fix(cargo): handle * getNewValue

lib/versioning/cargo/index.spec.ts

@@ -103,6 +103,24 @@ describe('semver.isSingleVersion()', () => {
   });
 });
 describe('semver.getNewValue()', () => {
+  it('returns if empty or *', () => {
+    expect(
+      semver.getNewValue({
+        currentValue: null,
+        rangeStrategy: 'bump',
+        fromVersion: '1.0.0',
+        toVersion: '1.1.0',
+      })
+    ).toEqual(null);
+    expect(
+      semver.getNewValue({
+        currentValue: '*',
+        rangeStrategy: 'bump',
+        fromVersion: '1.0.0',
+        toVersion: '1.1.0',
+      })
+    ).toEqual('*');
+  });
   it('bumps equals', () => {
     expect(
       semver.getNewValue({

lib/versioning/cargo/index.ts

@@ -1,5 +1,6 @@
 import { api as npm } from '../npm';
 import { VersioningApi, NewValueConfig } from '../common';
+import { logger } from '../../logger';
 
 export const id = 'cargo';
 export const displayName = 'Cargo';
@@ -33,6 +34,10 @@ function notEmpty(s: string): boolean {
 }
 
 function npm2cargo(input: string): string {
+  // istanbul ignore if
+  if (!input) {
+    return input;
+  }
   // Note: this doesn't remove the ^
   const res = input
     .split(' ')
@@ -73,6 +78,9 @@ function getNewValue({
   fromVersion,
   toVersion,
 }: NewValueConfig): string {
+  if (!currentValue || currentValue === '*') {
+    return currentValue;
+  }
   if (rangeStrategy === 'pin' || isSingleVersion(currentValue)) {
     let res = '=';
     if (currentValue.startsWith('= ')) {
@@ -88,6 +96,14 @@ function getNewValue({
     toVersion,
   });
   let newCargo = npm2cargo(newSemver);
+  // istanbul ignore if
+  if (!newCargo) {
+    logger.info(
+      { currentValue, newSemver },
+      'Could not get cargo version from semver'
+    );
+    return currentValue;
+  }
   // Try to reverse any caret we added
   if (newCargo.startsWith('^') && !currentValue.startsWith('^')) {
     newCargo = newCargo.substring(1);