test(postgres): add test for update fallback to read

- Adds a test for the `update` method's edge case where no updatable fields are provided.
- Verifies that the client correctly calls the `read` method as a fallback, preventing an empty SQL UPDATE statement.

Author: fulleni

coverage/lcov.info

@@ -51,9 +51,9 @@ DA:137,4
 DA:138,1
 DA:140,4
 DA:141,1
-DA:145,0
-DA:154,0
-DA:155,0
+DA:145,1
+DA:154,1
+DA:155,1
 DA:164,1
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@@ -77,7 +77,7 @@ DA:229,2
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-DA:237,0
+DA:237,1
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@@ -87,13 +87,13 @@ DA:249,1
 DA:251,2
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-DA:257,0
-DA:258,0
+DA:257,1
+DA:258,1
 DA:261,4
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-DA:265,0
-DA:266,0
+DA:265,4
+DA:266,1
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@@ -154,5 +154,5 @@ DA:390,2
 DA:391,2
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 LF:154
-LH:120
+LH:128
 end_of_record

test/src/ht_data_postgres_test.dart

@@ -298,6 +298,47 @@ void main() {
           ),
         ).called(1);
       });
+
+      test('should throw NotFoundException if item to update is not found',
+          () {
+        final mockResult = MockResult();
+        when(() => mockResult.isEmpty).thenReturn(true);
+        when(
+          () => mockConnection.execute(
+            any(),
+            parameters: any(named: 'parameters'),
+          ),
+        ).thenAnswer((_) async => mockResult);
+
+        expect(
+          () => sut.update(id: '1', item: testModel),
+          throwsA(isA<NotFoundException>()),
+        );
+      });
+
+      test('should call read when update data is empty', () async {
+        final mockResult = MockResult();
+        final mockResultRow = MockResultRow();
+        when(() => mockResultRow.toColumnMap()).thenReturn(testModelJson);
+        when(() => mockResult.isEmpty).thenReturn(false);
+        when(() => mockResult.first).thenReturn(mockResultRow);
+        when(
+          () => mockConnection.execute(
+            any(),
+            parameters: any(named: 'parameters'),
+          ),
+        ).thenAnswer((_) async => mockResult);
+
+        final mockEmptyModel = MockTestModel();
+        when(() => mockEmptyModel.toJson()).thenReturn({'id': '1'});
+
+        await sut.update(id: '1', item: mockEmptyModel);
+
+        // Verify that read was called by checking for the SELECT statement
+        verify(
+          () => mockLogger.fine(contains('Reading item with id "1"')),
+        ).called(1);
+      });
     });
 
     group('delete', () {