Add test for ts.equalOwnProperties

Author: s0

src/testRunner/tsconfig.json

@@ -46,6 +46,7 @@
         "unittests/cancellableLanguageServiceOperations.ts",
         "unittests/commandLineParsing.ts",
         "unittests/compileOnSave.ts",
+        "unittests/compilerCore.ts",
         "unittests/configurationExtension.ts",
         "unittests/convertCompilerOptionsFromJson.ts",
         "unittests/convertToAsyncFunction.ts",

src/testRunner/unittests/compilerCore.ts

@@ -0,0 +1,33 @@
+namespace ts {
+    describe("compilerCore", () => {
+        describe("equalOwnProperties", () => {
+            it("correctly equates objects", () => {
+                assert.isTrue(equalOwnProperties({}, {}));
+                assert.isTrue(equalOwnProperties({ a: 1 }, { a: 1 }));
+                assert.isTrue(equalOwnProperties({ a: 1, b: 2 }, { b: 2, a: 1 }));
+            });
+            it("correctly identifies unmatched objects", () => {
+                assert.isFalse(equalOwnProperties({}, { a: 1 }), "missing left property");
+                assert.isFalse(equalOwnProperties({ a: 1 }, {}), "missing right property");
+                assert.isFalse(equalOwnProperties({ a: 1 }, { a: 2 }), "differing property");
+            });
+            it("correctly identifies undefined vs hasOwnProperty", () => {
+                assert.isFalse(equalOwnProperties({}, { a: undefined }), "missing left property");
+                assert.isFalse(equalOwnProperties({ a: undefined }, {}), "missing right property");
+            });
+            it("truthiness", () => {
+                const trythyTest = (l: any, r: any) => !!l === !!r;
+                assert.isFalse(equalOwnProperties({}, { a: 1 }, trythyTest), "missing left truthy property");
+                assert.isFalse(equalOwnProperties({}, { a: 0 }, trythyTest), "missing left falsey property");
+                assert.isFalse(equalOwnProperties({ a: 1 }, {}, trythyTest), "missing right truthy property");
+                assert.isFalse(equalOwnProperties({ a: 0 }, {}, trythyTest), "missing right falsey property");
+                assert.isTrue(equalOwnProperties({ a: 1 }, { a: "foo" }, trythyTest), "valid equality");
+            });
+            it("all equal", () => {
+                assert.isFalse(equalOwnProperties({}, { a: 1 }, () => true), "missing left property");
+                assert.isFalse(equalOwnProperties({ a: 1 }, {}, () => true), "missing right property");
+                assert.isTrue(equalOwnProperties({ a: 1 }, { a: 2 }, () => true), "valid equality");
+            });
+        });
+    });
+}