Fix breaking change with InterfaceDirRelative

An attempt to fix a breaking change between v2 and v3 with InterfaceDirRelative
inadvertently caused another breaking change with existing v3 users. Tests
have been added that assert both cases are sane and work properly.

Related to #1133.

Author: LandonTClipp

.mockery_testify.yml

@@ -142,5 +142,13 @@ packages:
   github.com/vektra/mockery/v3/internal/fixtures/constraint_ifaces:
   github.com/vektra/mockery/v3/internal/fixtures/interface_dir_relative:
     config:
-      dir: '{{.InterfaceDir}}/{{  replaceAll "internal/" "" (index (splitAfterN "/" 2 .InterfaceDirRelative) 0) }}/mocks/{{index (splitAfterN "/" 2 .InterfaceDirRelative) 1}}'
-      filename: "mocks_{{.InterfaceName}}.go"
+      filename: mocks.go
+    interfaces:
+      Foo:
+        configs:
+          # This first option simply asserts that InterfaceDirRelative is an actual path. https://github.com/vektra/mockery/issues/1133
+          - dir: '{{.InterfaceDir}}/{{  replaceAll "internal/" "" (index (splitAfterN "/" 2 .InterfaceDirRelative) 0) }}/mocks/{{index (splitAfterN "/" 2 .InterfaceDirRelative) 1}}'
+          # The second option asserts that the value itself is sane. https://github.com/vektra/mockery/issues/1133#issuecomment-3758283921
+          # This mock will be explicitly tested against so that we can assert in tests that the value
+          # does not encounter breaking changes.
+          - dir: '{{.InterfaceDir}}/{{.InterfaceDirRelative}}'

config/config.go

@@ -653,13 +653,7 @@ func (c *Config) ParseTemplates(
 	workingDir = filepath.ToSlash(workingDir)
 	ifaceFilePath = filepath.ToSlash(filepath.Clean(ifaceFilePath))
 	interfaceDirPath := filepath.ToSlash(filepath.Dir(ifaceFilePath))
-	configPathAbs, err := filepath.Abs(*c.ConfigFile)
-	if err != nil {
-		return fmt.Errorf("getting absolute path of config file: %w", err)
-	}
-	configPathDir := filepath.ToSlash(filepath.Dir(configPathAbs))
-
-	interfaceDirRelativePath, err := filepath.Rel(filepath.FromSlash(configPathDir), filepath.FromSlash(interfaceDirPath))
+	interfaceDirRelativePath, err := filepath.Rel(filepath.FromSlash(workingDir), filepath.FromSlash(interfaceDirPath))
 
 	var interfaceDirRelative string
 

internal/fixtures/interface_dir_relative/interface_test.go

@@ -3,7 +3,7 @@ package interfacedirrelative
 import (
 	"testing"
 
-	mocks "github.com/vektra/mockery/v3/internal/fixtures/interface_dir_relative/mocks/fixtures/interface_dir_relative"
+	mocks "github.com/vektra/mockery/v3/internal/fixtures/interface_dir_relative/internal/fixtures/interface_dir_relative"
 )
 
 func TestFoo(t *testing.T) {