verifier.cs

@@ -18,8 +18,11 @@ internal static PathInfo GetPathInfo(string sourceFile, Type type, MethodInfo me
     /// To move to this approach, any existing `.verified.` files will need to be moved to the new directory
     /// </remarks>
     /// <param name="derivePathInfo">Custom callback to control the behavior.</param>
-    public static void DerivePathInfo(DerivePathInfo derivePathInfo) =>
+    public static void DerivePathInfo(DerivePathInfo derivePathInfo)
+    {
+        InnerVerifier.ThrowIfVerifyHasBeenRun();
         Verifier.derivePathInfo = derivePathInfo;
+    }
 
     /// <summary>
     /// Use a directory relative to the project directory for storing for `.verified.` files.