Improve assertGenericTypeAnnotationHasExactlyOneTypeParameter tests (#…

…34942)

Summary:
#34933 has been merged just after I pushed a new commit to the branch to improve tests of `assertGenericTypeAnnotationHasExactlyOneTypeParameter` function, but the last commit was not imported to the internal repository.

The `assertGenericTypeAnnotationHasExactlyOneTypeParameter` can throw different types of Error, and I believe that `.toThrow(Error)` is not specific enough. So I replaced it with `toThrowErrorMatchingInlineSnapshot()`.

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[Internal] [Changed] - Improve assertGenericTypeAnnotationHasExactlyOneTypeParameter tests in parsers-commons

Pull Request resolved: #34942

Test Plan: Some test cases were ok because the assertGenericTypeAnnotationHasExactlyOneTypeParameter function threw an Error, but for the wrong reason. I've made sure that the error displayed in the inline snapshot is the one we expect.

Reviewed By: cortinico

Differential Revision: D40384993

Pulled By: cipolleschi

fbshipit-source-id: aaa943be1e808af2c5131f7d06baf24bc3bffa31

packages/react-native-codegen/src/parsers/__tests__/parsers-commons-test.js

@@ -11,7 +11,6 @@
 
 'use-strict';
 
-import {IncorrectlyParameterizedGenericParserError} from '../errors';
 import {assertGenericTypeAnnotationHasExactlyOneTypeParameter} from '../parsers-commons';
 
 const {
@@ -87,8 +86,25 @@ describe('unwrapNullable', () => {
 });
 
 describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
+  const moduleName = 'testModuleName';
+
+  it("doesn't throw any Error when typeAnnotation has exactly one typeParameter", () => {
+    const typeAnnotation = {
+      typeParameters: {
+        type: 'TypeParameterInstantiation',
+        params: [1],
+      },
+    };
+    expect(() =>
+      assertGenericTypeAnnotationHasExactlyOneTypeParameter(
+        moduleName,
+        typeAnnotation,
+        'Flow',
+      ),
+    ).not.toThrow();
+  });
+
   it('throws an IncorrectlyParameterizedGenericParserError if typeParameters is null', () => {
-    const moduleName = 'testModuleName';
     const typeAnnotation = {
       typeParameters: null,
       id: {
@@ -101,14 +117,16 @@ describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
         typeAnnotation,
         'Flow',
       ),
-    ).toThrow(IncorrectlyParameterizedGenericParserError);
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"Module testModuleName: Generic 'typeAnnotationName' must have type parameters."`,
+    );
   });
 
-  it("throws an error if typeAnnotation.typeParameters.type doesn't have the correct value depending on language", () => {
-    const moduleName = 'testModuleName';
+  it('throws an error if typeAnnotation.typeParameters.type is not TypeParameterInstantiation when language is Flow', () => {
     const flowTypeAnnotation = {
       typeParameters: {
-        type: 'TypeParameterInstantiation',
+        type: 'wrongType',
+        params: [1],
       },
       id: {
         name: 'typeAnnotationName',
@@ -120,11 +138,16 @@ describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
         flowTypeAnnotation,
         'Flow',
       ),
-    ).toThrow(Error);
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"assertGenericTypeAnnotationHasExactlyOneTypeParameter: Type parameters must be an AST node of type 'TypeParameterInstantiation'"`,
+    );
+  });
 
+  it('throws an error if typeAnnotation.typeParameters.type is not TSTypeParameterInstantiation when language is TypeScript', () => {
     const typeScriptTypeAnnotation = {
       typeParameters: {
-        type: 'TypeParameterInstantiation',
+        type: 'wrongType',
+        params: [1],
       },
       typeName: {
         name: 'typeAnnotationName',
@@ -136,11 +159,12 @@ describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
         typeScriptTypeAnnotation,
         'TypeScript',
       ),
-    ).toThrow(Error);
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"assertGenericTypeAnnotationHasExactlyOneTypeParameter: Type parameters must be an AST node of type 'TSTypeParameterInstantiation'"`,
+    );
   });
 
   it("throws an IncorrectlyParameterizedGenericParserError if typeParameters don't have 1 exactly parameter", () => {
-    const moduleName = 'testModuleName';
     const typeAnnotationWithTwoParams = {
       typeParameters: {
         params: [1, 2],
@@ -156,7 +180,9 @@ describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
         typeAnnotationWithTwoParams,
         'Flow',
       ),
-    ).toThrow(IncorrectlyParameterizedGenericParserError);
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"Module testModuleName: Generic 'typeAnnotationName' must have exactly one type parameter."`,
+    );
 
     const typeAnnotationWithNoParams = {
       typeParameters: {
@@ -173,7 +199,9 @@ describe('assertGenericTypeAnnotationHasExactlyOneTypeParameter', () => {
         typeAnnotationWithNoParams,
         'Flow',
       ),
-    ).toThrow(IncorrectlyParameterizedGenericParserError);
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"Module testModuleName: Generic 'typeAnnotationName' must have exactly one type parameter."`,
+    );
   });
 });