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diff --git a/addons/gdUnit4/src/GdUnitGodotErrorAssert.gd b/addons/gdUnit4/src/GdUnitGodotErrorAssert.gd
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+## An assertion tool to verify for Godot runtime errors like assert() and push notifications like push_error().
+@abstract class_name GdUnitGodotErrorAssert
+extends GdUnitAssert
+
+
+## Verifies that the current value is null.
+@abstract func is_null() -> GdUnitGodotErrorAssert
+
+
+## Verifies that the current value is not null.
+@abstract func is_not_null() -> GdUnitGodotErrorAssert
+
+
+## Verifies that the current value is equal to the given one.
+@abstract func is_equal(expected: Variant) -> GdUnitGodotErrorAssert
+
+
+## Verifies that the current value is not equal to expected one.
+@abstract func is_not_equal(expected: Variant) -> GdUnitGodotErrorAssert
+
+
+## Overrides the default failure message by given custom message.
+@abstract func override_failure_message(message: String) -> GdUnitGodotErrorAssert
+
+
+## Appends a custom message to the failure message.
+@abstract func append_failure_message(message: String) -> GdUnitGodotErrorAssert
+
+
+## Verifies if the executed code runs without any runtime errors
+## Usage:
+##     [codeblock]
+##		await assert_error(<callable>).is_success()
+##     [/codeblock]
+@abstract func is_success() -> GdUnitGodotErrorAssert
+
+
+## Verifies if the executed code runs into a runtime error
+## Usage:
+##     [codeblock]
+##		await assert_error(<callable>).is_runtime_error(<expected error message>)
+##     [/codeblock]
+@abstract func is_runtime_error(expected_error: Variant) -> GdUnitGodotErrorAssert
+
+
+## Verifies if the executed code has a push_warning() used
+## Usage:
+##     [codeblock]
+##		await assert_error(<callable>).is_push_warning(<expected push warning message>)
+##     [/codeblock]
+@abstract func is_push_warning(expected_warning: Variant) -> GdUnitGodotErrorAssert
+
+
+## Verifies if the executed code has a push_error() used
+## Usage:
+##     [codeblock]
+##		await assert_error(<callable>).is_push_error(<expected push error message>)
+##     [/codeblock]
+@abstract func is_push_error(expected_error: Variant) -> GdUnitGodotErrorAssert