Add event emitted matcher negation support (#181)

TrueFiEng · Jan 15, 2020 · 7c4d835 · 7c4d835
1 parent 68e9c8a
commit 7c4d835
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Showing 2 changed files with 16 additions and 9 deletions.
diff --git a/waffle-chai/src/matchers.ts b/waffle-chai/src/matchers.ts
@@ -96,13 +96,10 @@ export const waffleChai = (chai: any, chaiUtils: any) => {
 
       const {topic} = eventDescription;
       this.logs = filterLogsWithTopics(receipt.logs, topic);
-      if (this.logs.length < 1) {
-        this.assert(false,
-          `Expected event "${eventName}" to emitted, but wasn't`,
-          `Expected event "${eventName}" NOT to emitted, but it was`,
-          eventName,
-          '');
-      }
+      this.assert(this.logs.length > 0,
+        `Expected event "${eventName}" to be emitted, but it wasn't`,
+        `Expected event "${eventName}" NOT to be emitted, but it was`
+      );
     });
     this.then = derivedPromise.then.bind(derivedPromise);
     this.catch = derivedPromise.catch.bind(derivedPromise);

diff --git a/waffle-chai/test/events.ts b/waffle-chai/test/events.ts
@@ -19,7 +19,7 @@ describe('INTEGRATION: Events', () => {
   it('Emit one: fail', async () => {
     await expect(
       expect(events.emitOne()).to.emit(events, 'Two')
-    ).to.be.eventually.rejectedWith(AssertionError, 'Expected event "Two" to emitted, but wasn\'t');
+    ).to.be.eventually.rejectedWith(AssertionError, 'Expected event "Two" to be emitted, but it wasn\'t');
   });
 
   it('Emit two: success', async () => {
@@ -29,7 +29,17 @@ describe('INTEGRATION: Events', () => {
   it('Emit two: fail', async () => {
     await expect(
       expect(events.emitTwo()).to.emit(events, 'One')
-    ).to.be.eventually.rejectedWith(AssertionError, 'Expected event "One" to emitted, but wasn\'t');
+    ).to.be.eventually.rejectedWith(AssertionError, 'Expected event "One" to be emitted, but it wasn\'t');
+  });
+
+  it('Do not emit one: fail', async () => {
+    await expect(
+      expect(events.emitOne()).to.not.emit(events, 'One')
+    ).to.be.eventually.rejectedWith(AssertionError, 'Expected event "One" NOT to be emitted, but it was');
+  });
+
+  it('Do not emit two: success', async () => {
+    await expect(events.emitTwo()).to.not.emit(events, 'One');
   });
 
   it('Emit unexistent event: fail', async () => {