src/main/java/org/fest/assertions/internal/Strings.java
public void assertStartsWith(@Nullable Description description, @Nullable String actual, @Nonnull String prefix) {
    checkNotNull(prefix);
    assertNotNull(description, actual);
    if (!actual.startsWith(prefix)) {
      throw failures.failure(description, shouldStartWith(actual, prefix));
    }
  }
public void assertStartsWith(@Nullable Description description, @Nullable String actual, @Nonnull String prefix) {
    checkNotNull(prefix);
    assertNotNull(description, actual);
    if (!actual.startsWith(prefix)) {
      throw failures.failure(description, shouldStartWith(actual, prefix));
    }
  }
Verifies that the <em>actual</em> {@code String} starts with the given prefix.

@param description the description of the <em>actual</em> {@code String}.
@param actual the <em>actual</em> {@code String}.
@param prefix the given prefix.
@throws NullPointerException if the given sequence is {@code null}.
@throws AssertionError if the <em>actual</em> {@code String} is {@code null}.
@throws AssertionError if the <em>actual</em> {@code String} does not start with the given prefix.