checkFromStringCase("", 88, "", 88, false);
    checkFromStringCase(":", 99, "", 99, false);
    checkFromStringCase(":123", -1, "", 123, true);
    checkFromStringCase("\nOMG\t", 89, "\nOMG\t", 89, false);
  }

  private static void checkFromStringCase(
      String hpString,
      int defaultPort,
      @Nullable String expectHost,
      int expectPort,
      boolean expectHasExplicitPort) {

    checkFromStringCase("", 88, "", 88, false);
    checkFromStringCase(":", 99, "", 99, false);
    checkFromStringCase(":123", -1, "", 123, true);
    checkFromStringCase("\nOMG\t", 89, "\nOMG\t", 89, false);
  }

  public void testFromStringParseableIncompleteAddresses() {
    checkFromStringCase("1.2.3", 87, "1.2.3", 87, false);
    checkFromStringCase("1.2.3:99", 87, "1.2.3", 99, true);

**FastAPI** will take care of solving them.

## First dependency "dependable" { #first-dependency-dependable }

You could create a first dependency ("dependable") like:

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[8:9] *}

It declares an optional query parameter `q` as a `str`, and then it just returns it.

This is quite simple (not very useful), but will help us focus on how the sub-dependencies work.

        C = FF(C, D, A, B, X[14], 11);
        B = FF(B, C, D, A, X[15], 19);

        A = GG(A, B, C, D, X[0], 3);
        D = GG(D, A, B, C, X[4], 5);
        C = GG(C, D, A, B, X[8], 9);
        B = GG(B, C, D, A, X[12], 13);
        A = GG(A, B, C, D, X[1], 3);
        D = GG(D, A, B, C, X[5], 5);
        C = GG(C, D, A, B, X[9], 9);
        B = GG(B, C, D, A, X[13], 13);

        final int start = bufferIndex;
        final int structureSize = SMBUtil.readInt2(buffer, bufferIndex);

        if (structureSize != 89) {
            throw new SMBProtocolDecodingException("Structure size is not 89");
        }

        this.oplockLevel = buffer[bufferIndex + 2];
        this.openFlags = buffer[bufferIndex + 3];
        bufferIndex += 4;

        }

        in 3..4 -> {
          source.readData(data)
        }

        in 5..7 -> {
          data.writeByte('\n'.code) // 'data' on a line of its own.
        }

        in 8..9 -> {
          id = source.readUtf8LineStrict().takeIf { it.isNotEmpty() }
        }

        in 10..12 -> {
          id = null // 'id' on a line of its own.
        }

        in 13..14 -> {

     */
    @Test
    void testWriteParametersWireFormat() {
        // Given
        int sid = 0x1234;
        int resumeKey = 0x89ABCDEF; // LE expected: EF CD AB 89
        String name = "file.txt";
        Trans2FindNext2 next = new Trans2FindNext2(sid, resumeKey, name);

        int expectedLen = 2 + 2 + 2 + 4 + 2 + name.length() + 1;
        byte[] dst = new byte[expectedLen];

```
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            35:ac:60:46:ad:8d:de:18:dc:0b:f6:98:14:ee:89:e8
        Signature Algorithm: ED25519
        Issuer: CN = consoleAdmin
        Validity
            Not Before: Jul 19 15:08:44 2021 GMT
            Not After : Aug 18 15:08:44 2021 GMT
        Subject: CN = consoleAdmin

Let's first focus on the dependency.

It is just a function that can take all the same parameters that a *path operation function* can take:

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[8:9] *}

That's it.

**2 lines**.

And it has the same shape and structure that all your *path operation functions* have.

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