add basic test

cmd/go-mockgen/main.go

@@ -62,7 +62,9 @@ func mainErr() error {
 			stdlibRoot = packageOpts.StdlibRoot
 
 			importpath := packageOpts.ImportPaths[0]
-			importpathToSourcefiles[importpath] = append(importpathToSourcefiles[importpath], packageOpts.SourceFiles...)
+			if len(packageOpts.SourceFiles) > 0 {
+				importpathToSourcefiles[importpath] = append(importpathToSourcefiles[importpath], packageOpts.SourceFiles...)
+			}
 
 			for _, archive := range packageOpts.Archives {
 				a, err := parseArchive(archive)

internal/integration-gcexportdata/.gitignore

@@ -0,0 +1,2 @@
+mock_test.go
+*.a

internal/integration-gcexportdata/gen.go

@@ -0,0 +1,5 @@
+package integrationgcexportdata
+
+//go:generate go build -o sampletext.a .
+//go:generate go build -o require.a ../../testutil/require
+//go:generate go run ../../cmd/go-mockgen

internal/integration-gcexportdata/mockgen.yaml

@@ -0,0 +1,16 @@
+force: true
+disable-formatting: true
+mocks:
+  - filename: mock_test.go
+    package: integrationgcexportdata
+    interfaces:
+      - Banana
+    path: github.com/derision-test/go-mockgen/internal/integration-gcexportdata
+    source-files:
+      - sampletext.go
+    archives:
+      # need to include sources for this as its a direct dependency
+      # (a package from which we're generating mocks)
+      - github.com/derision-test/go-mockgen/internal/integration-gcexportdata=sampletext.a
+      # don't need to include sources for this, as its an indirect dependency
+      - github.com/derision-test/go-mockgen/testutil/require=require.a 

internal/integration-gcexportdata/sampletext.go

@@ -0,0 +1,7 @@
+package integrationgcexportdata
+
+import mockrequire "github.com/derision-test/go-mockgen/testutil/require"
+
+type Banana interface {
+	DoSomething() mockrequire.CallInstanceAsserter
+}

internal/mockgen/generation/generate.go

@@ -96,7 +96,7 @@ func generateDirectory(ifaces []*types.Interface, opts *Options) error {
 		}
 
 		filename := fmt.Sprintf("%s%s%s.go", prefix, iface.Name, suffix)
-		return path.Join(opts.OutputOptions.OutputDir, strings.Replace(strings.ToLower(filename), "-", "_", -1))
+		return path.Join(opts.OutputOptions.OutputDir, strings.ReplaceAll(strings.ToLower(filename), "-", "_"))
 	}
 
 	if !opts.OutputOptions.Force {