jsx-max-props-per-line: Add additional test cases

Make sure it works when a prop is on the same line as the start line of
the tag, as well as with spread props that spans multiple lines.

Author: kentor

tests/lib/rules/jsx-max-props-per-line.js

@@ -38,6 +38,10 @@ ruleTester.run('jsx-max-props-per-line', rule, {
     code: '<App foo bar />',
     options: [{when: 'multiline'}],
     parserOptions: parserOptions
+  }, {
+    code: '<App foo {...this.props} />',
+    options: [{when: 'multiline'}],
+    parserOptions: parserOptions
   }, {
     code: '<App foo bar baz />',
     options: [{maximum: 2, when: 'multiline'}],
@@ -109,6 +113,46 @@ ruleTester.run('jsx-max-props-per-line', rule, {
     ].join('\n'),
     errors: [{message: 'Prop `bar` must be placed on a new line'}],
     parserOptions: parserOptions
+  }, {
+    code: [
+      '<App foo={{',
+      '}} bar />'
+    ].join('\n'),
+    errors: [{message: 'Prop `bar` must be placed on a new line'}],
+    parserOptions: parserOptions
+  }, {
+    code: [
+      '<App foo bar={{',
+      '}} baz />'
+    ].join('\n'),
+    options: [{maximum: 2}],
+    errors: [{message: 'Prop `baz` must be placed on a new line'}],
+    parserOptions: parserOptions
+  }, {
+    code: [
+      '<App foo={{',
+      '}} {...rest} />'
+    ].join('\n'),
+    errors: [{message: 'Prop `rest` must be placed on a new line'}],
+    parserOptions: parserOptions
+  }, {
+    code: [
+      '<App {',
+      '  ...this.props',
+      '} bar />'
+    ].join('\n'),
+    errors: [{message: 'Prop `bar` must be placed on a new line'}],
+    parserOptions: parserOptions
+  }, {
+    code: [
+      '<App {',
+      '  ...this.props',
+      '} {',
+      '  ...rest',
+      '} />'
+    ].join('\n'),
+    errors: [{message: 'Prop `rest` must be placed on a new line'}],
+    parserOptions: parserOptions
   }, {
     code: [
       '<App',