This adds a test to bug 508 (#516)

* This adds a test to bug 508

It fails against master before merging the patch on #509 (review)

Author: perrito666

mage/main_test.go

@@ -1877,6 +1877,28 @@ func TestWrongDependency(t *testing.T) {
 	}
 }
 
+// Regression tests, add tests to ensure we do not regress on known issues.
+
+// TestBug508 is a regression test for: Bug: using Default with imports selects first matching func by name
+func TestBug508(t *testing.T) {
+	stdout := &bytes.Buffer{}
+	stderr := &bytes.Buffer{}
+	inv := Invocation{
+		Dir:    "./testdata/bug508",
+		Stderr: stderr,
+		Stdout: stdout,
+	}
+	code := Invoke(inv)
+	if code != 0 {
+		t.Log(stderr.String())
+		t.Fatalf("expected 0, but got %v", code)
+	}
+	expected := "test\n"
+	if stdout.String() != expected {
+		t.Fatalf("expected %q, but got %q", expected, stdout.String())
+	}
+}
+
 // / This code liberally borrowed from https://github.com/rsc/goversion/blob/master/version/exe.go
 
 type (

mage/testdata/bug508/deps/ambiguousimports.go

@@ -0,0 +1,20 @@
+package deps
+
+import (
+	"fmt"
+
+	"github.com/magefile/mage/mg"
+)
+
+// All code in this package belongs to @na4ma4 in GitHub https://github.com/na4ma4/magefile-test-import
+// reproduced here for ease of testing regression on bug 508
+
+type Docker mg.Namespace
+
+func (Docker) Test() {
+	fmt.Println("docker")
+}
+
+func Test() {
+	fmt.Println("test")
+}

mage/testdata/bug508/magefile.go

@@ -0,0 +1,11 @@
+//go:build mage
+// +build mage
+
+package main
+
+import (
+	//mage:import
+	"github.com/magefile/mage/mage/testdata/bug508/deps"
+)
+
+var Default = deps.Test