tests: add configuration tests

Author: ldez

pkg/golinters/fatcontext/testdata/fatcontext_structpointer.go

@@ -0,0 +1,25 @@
+//golangcitest:args -Efatcontext
+//golangcitest:config_path testdata/fatcontext_structpointer.yml
+package testdata
+
+import (
+	"context"
+)
+
+type Container struct {
+	Ctx context.Context
+}
+
+func something() func(*Container) {
+	return func(r *Container) {
+		ctx := r.Ctx
+		ctx = context.WithValue(ctx, "key", "val")
+		r.Ctx = ctx // want "potential nested context in struct pointer"
+	}
+}
+
+func blah(r *Container) {
+	ctx := r.Ctx
+	ctx = context.WithValue(ctx, "key", "val")
+	r.Ctx = ctx // want "potential nested context in struct pointer"
+}

pkg/golinters/fatcontext/testdata/fatcontext_structpointer.yml

@@ -0,0 +1,4 @@
+linters-settings:
+  fatcontext:
+    check-struct-pointers: true
+