Add source path argument to testLockState

The new test pattern is to chdir into a temp location for the test, but
the prevents us from locating the testdata directory in the source. Add
a source path to testLockState so we can find the statelocker.go source.

command/apply_destroy_test.go

@@ -111,7 +111,7 @@ func TestApply_destroyLockedState(t *testing.T) {
 
 	statePath := testStateFile(t, originalState)
 
-	unlock, err := testLockState(statePath)
+	unlock, err := testLockState("./testdata", statePath)
 	if err != nil {
 		t.Fatal(err)
 	}

command/apply_test.go

@@ -63,7 +63,7 @@ func TestApply(t *testing.T) {
 func TestApply_lockedState(t *testing.T) {
 	statePath := testTempFile(t)
 
-	unlock, err := testLockState(statePath)
+	unlock, err := testLockState("./testdata", statePath)
 	if err != nil {
 		t.Fatal(err)
 	}

command/command_test.go

@@ -535,7 +535,9 @@ func testRemoteState(t *testing.T, s *terraform.State, c int) (*terraform.Remote
 
 // testlockState calls a separate process to the lock the state file at path.
 // deferFunc should be called in the caller to properly unlock the file.
-func testLockState(path string) (func(), error) {
+// Since many tests change the working durectory, the sourcedir argument must be
+// supplied to locate the statelocker.go source.
+func testLockState(sourceDir, path string) (func(), error) {
 	// build and run the binary ourselves so we can quickly terminate it for cleanup
 	buildDir, err := ioutil.TempDir("", "locker")
 	if err != nil {
@@ -545,8 +547,10 @@ func testLockState(path string) (func(), error) {
 		os.RemoveAll(buildDir)
 	}
 
+	source := filepath.Join(sourceDir, "statelocker.go")
 	lockBin := filepath.Join(buildDir, "statelocker")
-	out, err := exec.Command("go", "build", "-o", lockBin, "testdata/statelocker.go").CombinedOutput()
+
+	out, err := exec.Command("go", "build", "-o", lockBin, source).CombinedOutput()
 	if err != nil {
 		cleanFunc()
 		return nil, fmt.Errorf("%s %s", err, out)

command/plan_test.go

@@ -46,7 +46,7 @@ func TestPlan_lockedState(t *testing.T) {
 	}
 
 	testPath := testFixturePath("plan")
-	unlock, err := testLockState(filepath.Join(testPath, DefaultStateFilename))
+	unlock, err := testLockState("./testdata", filepath.Join(testPath, DefaultStateFilename))
 	if err != nil {
 		t.Fatal(err)
 	}

command/refresh_test.go

@@ -63,7 +63,7 @@ func TestRefresh_lockedState(t *testing.T) {
 	state := testState()
 	statePath := testStateFile(t, state)
 
-	unlock, err := testLockState(statePath)
+	unlock, err := testLockState("./testdata", statePath)
 	if err != nil {
 		t.Fatal(err)
 	}

command/taint_test.go

@@ -63,7 +63,7 @@ func TestTaint_lockedState(t *testing.T) {
 	}
 	statePath := testStateFile(t, state)
 
-	unlock, err := testLockState(statePath)
+	unlock, err := testLockState("./testdata", statePath)
 	if err != nil {
 		t.Fatal(err)
 	}

command/untaint_test.go

@@ -68,7 +68,7 @@ func TestUntaint_lockedState(t *testing.T) {
 		},
 	}
 	statePath := testStateFile(t, state)
-	unlock, err := testLockState(statePath)
+	unlock, err := testLockState("./testdata", statePath)
 	if err != nil {
 		t.Fatal(err)
 	}