inputFalse test should attempt migration and check error

Make sure the init inputFalse test actually errors from missing input,
since skipping input will still fail later during provider
initialization. We need to make sure there are two different states that
aren't a noop for migration, and reset the command struct for each run.

Also verify that we don't go into an infinite loop if there is no input.

command/init_test.go

@@ -13,6 +13,8 @@ import (
 
 	"github.com/hashicorp/terraform/helper/copy"
 	"github.com/hashicorp/terraform/plugin/discovery"
+	"github.com/hashicorp/terraform/state"
+	"github.com/hashicorp/terraform/terraform"
 	"github.com/mitchellh/cli"
 )
 
@@ -530,10 +532,48 @@ func TestInit_inputFalse(t *testing.T) {
 		t.Fatalf("bad: \n%s", ui.ErrorWriter)
 	}
 
+	// write different states for foo and bar
+	s := terraform.NewState()
+	s.Lineage = "foo"
+	if err := (&state.LocalState{Path: "foo"}).WriteState(s); err != nil {
+		t.Fatal(err)
+	}
+	s.Lineage = "bar"
+	if err := (&state.LocalState{Path: "bar"}).WriteState(s); err != nil {
+		t.Fatal(err)
+	}
+
+	ui = new(cli.MockUi)
+	c = &InitCommand{
+		Meta: Meta{
+			testingOverrides: metaOverridesForProvider(testProvider()),
+			Ui:               ui,
+		},
+	}
+
 	args = []string{"-input=false", "-backend-config=path=bar"}
 	if code := c.Run(args); code == 0 {
 		t.Fatal("init should have failed", ui.OutputWriter)
 	}
+
+	errMsg := ui.ErrorWriter.String()
+	if !strings.Contains(errMsg, "input disabled") {
+		t.Fatal("expected input disabled error, got", errMsg)
+	}
+
+	ui = new(cli.MockUi)
+	c = &InitCommand{
+		Meta: Meta{
+			testingOverrides: metaOverridesForProvider(testProvider()),
+			Ui:               ui,
+		},
+	}
+
+	// A missing input=false should abort rather than loop infinitely
+	args = []string{"-backend-config=path=bar"}
+	if code := c.Run(args); code == 0 {
+		t.Fatal("init should have failed", ui.OutputWriter)
+	}
 }
 
 func TestInit_getProvider(t *testing.T) {