Add extra test case

Author: Andarist

tests/baselines/reference/strictOptionalPropertiesOmittedExpressions1.symbols

@@ -0,0 +1,20 @@
+//// [tests/cases/compiler/strictOptionalPropertiesOmittedExpressions1.ts] ////
+
+=== strictOptionalPropertiesOmittedExpressions1.ts ===
+function test1(arg: [number, undefined, string]) {}
+>test1 : Symbol(test1, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 0, 0))
+>arg : Symbol(arg, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 0, 15))
+
+test1([10, , "foo"]); // ok
+>test1 : Symbol(test1, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 0, 0))
+
+const test2 = ["foo", ,] as const;
+>test2 : Symbol(test2, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 3, 5))
+>const : Symbol(const)
+
+const length2 = test2.length; // 2
+>length2 : Symbol(length2, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 4, 5))
+>test2.length : Symbol(length)
+>test2 : Symbol(test2, Decl(strictOptionalPropertiesOmittedExpressions1.ts, 3, 5))
+>length : Symbol(length)
+

tests/baselines/reference/strictOptionalPropertiesOmittedExpressions1.types

@@ -0,0 +1,28 @@
+//// [tests/cases/compiler/strictOptionalPropertiesOmittedExpressions1.ts] ////
+
+=== strictOptionalPropertiesOmittedExpressions1.ts ===
+function test1(arg: [number, undefined, string]) {}
+>test1 : (arg: [number, undefined, string]) => void
+>arg : [number, undefined, string]
+
+test1([10, , "foo"]); // ok
+>test1([10, , "foo"]) : void
+>test1 : (arg: [number, undefined, string]) => void
+>[10, , "foo"] : [number, undefined, string]
+>10 : 10
+> : undefined
+>"foo" : "foo"
+
+const test2 = ["foo", ,] as const;
+>test2 : readonly ["foo", undefined]
+>["foo", ,] as const : readonly ["foo", undefined]
+>["foo", ,] : readonly ["foo", undefined]
+>"foo" : "foo"
+> : undefined
+
+const length2 = test2.length; // 2
+>length2 : 2
+>test2.length : 2
+>test2 : readonly ["foo", undefined]
+>length : 2
+

tests/cases/compiler/strictOptionalPropertiesOmittedExpressions1.ts

@@ -0,0 +1,9 @@
+// @strict: true
+// @exactOptionalPropertyTypes: true
+// @noEmit: true
+
+function test1(arg: [number, undefined, string]) {}
+test1([10, , "foo"]); // ok
+
+const test2 = ["foo", ,] as const;
+const length2 = test2.length; // 2