Compiler flag oneof=unions generates type unions for oneof fields ins…

…tead of individual properties (#95)

Addresses #74

integration/oneof-properties/oneof-properties-test.ts

@@ -0,0 +1,157 @@
+import { oneof as pbjs } from './pbjs';
+import { PleaseChoose } from './oneof'
+
+describe('oneof=properties (default)', () => {
+  it('generates types correctly', () => {
+    const alice: PleaseChoose = {
+      name: 'Alice',
+      age: 42,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: undefined,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: undefined,
+      thirdOption: undefined,
+    };
+    const bob: PleaseChoose = {
+      name: 'Bob',
+      age: 42,
+      aNumber: 132,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: undefined,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: undefined,
+      thirdOption: undefined,
+    };
+  });
+
+  it('decode', () => {
+    let encoded = pbjs.PleaseChoose.encode(new pbjs.PleaseChoose({
+      name: 'Debbie',
+      aBool: true,
+      age: 37,
+      or: 'perhaps not',
+    })).finish();
+    let decoded = PleaseChoose.decode(encoded);
+    expect(decoded).toEqual({
+      name: 'Debbie',
+      age: 37,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: true,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: 'perhaps not',
+      thirdOption: undefined,
+    });
+  });
+
+  it('encode', () => {
+    let encoded = PleaseChoose.encode({
+      name: 'Debbie',
+      age: 37,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: true,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: 'perhaps not',
+      thirdOption: undefined,
+    }).finish();
+    let decoded =  pbjs.PleaseChoose.decode(encoded);
+    expect(decoded).toEqual({
+      name: 'Debbie',
+      aBool: true,
+      age: 37,
+      or: 'perhaps not',
+    });
+  });
+
+  it('fromPartial', () => {
+    let empty = PleaseChoose.fromPartial({})
+    expect(empty).toEqual({
+      name: '',
+      age: 0,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: undefined,
+      either: undefined,
+      or: undefined,
+      thirdOption: undefined,
+    });
+
+    let partial = PleaseChoose.fromPartial({
+      name: 'Debbie',
+      aBool: true,
+      age: 37,
+      or: 'perhaps not',
+    });
+    expect(partial).toEqual({
+      name: 'Debbie',
+      age: 37,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: true,
+      either: undefined,
+      or: 'perhaps not',
+      thirdOption: undefined,
+    });
+  });
+
+  it('toJSON', () => {
+    let debbie: PleaseChoose = {
+      name: 'Debbie',
+      age: 37,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: true,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: 'perhaps not',
+      thirdOption: undefined,
+    };
+    let pbjsJson = pbjs.PleaseChoose.decode(PleaseChoose.encode(debbie).finish()).toJSON();
+    let json = PleaseChoose.toJSON(debbie);
+    expect(json).toEqual(pbjsJson);
+  });
+
+  it('fromJSON', () => {
+    let empty = PleaseChoose.fromJSON({})
+    expect(empty).toEqual({
+      name: '',
+      age: 0,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: undefined,
+      either: undefined,
+      or: undefined,
+      thirdOption: undefined,
+    })
+
+    let debbie: PleaseChoose = {
+      name: 'Debbie',
+      age: 37,
+      aNumber: undefined,
+      aString: undefined,
+      aMessage: undefined,
+      aBool: true,
+      bunchaBytes: undefined,
+      either: undefined,
+      or: 'perhaps not',
+      thirdOption: undefined,
+    };
+    let pbjsJson = pbjs.PleaseChoose.decode(PleaseChoose.encode(debbie).finish()).toJSON();
+    let fromJson = PleaseChoose.fromJSON(pbjsJson)
+    expect(fromJson).toEqual(debbie)
+  });
+});

integration/oneof-properties/oneof.proto

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+syntax = "proto3";
+package oneof;
+
+message PleaseChoose {
+
+  string name = 1;
+
+  message Submessage {
+    string name = 1;
+  }
+
+  // Please to be choosing one of the fields within this oneof clause.
+  // This text exists to ensure we transpose comments correctly.
+  oneof choice {
+
+    // Use this if you want a number. Numbers are great. Who doesn't
+    // like them?
+    double a_number = 2;
+
+    // Use this if you want a string. Strings are also nice. Not as
+    // nice as numbers, but what are you going to do...
+    string a_string = 3;
+
+    Submessage a_message = 4;
+
+    // We also added a bool option! This was added after the 'age'
+    // field, so it has a higher number.
+    bool a_bool = 6;
+
+    bytes buncha_bytes = 10;
+  }
+
+  uint32 age = 5;
+
+  oneof either_or {
+    string either = 7;
+    string or = 8;
+    string third_option = 9;
+  }
+
+}