'assertEquals()' between objects of inconvertible types

Reports calls to assertion methods where the "expected" and "actual" arguments are of incompatible types.

Such calls often indicate that there is a bug in the test. This inspection checks the relevant JUnit, TestNG, and AssertJ methods.

Examples:

  assertEquals("1", 1);
  assertNotSame(new int[0], 0);

  // weak warning, may just test the equals() contract
  assertThat(foo).as("user type").isNotEqualTo(bar);

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

AssertBetweenInconvertibleTypes

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Inspection ID: AssertBetweenInconvertibleTypes

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection AssertBetweenInconvertibleTypes

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025